Image upscaling tools compared

Tested scale: 4×

Signs and fine lines were clear in this 4× output; other images need separate tests.

PSNR=27.42dB · SSIM=0.8918 (evaluated on full 2048×2048 ground-truth grid); Edge gradient correlation edge_corr=0.6718 (#1 overall, +10.62% over Bicubic 0.5656); high-frequency recovery hf_ratio=0.5348 (#1 overall); Calibration plate PSNR=16.12dB (#1 overall): razor-sharp wood sign 'REALTEST 2026' and 'REALTEST 2048px GT' header, cleanly resolving 3px and 6px line-pair gratings.

Top overall choice for no-login, true 4x (2048×2048) unwatermarked PNG export with the highest edge sharpness recovery

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

2048×2048 (PNG · 4.0x Full Resolution) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

2048×2048 (PNG · 4.0x Full Resolution)

No watermark

Free tier supports up to 3 images per batch; developer REST API available

Not verified

Not verified

Network-observed server wait: 5.26s · End-to-end reference: 7.61s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

Direct 2x and 4x upscaling & export with no login required; optional Google/Email login

Not verified

Zero signup popups or deceptive upsell overlays; clicking 'Upscale' navigates straight to the clean download page (03_download.png).

Not verified

iLovePDF / Marco Grossi (Barcelona, Spain)

Barcelona, Spain

2016–Present

Operated by the Barcelona-based iLovePDF team, serving tens of millions of monthly users with top-tier provenance.

Not verified

Uploaded for cloud processing

Not verified

Upload took 2.35s and pure server 4x super-resolution inference took 5.26s, backed by a strict 2-hour auto-deletion policy.

Claims deletion within 2 hours; deletion not independently verified

Tested scale: 4×

4x upscaling of the 512×512 anchor to a native 2048×2048 PNG achieved 27.42 dB PSNR, 0.8876 SSIM, 0.6652 edge_corr, and 16.23 dB calibration plate PSNR with crisp lettering and line pairs.

Uploading the 512×512 degraded anchor without login and selecting 4x produced a native 2048×2048 watermark-free PNG in 7.49s server time (PSNR = 27.42 dB, SSIM = 0.8876, edge_corr = 0.6652, plate_psnr_db = 16.23 dB) with sharp wooden sign text and micro calibration lines (02_workspace.png, 03_download.png).

Everyday users seeking login-free, true 4x (2048×2048) watermark-free native PNG exports with strong edge sharpness and text restoration

Open native output ↗

Open result screenshot

Full test record →

2048 × 2048 · PNG · No watermark in test

2048×2048 (4x watermark-free native PNG, 3.35 MB)

Completely watermark-free (native 2048×2048 PNG export)

Supports up to 10x upscaling, portrait restoration, and background removal modes; Pro plan supports up to 20-image batch processing

2048 × 2048

2048 × 2048 · PNG

Network-observed server wait: 7.49s · End-to-end reference: 9.61s

2026-10-26 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 2x and 4x upscaling; also supports Google / Email sign-in

Not verified

Zero popup ads or forced sign-in walls; once upscaling finishes, an interactive Before/After comparison slider and direct download button appear immediately on the same page.

Not verified

Images-Upscale.com (Independent AI Upscaling Team)

Undisclosed jurisdiction (Cloudflare edge + cloud GPU inference)

2026–Present

Independent AI image upscaling service launched in 2026 with clear terms, privacy documentation, and support email, though without a disclosed corporate entity name.

Not verified

Uploaded for cloud processing

Google Analytics (G-0DP889885P)

Submits jobs via POST /api/tasks/upscale backed by Cloudflare R2 and cloud Real-ESRGAN GPU inference (7.49s server time, 2.94s upload time); the privacy policy states guest images are retained only temporarily and purged automatically after ~1 hour.

Claims deletion within 1 hours; deletion not independently verified

Tested scale: 4×

Text and materials looked natural in the tested upscale; findings cover this fixed image only.

Achieves 27.49 dB full-image PSNR, 0.8913 SSIM, and 16.04 dB calibration plate PSNR; carved wood on "REALTEST 2026" and brass knuckles are crisp and natural (edge_corr=0.6673, hf_ratio=0.5159).

Designers needing fast 3.8s 4x crisp super-resolution with high structural and color fidelity

Open native output ↗

Open result screenshot

Full test record →

2048 × 2048 · PNG · No watermark in test

2048×2048 (4.0x free 300DPI unwatermarked PNG export; supports secondary upscale to 4096×4096)

No watermark

Place multiple assets on the infinite canvas

2048 × 2048

2048 × 2048 · PNG

Network-observed server wait: 3.8s · End-to-end reference: 4.4s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Account required in this test

Free login via Google, Discord, Apple, or email

Manual erase / adjustment recorded in the historical flow

Places the 2048×2048 upscaled layer directly beside the 512×512 original on the infinite canvas (02_result.png) so the 4x scale jump is visually obvious; visible AI label toggle is off by default (03_download.png).

Not verified

Recraft Inc.

London, UK

2022–2026

Proprietary Recraft Crisp super-resolution engine built by Recraft Inc. (London).

Recraft Crisp is widely used by designers to prepare print-ready 300 DPI assets directly on the canvas.

Uploaded for cloud processing

Sentry · First-party Telemetry (t.recraft.ai)

Cloud GPU completes 512px -> 2048px (4.0x) super-resolution in ~3.8s with PNG/JPG and custom DPI export.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 2×

The tested 2× result had clear lettering without obvious artifacts, at 1024px.

PSNR=27.08dB · SSIM=0.8862 (2x 1024×1024 unwatermarked PNG); Edge gradient correlation edge_corr=0.6080 (+4.24% over Bicubic); high-frequency recovery hf_ratio=0.4716 (+10.65%); Calibration plate PSNR=15.54dB: clean 'REALTEST 2026' typography with zero ringing artifacts in just 2.64s.

Users looking for the most consistent all-around free suite (no-login unwatermarked exports across BG Remover, T2I, and 2x Upscaler)

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024×1024 (PNG · 2.0x Fast Upscale) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (PNG · 2.0x Fast Upscale)

No watermark

Pro plan supports 1,000 batch exports/month and developer API

Not verified

Not verified

Network-observed server wait: 2.64s · End-to-end reference: 5.19s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 2x upscaling and unwatermarked download; optional Google/Apple/Email login

Not verified

Spotless modern AI Image Editor workspace with zero third-party ads, zero forced login walls for 2x, and a built-in Compare toggle.

Not verified

Pixelcut Inc. (San Francisco, USA)

San Francisco, CA, USA

2020–Present

Operated by YC-backed Pixelcut Inc. (San Francisco, USA), trusted by 200,000+ brands.

Not verified

Uploaded for cloud processing

Not verified

Fast gRPC architecture: 2.55s upload and 2.64s pure server Upscale inference, exporting a 1.87MB lossless PNG.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

Ran 4× upscaling locally with noise reduction and text retention; speed depends on the device.

Waifu2x Unlimited (Swin-UNet Photo 4x) suppresses JPEG compression artifacts cleanly while preserving natural camera gradients (PSNR 28.34 dB, SSIM 0.895) in 2.63s via WebGPU, without introducing fake generative hallucinations.

Privacy-conscious users, anime/illustration and natural photo creators who want 100% free, unlimited 4x local GPU super-resolution without uploading files to any cloud server

Open native output ↗

Open result screenshot

Full test record →

2048 × 2048 · PNG · No watermark in test

2048 × 2048 (true 4x lossless PNG export, supporting arbitrary large-image tiled inference)

Watermark-free

Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size

2048 × 2048

2048 × 2048 · PNG

Recorded local processing time: 2.63s · End-to-end reference: 2.63s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

100% usable without login (runs entirely in the local browser via WebGPU)

Not verified

Pure single-page engineering workbench: select model (Swin-UNet Art / Photo), Denoise level, and 1x/2x/4x scale, then immediately preview or download the 2048×2048 PNG.

Not verified

nagadomi (waifu2x / nunif Open-Source Author)

Independent open-source AI vision researcher (Japan)

2015–Present (waifu2x.net)

Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework.

Not verified

On-device processing

Not verified

100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection.

This flow runs locally; post-close deletion not independently verified

Tested scale: 3.69×

Main lettering and detail were clear; tiny letters showed some redrawing.

Achieves 27.34 dB full-image PSNR, 0.8878 SSIM, and a high 0.7543 edge gradient correlation (hf_ratio=0.615); carved wood grain on "REALTEST 2026" and brass knuckles are crisp, while the tiny 3rd-row micro-text on the calibration plate shows mild generative stroke reshaping.

Users seeking sharp wood/metal texture enhancement (edge_corr=0.7543) with no-login near-2K unwatermarked exports

Open native output ↗

Open result screenshot

Full test record →

JPEG · Output attached · No watermark in test

1888×1888 (Guest no-login 2K tier exports 3.69x unwatermarked JPG; supports up to 8K/16K)

No watermark

Available via Batch Image Editor

1888 × 1888

Not verified

Network-observed server wait: 6.8s · End-to-end reference: 8.19s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required (uses the shared 10 Guest Free Credits pool)

Manual erase / adjustment recorded in the historical flow

Provides a clean 512px -> 1888px before/after comparison slider and direct browser download with zero login walls.

Not verified

MagicEraser.org / ImgUpscaler.ai Matrix

US / APAC Independent AI Team

2023–2026

Powered directly by its sibling ImgUpscaler.ai v2 super-resolution pipeline (api-v2.imgupscaler.ai / image_enhance_v1).

Rare transparency in explicitly warning users that standard upscaling does not add detail and pointing them to the AI Enhance tool.

Uploaded for cloud processing

Google Analytics · Aliyun SLS Web Tracking

Completes 3.69x cloud super-resolution in 6.80s over HTTPS without disguising basic interpolation as AI upscaling.

Claims deletion within 4 hours; deletion not independently verified

Tested scale: 2×

The tested 2× output was watermark-free with some edge recovery, at 1024px.

PSNR=27.57dB · SSIM=0.8918 (2x 1024×1024 unwatermarked PNG); ranks #1 in PSNR and SSIM among all 2x free upscalers with edge_corr=0.6496, hf_ratio=0.5289, and a blazing 1.74s Network-observed server wait.

Everyday office and e-commerce users seeking instant 1.7s no-login 2x lossless super-resolution

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024×1024 (PNG · 2.0x Super Resolution) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (2.0x · Free without login; 4x/8x require PixelBin paid plan)

100% Watermark-Free

Bulk transformation, real-time URL super-resolution, and REST API via PixelBin.io

Not verified

Not verified

Network-observed server wait: 1.74s · End-to-end reference: 3.54s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 2x; optional sign-in via console.pixelbin.io

Not verified

Smooth no-login 2x workflow; displays standard banner ads and a PixelBin promotion bar without obstructing the download button.

Not verified

PixelBin.io / Shopsense Retail Technologies Ltd. (Reliance Retail)

Mumbai, India

2021–Present

Operated by Shopsense Retail Technologies Ltd. (PixelBin.io / Reliance Retail subsidiary, Mumbai, India—the same enterprise cloud behind Erase.bg), holding SOC 2, ISO 27001, and GDPR certifications.

Not verified

Uploaded for cloud processing

Not verified

Backed by PixelBin's `delivery.pixelbin.io/predictions/outputs/1d/sr/upscaleRestricted/` edge pipeline with an explicit 24-hour (`1d`) auto-expiring storage bucket.

Claims deletion within 24 hours; deletion not independently verified

Tested scale: 4×

The tested 4× photo configuration produced smooth output with text retained; other settings remain untested.

Configured to Photo + 4x + Low Noise Reduction, Bigjpg exported a clean 2048×2048 PNG scoring PSNR = 28.27 dB and SSIM = 0.9790 with smooth tonal transitions and zero generative hallucinations.

Users wanting a no-login, zero-watermark 4x (2048px) upscaler with 5-level adjustable noise reduction for photos and illustrations

Open native output ↗

Open result screenshot

Full test record →

2048 × 2048 · PNG · No watermark in test

2048 × 2048 (Full 4x Unwatermarked PNG)

None (100% watermark-free)

Multi-image queue, Windows/Mac desktop apps, and REST API

2048 × 2048

2048 × 2048 · PNG

Network-observed server wait: 18.5s · End-to-end reference: 20s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required; optional account login for history sync and parallel high-speed queues

Not verified

Zero registration, zero popups, and zero watermarks: once processing completes, a green "Download (274.41 KB)" button directly exports the full 4x (2048×2048) PNG.

Not verified

Bigjpg Team

Cross-Platform AI Super-Resolution Team (Launched 2017)

2017–present (9+ years)

Operating continuously since 2017 as one of the best-known Waifu2x / SRCNN deep convolutional super-resolution services across Web, Windows, macOS, iOS, Android, and API.

Not verified

Uploaded for cloud processing

Not verified

Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

The tested 4× upscale retained sign text and detail; findings cover the fixed fixture only.

Adobe Firefly Upscaler ('Powered by Photoshop') excels at faithful super-resolution: it unlocks 4x (2048×2048) on the free tier, achieves 26.91dB PSNR and 0.8839 SSIM, sharpens the brass robot's finger joints and carved sign text, and preserves the fine calibration plate text and frequency gratings without hallucination.

Design and photography workflows requiring true 4x (2048×2048) faithful super-resolution without AI hallucination distorting text or facial features

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

2048×2048 (4.0x Unwatermarked JPG) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

2048×2048 (4.0x Unwatermarked JPG)

None (100% watermark-free)

Seamlessly chains upscaled results into Generative Remove or Remove Background within the same canvas

Not verified

Not verified

Network-observed server wait: 7.4s · End-to-end reference: 8.2s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Account required in this test

Free Adobe account sign-in via Google, Apple, Facebook, or email

Not verified

Clean workspace ('Powered by Photoshop') displaying live target dimensions ('W x H 2048×2048') next to the 2x/4x selector, with zero upsell popups or countdown timers.

Not verified

Adobe Inc. (NASDAQ: ADBE)

San Jose, California, USA

Founded 1982 (Creator of Photoshop and Adobe Firefly)

Official Adobe Inc. (NASDAQ: ADBE) Firefly Upscaler built on Photoshop Camera Raw Super Resolution and Firefly vision research.

Not verified

Uploaded for cloud processing

Not verified

Supports 2x and 4x cloud super-resolution (expandable up to 8192×8192) while preserving exact typography and geometry without hallucination.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

The tested 4× output was watermark-free with clear main lettering; inspect small text and other images separately.

PSNR=26.95dB · SSIM=0.8846 (native 4x 2048×2048 unwatermarked PNG export); Edge gradient correlation edge_corr=0.6141 (+4.85% over Bicubic); high-frequency recovery hf_ratio=0.4636; Calibration plate PSNR=15.56dB: clean 'REALTEST 2026' wood sign and smooth natural brass surface rendering.

Users needing 4x/8x high-resolution upscaling (up to 5000×5000px) combined with multi-layer canvas editing

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

2048×2048 (PNG · 4.0x Super Scale) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

2048×2048 (PNG · 4.0x Super Scale)

No watermark

Supports chained 2x/4x/8x upscaling up to 5000×5000px (25MP) and multi-layer editing

Not verified

Not verified

Network-observed server wait: 3.4s · End-to-end reference: 3.85s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Account required in this test

Free login via Google, Apple, Facebook, or Email

Not verified

Displays third-party video ads along the right sidebar on the free tier and caps free local saves at 3 per day.

Not verified

Pixlr Pte. Ltd. (Inmagine Group / 123RF)

Singapore

2008–Present

18-year veteran photo suite operated by Singapore's Inmagine Group (123RF), with Plus plans starting at $1.99/mo.

Not verified

Uploaded for cloud processing

Not verified

4x (2048×2048) upscale completed in ~3.40s and exported a 3.1MB lossless PNG (also supports JPG, WebP, PDF, PXZ).

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

Text and highlights looked natural in this 4× result; free use remains credit-limited.

VanceAI 4x super-resolution achieves PSNR = 26.86 dB and SSIM = 0.9717 on our 512→2048 restoration benchmark (03_download.png), preserving natural wood-carved lettering, metallic highlights, and apple surface sheen with no-login unwatermarked delivery.

Designers and e-commerce users seeking no-login unwatermarked 4x/8x super-resolution combined with sharpening, denoising, or old-photo restoration

Open native output ↗

Open result screenshot

Full test record →

PNG · Output attached · No watermark in test

2048 × 2048 (4x upscaled unwatermarked JPG)

No watermark (exports clean image directly after deducting trial credits)

Built-in Batch Processing Review queue, commercial REST API, and Windows local desktop client

2048 × 2048

Not verified

Network-observed server wait: 6.4s · End-to-end reference: 7.9s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

10 Free trial credits granted without login; also supports account login and PC desktop client

Not verified

Allows selecting 2x / 4x / 8x scale factors inside Picture Studio and saving a clean 2048×2048 unwatermarked image without registration or credit card gates.

Not verified

VanceAI Technology

International R&D Team (VanceAI)

2020–Present

Official tool by VanceAI Technology (founded 2020, offering web cloud studio, VanceAI PC local desktop software, and commercial API).

Not verified

Uploaded for cloud processing

Not verified

Clearly states "Files are saved for 7 days. Please download them in time" in the bottom-left corner with a one-click Delete All button, delivering files via signed Cloudflare R2 links.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 2×

Denoising and highlight transitions looked natural; the tested free output was 2× at 1024px.

PSNR=27.17dB · SSIM=0.8867 (2x 1024×1024 unwatermarked PNG); Edge gradient correlation edge_corr=0.6069; high-frequency recovery hf_ratio=0.4791 (+11.40% over Bicubic); Calibration plate PSNR=15.69dB: excellent denoising and clean specular transitions on the oak table and blue ceramic mugs.

Users wanting a clean, ad-free interface with no-login batch 2x upscaling (up to 10 images at once)

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024×1024 (PNG · 2.0x Unwatermarked) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (PNG · 2.0x Unwatermarked)

No watermark

Free tier supports dragging up to 10 files at once, plus enterprise Jasper/Clipdrop Super-Resolution API

Not verified

Not verified

Network-observed server wait: 4.05s · End-to-end reference: 4.97s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 2x upscaling (up to 10 images per batch) and unwatermarked download; 4x/8x/16x require Pro

Not verified

Minimalist, ad-free workspace (02_workspace.png / 03_download.png) that even allows up to 10 images per batch on the free tier.

Not verified

Jasper AI, Inc. (acquired Clipdrop from Stability AI / Init ML)

Paris, France / Austin, TX, USA

2020–Present

Originally founded by Paris-based Init ML, later acquired by Stability AI and Jasper AI.

Not verified

Uploaded for cloud processing

Not verified

Uses non-intrusive Cloudflare Turnstile verification (0.92s) followed by api.clipdrop.co/super-resolution/v1 (4.05s) streamed directly to a local Blob.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

This 500x500 sample was upscaled 4x to 2000x2000 with sharp text edges; output was exported as JPEG.

Guest Image Enhancer flow upscales the 512px anchor to a 2048×2048 native JPEG (4x) with sharp text on the wooden sign and calibration plate.

Not verified

Open native output ↗

Open result screenshot

Full test record →

JPEG · Output attached · Check watermark record

Not verified

Not verified

Not verified

2048 × 2048

Not verified

Network-observed server wait: 2.72s · End-to-end reference: 3.86s

2026-10-19 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Not verified

No login required in app.photoroom.com/ai-tools Image Enhancer; Google / Apple / Facebook / email supported

Not verified

Requires navigating from the SEO landing page into the web app tool catalog to upload, but the Image Enhancer workflow itself completes without popups or forced registration.

Not verified

AI Visual Unicorn (Paris, France)

Not verified

Not verified

Operated by PhotoRoom SAS (Paris, France), a widely recognized AI visual editing platform across mobile and web.

Not verified

Uploaded for cloud processing

Not verified

Processes 4x upscaling via synchronous HTTPS endpoint ai-gateway.photoroom.com/v3/upscale returning a binary JPEG.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 1.46×

Texture was retained in this fixture; free output was only 750px, about 1.46× enlargement.

PSNR=27.61dB (#1 highest pixel PSNR overall) · SSIM=0.8955 (#1 highest structural similarity overall); Edge gradient correlation edge_corr=0.6353 (#3 overall, +6.97% over Bicubic); hf_ratio=0.4482 (constrained by the free tier's 750×750 1.46x resolution cap); Calibration plate PSNR=16.01dB (#2 overall): exceptional fidelity with zero hallucinated artifacts on the wood sign or grating.

Users prioritizing top pixel fidelity (highest PSNR/SSIM) who are satisfied with 750px free previews or willing to spend credits for 1024px HD

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

750×750 (PNG · 1.46x Free Preview) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

750×750 (PNG · 1.46x Free Preview)

No watermark

Offers Windows/Mac desktop batch app and REST API

Not verified

Not verified

Network-observed server wait: 2.65s · End-to-end reference: 3.94s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 750×750 preview download; 1024×1024 HD requires login and 2 credits

Not verified

Provides Quality vs Fidelity mode toggles with zero popup ads.

Not verified

LibAI Tech Co., Ltd. (Cutout.pro)

Hong Kong

2018–Present

Core visual AI product by LibAI Tech Co., Ltd.

Not verified

Uploaded for cloud processing

Not verified

Fast 2.65s pure server processing and an explicit 60-minute automatic file deletion notice right below the download buttons.

Claims deletion within 60 minutes; deletion not independently verified

Tested scale: 2×

The tested 2× output was watermark-free with sharper edges; higher scales were not verified here.

PSNR=27.04dB · SSIM=0.8862 (2x 1024×1024 Free tier unwatermarked PNG); Edge gradient correlation edge_corr=0.6074; high-frequency recovery hf_ratio=0.4780 (+11.29% over Bicubic); Calibration plate PSNR=15.52dB: noticeable sharpening on 'REALTEST 2026' wood sign and apple skin highlights.

Users who want instant, in-page no-login 2x (1024×1024) image enhancement without being redirected into a heavy editor

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024×1024 (PNG · 2.0x Free Tier) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (PNG · 2.0x Free Tier)

No watermark

Pro tier supports batch image enhancement and programmable APIs

Not verified

Not verified

Network-observed server wait: 3.2s · End-to-end reference: 4.6s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required to export 2x (1024×1024) Free tier; 4x (2048×2048) requires Pro/Ultra subscription

Not verified

Completes Before/After comparison and 1024×1024 unwatermarked PNG export right on the landing page with zero login required.

Not verified

PicsArt, Inc. (Miami, FL / Yerevan)

Miami, FL, USA / Yerevan, Armenia

2011–Present

Global creative unicorn PicsArt, Inc. with 150M+ monthly active creators.

Not verified

Uploaded for cloud processing

Not verified

Privacy note: enhanced outputs are stored on an unauthenticated public CDN URL (cdn-ai-hs.picsart.com/ai-hot-storage/...), so avoid uploading sensitive private documents.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

Upscaled 4X from 512px to 2048×2048 with 28.05 dB PSNR and 0.8979 SSIM, preserving sharp brass robot edges, wooden sign lettering, and micro calibration plate lines.

Upscaling the 512×512 canonical anchor at 4X (consuming 2 free credits) produces a native 2048×2048 JPEG (PSNR = 28.05 dB, SSIM = 0.8979, edge_corr = 0.7118, plate_psnr_db = 16.85 dB, server wait 6.42s) with sharp brass robot details, wooden sign lettering, and calibration plate lines.

Users willing to sign in to a free account and use daily free credits to export true 4X (2048×2048) high-fidelity watermark-free upscaled images

Open native output ↗

Open result screenshot

Full test record →

JPEG · Output attached · No watermark in test

2048×2048 (4X watermark-free native JPEG, 2.78 MB)

Completely watermark-free (native 2048×2048 JPEG export)

Offers commercial API and full online editor handoff

2048 × 2048

Not verified

Network-observed server wait: 6.42s · End-to-end reference: 6.84s

2026-10-23 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Account required in this test

Supports free Google / Facebook / Apple / Email sign-in (6 daily free AI credits granted)

Not verified

The workspace provides 2X/4X scale toggles and a Before/After comparison slider (02_result.png). Although a "Your Cloud storage is full" upgrade modal may appear when entering the editor, dismissing it and clicking Apply -> Download exports the native 2048×2048 watermark-free JPEG without payment gating (03_download.png).

Not verified

AndOr Communications Pvt. Ltd. (LightX)

New Delhi, India

2017–Present

Operated by AndOr Communications Pvt. Ltd. (New Delhi, India), creator of the LightX mobile and web visual AI suite with tens of millions of users.

Not verified

Uploaded for cloud processing

Not verified

Uses AWS S3 presigned uploads paired with POST https://www.instagraphe.mobi/andor-media-1.0/aiartweb/generateImage async inference and CDN delivery; after vendor S3 credential recovery on 2026-10-23, single-sample server wait measured 6.42s (6.84s end-to-end).

Explicit retention period unconfirmed; inspect policy record

Tested scale: 4×

This guest run produced a watermark-free 4× image with structure retained; findings cover this fixture only.

PSNR=27.50dB · SSIM=0.8900 (4x 2048×2048 unwatermarked PNG); edge_corr=0.6685, hf_ratio=0.4995, plate_psnr=16.22dB—one of the very few tools offering genuine 400% watermark-free exports to anonymous guests.

Users who want true 4x (2048×2048) watermark-free faithful super-resolution without creating an account

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

2048×2048 (PNG · 400% / 4.0x AI Upscale) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

2048×2048 (4.0x / 400% · Free without login)

100% Watermark-Free

Batch web upload on paid plans; offline batch processing via desktop app Upscal.app

Not verified

Not verified

Network-observed server wait: 20.68s · End-to-end reference: 22.22s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required; optional email/Google login for paid plans

Not verified

Zero login walls or bait-and-switch paywalls, though the free web page runs Google AdSense including a full-screen interstitial vignette (`#google_vignette`, Screenshot ④) that may require dismissing.

Not verified

ImgUpscaler / Upscal.app Team

Independent Cross-Platform Utility Team (Web + macOS/Windows App Store)

2020–Present

Operated by the independent team behind Upscal.app (available on the Mac App Store and Microsoft Store).

Not verified

Uploaded for cloud processing

Not verified

Uses `/api/legacy/upload` and `/api/legacy/status` async polling; FAQ #10 explicitly states all uploaded and processed images are permanently deleted within 24 hours.

Claims deletion within 24 hours; deletion not independently verified

Not verified

The tested upscale looked natural and multiple formats are offered; those formats were not individually tested.

Img2Go Upscale Image restores the 512×512 anchor to a crisp 1024×1024 PNG (1.1 MB) with faithful brick and clock-tower colors (PSNR 27.07 dB, SSIM 0.8866) and zero ringing artifacts.

Users seeking clean, artifact-free 2x image enlargement with explicit DPI and format controls and zero registration friction

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024 × 1024 (2.0x default PNG, 1.1 MB) / custom dimensions · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (Default 2x Mode) / Configurable Custom Target Dimensions

Watermark-Free

Supports custom width/height/DPI settings and instant Delete Task

Not verified

Not verified

Network-observed server wait: 11.2s · End-to-end reference: 11.6s

2026-10-19 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required

Not verified

Provides direct Width, Height, DPI, and target image format selectors before starting, with a clean Download button on completion.

Not verified

QaamGo Web GmbH (Radolfzell, Germany)

Radolfzell, Germany

2016–Present

Operated by QaamGo Web GmbH (Radolfzell, Germany), the European team behind PDF2Go and Online-Convert.

Not verified

Uploaded for cloud processing

Not verified

EU GDPR compliant with one-click Delete Task on the download screen and automatic 24-hour file purge.

Claims deletion within 24 hours; deletion not independently verified

Tested scale: 4×

This guest run produced a watermark-free 4× upscale; input size and free allowances remain limited.

Nero AI is a standout dark horse in image upscaling: its Photo 4x model achieves 27.49 dB PSNR, 0.8895 SSIM, and 0.6704 Edge Correlation with zero watermarks and no login required — a sharp contrast to its 2000px-gated background and object removers.

Users who want guest-free, unwatermarked 4x upscaling on small/medium images (<=2000px) with top-tier PSNR fidelity

Open native output ↗

Open result screenshot

Full test record →

2048 × 2048 · PNG · No watermark in test

2048 × 2048 (True 4.0x unwatermarked upscale)

No watermark

Supports batch upload, commercial API (/ai-api), and desktop software

2048 × 2048

2048 × 2048 · PNG

Network-observed server wait: 18.2s · End-to-end reference: 19.3s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for up to 5 images; login grants extra free credits

Not verified

Grants guests 5 free upscales (via "View as a guest") and exports a full 2048x2048 unwatermarked PNG at 4x (03_download.png).

Not verified

Nero AG

Karlsruhe, Germany

1995–present

Flagship AI upscaler by Nero AG (Karlsruhe, Germany, founded 1995).

Not verified

Uploaded for cloud processing

Not verified

Offers 5 specialized models (Photo, Anime, Standard, Iris, Reconstruct) and outputs a clean 2048x2048 unwatermarked blob.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 2×

Downloaded a watermark-free 1024px image; the preview watermark was absent from the saved file.

Aiseesoft Image Upscaler Online displays a preview watermark to prevent right-click scraping but honors its caption 'After saving, the image has no watermark': clicking Save exports a clean 1024×1024 PNG scoring PSNR = 27.03 dB and sign ROI PSNR = 30.32 dB.

Users needing a no-login, watermark-free 2x image upscaler with high text fidelity

Open native output ↗

Open result screenshot

Full test record →

1024 × 1024 · PNG · No watermark in test

1024 × 1024 (2x Unwatermarked PNG)

Watermark-free after clicking Save (preview canvas shows anti-scraping watermark, saved file is 100% clean)

Single-image web tool; batch upscaling available in desktop version

1024 × 1024

1024 × 1024 · PNG

Network-observed server wait: 14.2s · End-to-end reference: 16.1s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required; optional account login and Upgrade button

Not verified

No signup or payment required for 2x (1024×1024) watermark-free saving; higher scales (4x / 6x / 8x) clearly indicate Upgrade.

Not verified

Aiseesoft Studio

Established Multimedia Software Vendor (Founded 2008)

2008–present (18+ years)

Developed and operated by Aiseesoft Studio (founded in 2008), alongside its desktop AI Photo Editor and mobile Picwand app.

Not verified

Uploaded for cloud processing

Not verified

Lossless 512×512 upload upscaled 2x in the cloud and delivered as a clean client-side PNG blob upon clicking Save.

Claims deletion within 24 hours; deletion not independently verified

Tested scale: 4×

Edges were visibly enhanced; the free tier was 1280px, with 2048px in a separate tier.

PSNR=26.47dB · SSIM=0.8754; strong edge sharpening (edge_corr=0.6714) and HF texture gain (hf_ratio=0.5613) on the 'REALTEST 2026' wooden sign, apples, and ceramic cups; Save menu clearly separates 1280×1280 Free and 2048×2048 Full tiers.

Users who want to compare Standard, HD, Ultra HD, and Old Photo Restoration models in one workspace and are satisfied with 1280px free exports

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1280×1280 (2.5x free unwatermarked) / 2048×2048 (4.0x preview carries bottom notice watermark) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1280×1280 (2.5x Free unwatermarked) / 2048×2048 (4.0x Preview or Pro export)

Unwatermarked on 1280×1280 free download after login (preview explicitly notes 'No watermark after download')

Supports Bulk Edit (up to 30 images) and developer PicWish API

Not verified

Not verified

Network-observed server wait: 6.2s · End-to-end reference: 8s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required for 2048×2048 interactive preview; Google / Apple / Email login required to download Free Image (1280×1280)

Not verified

Ad-free workspace offering 5 enhancement models (Standard, HD, Ultra HD, Ultra HD Max, Restoration) plus an AI prompt box; clicking Free Image prompts account login.

Not verified

Wangxu Technology Co., Ltd. (Apowersoft)

Hong Kong & Shenzhen, China

2021–Present

Developed by Wangxu Technology Co., Ltd. (Apowersoft, Hong Kong & Shenzhen), ISO/IEC 27001 certified.

Not verified

Uploaded for cloud processing

Not verified

Results are served via Alibaba Cloud Hong Kong OSS (`wxtechhk.oss-cn-hongkong.aliyuncs.com`) with 1-hour (`x-oss-expires=3600`) OSS4-HMAC-SHA256 signed URLs.

Claims deletion within 1 hours; deletion not independently verified

Tested scale: 2×

2x free export (1024×1024 JPEG) reaches PSNR 26.97 dB and SSIM 0.8870; brass robot and wooden sign lettering are crisp, while fine calibration lines reflect the 2x ceiling.

2x free export (1024×1024 JPEG) achieves PSNR 26.97 dB and SSIM 0.8870 against the 2048px GT; brass robot and 'REALTEST 2026' sign are sharp, while 4x HD (2048×2048) is reserved for paid members.

Not verified

Open native output ↗

Open result screenshot

Full test record →

JPEG · Output attached · Check watermark record

Not verified

Not verified

Not verified

1024 × 1024

Not verified

Network-observed server wait: 6.81s · End-to-end reference: 6.82s

2026-10-21 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Not verified

Supports Google / Facebook / Apple / Email account sign-in on /image-upscaler/

Not verified

Upload, super-resolution preview, and 2x Low-res JPEG export all complete directly inside the right-hand card on /image-upscaler/ without redirecting into a heavy canvas editor or blocking download with a forced trial wall.

Not verified

Everimaging Ltd. (Fotor)

Not verified

Not verified

Operated by Everimaging Ltd. (Fotor, founded 2012), an established cross-platform online visual and design SaaS.

Not verified

Uploaded for cloud processing

Not verified

Uploads directly to a temporary AWS S3 bucket (img-fotor.s3.us-west-2.amazonaws.com/temp/super/) and polls /api/image/sr/task/v3 -> /api/image/sr/result/v2 (network-observed server wait 6.81s).

Explicit retention period unconfirmed; inspect policy record

Tested scale: 2×

No obvious artifacts appeared in this 2× test; recovery of fine blurred edges remained limited.

PSNR=27.34dB · SSIM=0.8924 (2x 1024×1024 JPG); Mode A GT exposes the underlying algorithm: edge_corr=0.5740 and hf_ratio=0.4018 sit barely above standard non-AI Bicubic interpolation (0.5656 / 0.3651), proving its 0.60s speed comes from a lightweight CNN/unsharp filter rather than deep super-resolution; Calibration plate PSNR=15.60dB: artifact-free, but recovers significantly less high-frequency edge detail than iLoveIMG or Upscale.media.

Users needing instant (0.6s), completely free no-login 2x JPG enlargement without deep high-frequency texture reconstruction

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →

1024×1024 (JPG · 2.0x Unwatermarked) · Historical description; output not attached · Check watermark record

No native output is attached; check the evidence for specification and watermark claims.

1024×1024 (JPG · 2.0x Unwatermarked)

No watermark

Single JPEG upload only; no batch or 4x options

Not verified

Not verified

Network-observed server wait: 0.6s · End-to-end reference: 3.32s

2026-10-16 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

100% free no-login 2x (1024×1024) JPG export, but strictly accepts JPEG/JPG uploads only (rejects PNG)

Not verified

Triggers a browser notification permission prompt on page load and restricts uploads strictly to JPEG/JPG files (no PNG support).

Not verified

Depositphotos Inc. (Vista / Cimpress Group)

New York, NY, USA

2009–Present

Operated by New York stock photography giant Depositphotos Inc. (part of Vista / Cimpress).

Not verified

Uploaded for cloud processing

Not verified

Fastest Network-observed server wait at 0.60s, backed by an explicit 24-hour automatic file deletion policy.

Claims deletion within 24 hours; deletion not independently verified

Tested scale: 2×

Denoising and text edges were retained; the tested free tier was limited to 2× at 1024px.

DeWatermark Image Enhancer's 2X model prioritizes faithful denoising and edge sharpening, scoring PSNR = 27.12 dB overall and 30.46 dB on the engraved wooden sign without hallucinated textures, though 4X (2048×2048) is locked behind Pro.

Users seeking high-PSNR, artifact-free 2x image enhancement without login or watermarks

Open native output ↗

Open result screenshot

Full test record →

1024 × 1024 · PNG · No watermark in test

1024 × 1024 (2X Unwatermarked)

Watermark-free

Supports Batch Enhance Photo and REST API

1024 × 1024

1024 × 1024 · PNG

Network-observed server wait: 8.1s · End-to-end reference: 9.5s

2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

No login in this test

No login required; optional email/Google login

Not verified

No signup or watermark on the 2X (1024×1024) export; only selecting 4X triggers the Pro upgrade modal.

Not verified

XTeam (DeWatermark.ai)

Global AI Vision Team (XTeam)

2023–present

Operated by XTeam (DeWatermark.ai) with both single-image and Batch Enhance Photo modes.

Not verified

Uploaded for cloud processing

Not verified

Lossless 512×512 upload with 60-minute automatic cloud cleanup.

Claims deletion within 60 minutes; deletion not independently verified

Tested scale: 2×

This 512x512 sample was upscaled 2x to a 1024x1024 lossless PNG with crisp text on the wooden sign and calibration plate.

Same authenticated free account: uploaded 512px canonical upscaling anchor, selected default 2x, spent 2 credits, downloaded native PNG. Two free credits remain. Output and GT metrics will be inspected separately.

Users with a Wondershare account who occasionally need clean 2x lossless PNG upscaling

Open native output ↗

Open result screenshot

Full test record →

1024 × 1024 · PNG · No watermark in test

[1024, 1024]

No watermark on the 1024×1024 native PNG export within free credits

Single-image upload workflow

1024 × 1024

1024 × 1024 · PNG

Network-observed server wait: 27.09s · End-to-end reference: 27.75s

2026-10-19 · anchor_upscale_v1 · US-West (California, AS2914)

No standardized repetition count, success rate or variability range is recorded.

Account required in this test

Authorized test profile; see dated run record

No manual brush refinement

Historical rubric scores withdrawn pending review of the new run. Same authenticated free account: uploaded 512px canonical upscaling anchor, selected default 2x, spent 2 credits, downloaded native PNG. Two free credits remain. Output and GT metrics will be inspected separately.

Not verified

Publicly Listed Multimedia Software Giant AI Flagship (Wondershare, 300624.SZ)

Shenzhen, China / Vancouver, Canada

Not verified

Historical rubric scores withdrawn pending review of the new run. Same authenticated free account: uploaded 512px canonical upscaling anchor, selected default 2x, spent 2 credits, downloaded native PNG. Two free credits remain. Output and GT metrics will be inspected separately.

Not verified

Uploaded for cloud processing

Sensors Data (analytics.300624.com) · Google Analytics · Facebook Pixel

Historical rubric scores withdrawn pending review of the new run. Same authenticated free account: uploaded 512px canonical upscaling anchor, selected default 2x, spent 2 credits, downloaded native PNG. Two free credits remain. Output and GT metrics will be inspected separately.

Explicit retention period unconfirmed; inspect policy record

Tested scale: 2×

Added detail while retaining overall structure; check newly generated texture against the input.

PSNR=25.77 dB · SSIM=0.9605 · edge_corr=0.6507 · hf_ratio=0.7040: unlike diffusive enhancers that heavily alter lighting and geometry, Leonardo's Aurora Precise mode injects rich high-frequency detail while preserving 0.9605 SSIM structural consistency.

Designers and AI artists who want the best balance between generative micro-texture sharpening (`hf_ratio=0.7040`) and structural fidelity (`SSIM=0.9605`), with ~30 free upscales per day

No native output obtained; the preview does not establish final export quality.

Open result screenshot ↗

Full test record →