See your options side by side
Choose one task and 2–4 tools. Compare pricing, output, test results and trust.
Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | Unlimited:Waifu2x | Img2Go | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 88/100 2048 × 2048 (4.2 MB full-resolution RGBA PNG) · Historical description; output not attached | Compare in task topic → |
| Image compression | Not tested in topic | 80/100 2048 × 2048 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 84/100 1024 × 1024 (2.0x default PNG, 1.1 MB) / custom dimensions · Historical description; output not attached | Active task |
| Image generation | Not tested in topic | 87/100 1024 × 1024 · PNG | Compare in task topic → |
| Photo restoration | Not tested in topic | 89/100 1024 × 1024 · PNG | Compare in task topic → |
Select at least 2 tools to compare
You can also filter a task page first, then compare your shortlist.
Browse this task →| Criterion | Unlimited:Waifu2x (WebGPU In-Browser SR) Image upscaling 89/100 Seven-aspect task score Free open-source, login-free on-device processing gives good 4× detail; a dismissible rewarded-ad prompt may appear on first use. Tested export 2048 × 2048 · PNG Historical test · 2026-10-17 | Img2Go Upscale Image Image upscaling 84/100 Seven-aspect task score Login-free access offers many formats, size controls and deletion; default output is only 2×, so larger sizes need manual settings. Tested export 1024 × 1024 (2.0x default PNG, 1.1 MB) / custom dimensions · Historical description; output not attached Historical test · 2026-10-19 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | unlimited:waifu2x in-browser AI image upscaler · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits unlimited:waifu2x Free Web2026-10-21 ↗ Free Free Free Free without login and no image-count limits (runs on local WebGPU/WASM hardware); supports up to 4x unwatermarked PNG export. 1 plan / billing-period records, all listed; — means that period is not recorded. In-browser WebGPU/WebAssembly upscaler powered by nunif/waifu2x. Completely free with no account system or paid tiers; offers swin_unet and cunet models, 1x/2x/4x upscaling, and denoise levels running on local device hardware. Cancellation, sources & verification recordCompletely free open-source-powered tool with no accounts or subscription charges. unlimited:waifu2x official page ↗ · 2026-10-21 Capture 1 ↗ | Website free, monthly, annual and education plans; USD, Business billed per person · 2026-10-20 Plan · source date Monthly / one-time Annual bill / period Quota & limits Starter2026-10-20 ↗ USD 8/month USD 77/year Monthly Baseline 1× AI usage; batch processing Annual Baseline 1× AI usage; 64GB files and batch processing Business2026-10-20 ↗ USD 89/month USD 854/year Monthly Per-user billing; 20× Starter AI usage Annual Per-user billing; 20× Starter AI usage Education program2026-10-20 ↗ Free Free Free Paid apps free after student/teacher eligibility verification; non-commercial educational use only 8 plan / billing-period records, all listed; — means that period is not recorded. Actual annual amounts are $77/$278/$854. Absolute removal quotas and per-image credit usage are unpublished; 1×/5×/20× cannot be converted into image counts. Cancellation, sources & verification recordPage advertises a 14-day money-back guarantee and cancellation anytime; eligibility is subject to terms. Official plans and usage terms ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ |
| Free & trial allowance on the test date | Unlimited local WebGPU runs with zero daily caps or credit deductions | Free visitors can upscale images and download unwatermarked PNGs without creating an account |
| Cancellation & refunds | Completely free open-source-powered tool with no accounts or subscription charges. | Page advertises a 14-day money-back guarantee and cancellation anytime; eligibility is subject to terms. |
| Disclosure of costs & limits | Explicitly discloses WebGPU browser requirements and model options at the top of the page | Displays target format, dimension, and DPI controls upfront before processing |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Not verified |
| Fixture findings | Ran 4× upscaling locally with noise reduction and text retention; speed depends on the device. | The tested upscale looked natural and multiple formats are offered; those formats were not individually tested. |
| Original historical observation | 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. | 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. |
| Suitable uses · historical assessment | 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 | Users seeking clean, artifact-free 2x image enlargement with explicit DPI and format controls and zero registration friction |
| Result & output evidence | No native output obtained; the preview does not establish final export quality. | |
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 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. |
| Historical specification note · not an official maximum | 2048 × 2048 (true 4x lossless PNG export, supporting arbitrary large-image tiled inference) | 1024×1024 (Default 2x Mode) / Configurable Custom Target Dimensions |
| Watermark observation | Watermark-free | Watermark-Free |
| Batch & API | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size | Supports custom width/height/DPI settings and instant Delete Task |
| Recorded free-tier dimensions | 2048 × 2048 | Not verified |
| Attached file dimensions | 2048 × 2048 · PNG | Not verified |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 2.63s · End-to-end reference: 2.63s | Network-observed server wait: 11.2s · End-to-end reference: 11.6s |
| Date & fixture | 2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914) | 2026-10-19 · anchor_upscale_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | No login in this test | No login in this test |
| Sign-in methods | 100% usable without login (runs entirely in the local browser via WebGPU) | No login required |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | 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. | Provides direct Width, Height, DPI, and target image format selectors before starting, with a clean Download button on completion. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | nagadomi (waifu2x / nunif Open-Source Author) | QaamGo Web GmbH (Radolfzell, Germany) |
| Recorded origin | Independent open-source AI vision researcher (Japan) | Radolfzell, Germany |
| Domain history record | 2015–Present (waifu2x.net) | 2016–Present |
| Background & reputation assessment | Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | Operated by QaamGo Web GmbH (Radolfzell, Germany), the European team behind PDF2Go and Online-Convert. |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | On-device processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Not verified |
| Engineering & privacy assessment | 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | EU GDPR compliant with one-click Delete Task on the download screen and automatic 24-hour file purge. |
| Retention statement | This flow runs locally; post-close deletion not independently verified | Claims deletion within 24 hours; deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | 34 / 35 100% free and open-source in-browser WebGPU tool with zero paywalls, zero ad clutter, and no usage limits (01_landing.png, 02_workspace.png, 03_download.png). | 32 / 35 Promises 'Upscale Image · Free online tool' on the landing page (01_landing.png); in our anonymous test with the 512×512 degraded anchor, it exported a clean 1024×1024 (2x, 1.1 MB) unwatermarked PNG without login (02_result.png, 03_download.png). |
| Interaction restraint | 25 / 30 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. | 26.5 / 30 Provides direct Width, Height, DPI, and target image format selectors before starting, with a clean Download button on completion. |
| Background & reputation | 19 / 20 Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | 19 / 20 Operated by QaamGo Web GmbH (Radolfzell, Germany), the European team behind PDF2Go and Online-Convert. |
| Engineering & privacy | 14.5 / 15 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | 14 / 15 EU GDPR compliant with one-click Delete Task on the download screen and automatic 24-hour file purge. |
| Task quality | 57.2 / 65 PSNR vs 2048px GT: 28.34 dB · SSIM: 0.895 · Edge Gradient Correlation: 0.7165 · High-Freq Sharpness Ratio: 0.5256 · Calibration Plate PSNR: 17 dB | 55.2 / 65 Evaluated against the 2048×2048 Ground-Truth master: PSNR = 27.07 dB, SSIM = 0.8866, Sobel edge correlation = 0.6109, high-frequency ratio = 0.4743, and calibration plate PSNR = 15.52 dB (55.0/65) |
| Deliverable specifications | 20 / 20 Exports a full 2048×2048 4x upscaled PNG (or WebP/JPEG) locally in the browser with zero watermarks and no file-count limits (20.0/20) | 15 / 20 Exports a clean 1024×1024 (2.0x) RGB PNG (1.1 MB) without login or watermarks and supports custom output dimensions/formats (18.0/20) |
| Processing speed | 10.5 / 15 Local WebGPU hardware acceleration completes 512→2048 (4x) tiled inference in just 2.63s with zero network upload overhead (14.5/15) | |
