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 | Bigjpg | Nero AI | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 80/100 2000 × 2000 · PNG | Compare in task topic → |
| Image compression | Not tested in topic | 88/100 2048 × 2048 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 84/100 2048 × 2048 · PNG | Active task |
| Object removal | Not tested in topic | 77/100 2000 × 2000 · PNG | Compare in task topic → |
| Image generation | Not tested in topic | 91/100 1024 × 1024 · PNG | Compare in task topic → |
| Photo restoration | Not tested in topic | 79/100 JPEG · Output attached | 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 | Bigjpg (AI Super-Resolution Image Enlarger) Image upscaling 89/100 Seven-aspect task score Free login-free 4× output offers adjustable denoising and clear upgrade limits; detail is retained well, with about 18.5 seconds of free processing in this run. Tested export 2048 × 2048 · PNG Historical test · 2026-10-17 | Nero AI Image Upscaler Image upscaling 84/100 Seven-aspect task score Guest trials deliver detailed, watermark-free 4× output without login; only five free uses are available, with about 18 seconds of processing in this run. Tested export 2048 × 2048 · PNG Historical test · 2026-10-17 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | Bigjpg web and app plans (Free / Basic 2-month / Standard half-year / Pro annual); CNY · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-21 ↗ Free Free Free Available without login; 20 images/month, max 5 MB per file, up to 4x unwatermarked upscaling on shared servers. Basic (2 Months)2026-10-21 ↗ CNY 35 · one-time payment Usage / one-time Usage / one-time CNY 35 for 2 months (500 images/month); max 50 MB per image, up to 16x upscaling, dedicated high-performance server, and batch processing. Valid for 2 months from purchase Standard (6 Months)2026-10-21 ↗ CNY 69/6 months Other period Other period CNY 69 for 6 months (1,000 images/month); max 50 MB per image, up to 16x upscaling, dedicated high-performance server, and batch processing. Pro (1 Year)2026-10-21 ↗ — CNY 138/year Annual CNY 138 for 1 year (2,000 images/month); max 50 MB per image, up to 16x upscaling, dedicated high-performance server, and batch processing. 4 plan / billing-period records, all listed; — means that period is not recorded. The official pricing modal lists Free (20 images/month, max 5 MB, up to 4x upscaling) and three fixed-term tiers: Basic CNY 35 for 2 months (500 images/month), Standard CNY 69 for 6 months (1,000 images/month), and Pro CNY 138 for 1 year (2,000 images/month). All paid tiers unlock up to 16x upscaling, 50 MB upload size, priority high-performance servers, and batch processing via WeChat Pay, Alipay, or Stripe. Cancellation, sources & verification recordPurchased for fixed periods (2 months, 6 months, or 1 year) via WeChat Pay, Alipay, or Stripe under official Terms of Service. Bigjpg official website and pricing table modal ↗ · 2026-10-21 Capture 1 ↗ | Nero AI web plans (Free / Standard / Yearly promo / Business); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-21 ↗ Free Free Free 5 free guest runs without login; 10 one-time credits per registered account (max 1000×1000px upload, 5 images/batch; 2× costs 1 credit, 4× costs 2 credits). Standard Monthly (300 credits)2026-10-21 ↗ USD 21.95/month — Monthly 300 credits/month (promotional USD 21.95/month, regular USD 24.99/month); up to 4000×4000px upload, 30 images/batch, priority processing, and 8× upscaling. Standard Yearly (3,000 credits/yr)2026-10-21 ↗ — Annual price not verified Annual 3,000 credits/year; promotional banner displays USD 7.66/month equivalent. Public page displays only the 7.66 USD/month equivalent without showing the annual invoice total before login. Business2026-10-21 ↗ Contact sales Quoted Quoted Custom credits and pricing (up to 200 images/batch, highest priority, API processing, and dedicated server). 4 plan / billing-period records, all listed; — means that period is not recorded. The official pricing page and credit table state that guests get 5 free runs and registered Free accounts receive 10 one-time Nero Credits (Standard/Photo/Anime 2× costs 1 credit/image, 4× costs 2 credits/image, paid-only 8× costs 4 credits/image). Standard monthly is USD 21.95/month promotional (regular USD 24.99/month, 300 credits/month). The yearly promo banner displays only "7.66 USD per month" (3,000 credits/year) without printing the annual invoice total before login, so the annual total is marked unverified. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancel anytime by turning off auto-renewal in account settings (remaining credits expire at the end of the billing period); FAQ states refunds are not allowed once Nero Credits have been used. Nero AI official pricing, credit consumption table, and FAQ ↗ · 2026-10-21 Capture 1 ↗ |
| Free & trial allowance on the test date | Free tier allows 20 images/month up to 3000×3000px / 5MB at 2x or 4x with all 5 denoising levels and zero watermarks | 5 free guest upscales (supports 2x and 4x for inputs <=2000x2000px) |
| Cancellation & refunds | Purchased for fixed periods (2 months, 6 months, or 1 year) via WeChat Pay, Alipay, or Stripe under official Terms of Service. | Cancel anytime by turning off auto-renewal in account settings (remaining credits expire at the end of the billing period); FAQ states refunds are not allowed once Nero Credits have been used. |
| Disclosure of costs & limits | 8x and 16x options are transparently disabled in the settings modal before processing starts | Displays exact 512x512 -> 2048x2048 output dimensions before clicking Start |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 4× |
| Fixture findings | The tested 4× photo configuration produced smooth output with text retained; other settings remain untested. | This guest run produced a watermark-free 4× upscale; input size and free allowances remain limited. |
| Original historical observation | 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. | 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. |
| Suitable uses · historical assessment | Users wanting a no-login, zero-watermark 4x (2048px) upscaler with 5-level adjustable noise reduction for photos and illustrations | Users who want guest-free, unwatermarked 4x upscaling on small/medium images (<=2000px) with top-tier PSNR fidelity |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 2048 × 2048 · PNG · No watermark in test |
| Historical specification note · not an official maximum | 2048 × 2048 (Full 4x Unwatermarked PNG) | 2048 × 2048 (True 4.0x unwatermarked upscale) |
| Watermark observation | None (100% watermark-free) | No watermark |
| Batch & API | Multi-image queue, Windows/Mac desktop apps, and REST API | Supports batch upload, commercial API (/ai-api), and desktop software |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | 2048 × 2048 · PNG | 2048 × 2048 · PNG |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 18.5s · End-to-end reference: 20s | Network-observed server wait: 18.2s · End-to-end reference: 19.3s |
| Date & fixture | 2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914) | 2026-10-17 · 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 | No login required; optional account login for history sync and parallel high-speed queues | No login required for up to 5 images; login grants extra free credits |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | 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. | Grants guests 5 free upscales (via "View as a guest") and exports a full 2048x2048 unwatermarked PNG at 4x (03_download.png). |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Bigjpg Team | Nero AG |
| Recorded origin | Cross-Platform AI Super-Resolution Team (Launched 2017) | Karlsruhe, Germany |
| Domain history record | 2017–present (9+ years) | 1995–present |
| Background & reputation assessment | 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. | Flagship AI upscaler by Nero AG (Karlsruhe, Germany, founded 1995). |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Not verified |
| Engineering & privacy assessment | Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | Offers 5 specialized models (Photo, Anime, Standard, Iris, Reconstruct) and outputs a clean 2048x2048 unwatermarked blob. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | 33 / 35 Anonymous guests can upload the 512×512 test image and open the clean configuration modal (Artwork/Photo, 2x/4x free, 5 noise reduction levels: None/Low/Medium/High/Highest), with only 8x/16x grayed out and labeled "Upgrade for 8x/16x" (02_workspace.png, 03_download.png). | 30 / 35 The landing page (01_landing.png) states "Start free with Nero AI. Upscale low-resolution images by 2×, 4×, or 8×"; after uploading our 512x512 degraded anchor, the left panel clearly displays "Original 512 × 512 (0.3 MP) → Result (×4) 2048 × 2048 (4.2 MP)" while marking "×8 Unlock Now" as paid (02_workspace.png). |
| Interaction restraint | 28.5 / 30 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. | 26 / 30 Grants guests 5 free upscales (via "View as a guest") and exports a full 2048x2048 unwatermarked PNG at 4x (03_download.png). |
| Background & reputation | 18 / 20 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. | |
| Engineering & privacy | 13 / 15 Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | 13 / 15 Offers 5 specialized models (Photo, Anime, Standard, Iris, Reconstruct) and outputs a clean 2048x2048 unwatermarked blob. |
| Task quality | 56.5 / 65 4x Photo mode (Low noise reduction) exported a native 2048×2048 unwatermarked PNG achieving full-frame PSNR = 28.27 dB and SSIM = 0.9790, suppressing JPEG block artifacts while preserving clean structural geometry and color accuracy (56.5/65). | 55.4 / 65 Outstanding restoration on the 512x512 -> 2048x2048 (4.0x) benchmark: full-frame PSNR reaches 27.49 dB (Top 3 overall), SSIM = 0.8895, Edge Correlation = 0.6704, HF Ratio = 0.5213, and Calibration Plate PSNR = 16.24 dB with crisp text and metallic sheen (55.4/65) |
| Deliverable specifications | 20 / 20 Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (20.0/20). | 18 / 20 Because the 512x512 source is under Nero's 2000x2000px input cap, guests receive a true 2048x2048 (4.0x) unwatermarked PNG without login (18.0/20) |
| Processing speed | 10.5 / 15 Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). | 9 / 15 Guest queue 4x cloud super-resolution completes in ~18.20s (Pro tier advertises 3x faster priority) (9.0/15) |
