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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 | 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 → |
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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 | 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 | 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 ↗ | 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 | Free tier allows 20 images/month up to 3000×3000px / 5MB at 2x or 4x with all 5 denoising levels and zero watermarks | Free visitors can upscale images and download unwatermarked PNGs without creating an account |
| Cancellation & refunds | Purchased for fixed periods (2 months, 6 months, or 1 year) via WeChat Pay, Alipay, or Stripe under official Terms of Service. | Page advertises a 14-day money-back guarantee and cancellation anytime; eligibility is subject to terms. |
| Disclosure of costs & limits | 8x and 16x options are transparently disabled in the settings modal before processing starts | Displays target format, dimension, and DPI controls upfront before processing |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Not verified |
| Fixture findings | The tested 4× photo configuration produced smooth output with text retained; other settings remain untested. | The tested upscale looked natural and multiple formats are offered; those formats were not individually tested. |
| 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. | 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 | Users wanting a no-login, zero-watermark 4x (2048px) upscaler with 5-level adjustable noise reduction for photos and illustrations | 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 (Full 4x Unwatermarked PNG) | 1024×1024 (Default 2x Mode) / Configurable Custom Target Dimensions |
| Watermark observation | None (100% watermark-free) | Watermark-Free |
| Batch & API | Multi-image queue, Windows/Mac desktop apps, and REST API | 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 | Network-observed server wait: 18.5s · End-to-end reference: 20s | 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 | No login required; optional account login for history sync and parallel high-speed queues | No login required |
| 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. | 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 | Bigjpg Team | QaamGo Web GmbH (Radolfzell, Germany) |
| Recorded origin | Cross-Platform AI Super-Resolution Team (Launched 2017) | Radolfzell, Germany |
| Domain history record | 2017–present (9+ years) | 2016–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. | 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 | 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. | EU GDPR compliant with one-click Delete Task on the download screen and automatic 24-hour file purge. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Claims deletion within 24 hours; deletion not independently verified |
| 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). | 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 | 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. | 26.5 / 30 Provides direct Width, Height, DPI, and target image format selectors before starting, with a clean Download button on completion. |
| 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. | 19 / 20 Operated by QaamGo Web GmbH (Radolfzell, Germany), the European team behind PDF2Go and Online-Convert. |
| Engineering & privacy | 13 / 15 Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | 14 / 15 EU GDPR compliant with one-click Delete Task on the download screen and automatic 24-hour file purge. |
| 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). | 55.2 / 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 Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (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 Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). | |
