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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 | DeWatermark | Switch / compare |
|---|---|---|---|
| Background removal | Not tested in topic | 76/100 1280 × 1280 · PNG | Compare in task topic → |
| Image upscaling | 89/100 2048 × 2048 · PNG | 81/100 1024 × 1024 · PNG | Active task |
| Object removal | Not tested in topic | 74/100 1280 × 1280 · 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 | DeWatermark Image Enhancer (AI Upscaler) Image upscaling 81/100 Seven-aspect task score Login-free 2× output is clean and watermark-free with clear tiers and credit costs; 4× needs Pro rather than free access. Tested export 1024 × 1024 · PNG Historical test · 2026-10-17 |
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| 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 ↗ | Basic web removal and related Pro/credit offers · 2026-10-20 Plan · source date Monthly / one-time Annual bill / period Quota & limits Basic background removal2026-10-20 ↗ Free Free Free Feature page describes free basic removal without watermarks; input up to 5MB Pricing card says 3 daily credits, FAQ says 2; these describe watermark-service credits Pro Pack 12K2026-10-20 ↗ — USD 120/year Annual Selected tier: 12,000 credits; credit table concerns watermark processing Removal feature page lists HD and batch under Pro; input up to 10MB；Unused credits expire at membership end; no automatic renewal 100 credits2026-10-20 ↗ USD 7 · one-time payment Usage / one-time Usage / one-time 100 cross-tool credits; removal cost unspecified Rules [1] 500 credits2026-10-20 ↗ USD 18 · one-time payment Usage / one-time Usage / one-time 500 cross-tool credits; removal cost unspecified Rules [1] 1,000 credits2026-10-20 ↗ USD 25 · one-time payment Usage / one-time Usage / one-time 1,000 cross-tool credits; removal cost unspecified Rules [1] 5,000 credits2026-10-20 ↗ USD 80 · one-time payment Usage / one-time Usage / one-time 5,000 cross-tool credits; removal cost unspecified Rules [1] 10,000 credits2026-10-20 ↗ USD 120 · one-time payment Usage / one-time Usage / one-time 10,000 cross-tool credits; removal cost unspecified Rules [1] 25,000 credits2026-10-20 ↗ USD 250 · one-time payment Usage / one-time Usage / one-time 25,000 cross-tool credits; removal cost unspecified Rules [1] 50,000 credits2026-10-20 ↗ USD 450 · one-time payment Usage / one-time Usage / one-time 50,000 cross-tool credits; removal cost unspecified Rules [1] 100,000 credits2026-10-20 ↗ USD 800 · one-time payment Usage / one-time Usage / one-time 100,000 cross-tool credits; removal cost unspecified Rules [1] 18 plan / billing-period records, all listed; — means that period is not recorded. All four monthly/annual volumes are verified using purchase-button totals (6,000 annual credits cost $90, despite a rounded $8 monthly label). The free card states 3 daily credits but other free statements conflict, so a single free allowance is unconfirmed. The 1/3-credit rules concern watermark removal, not a separately stated background-removal rate. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordNo automatic renewal; the FAQ states no refund policy, with support available for payment issues. Official plans and usage terms ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ All Pro volumes and billing periods ↗ · 2026-10-20 Capture 1 ↗ · Capture 2 ↗ · Capture 3 ↗ · Capture 4 ↗ · Capture 5 ↗ · Capture 6 ↗ · Capture 7 ↗ · Capture 8 ↗ |
| 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 anonymous 2X upscaling (up to 2800px) and unwatermarked 1024×1024 export; 4X upscaling requires Pro |
| Cancellation & refunds | Purchased for fixed periods (2 months, 6 months, or 1 year) via WeChat Pay, Alipay, or Stripe under official Terms of Service. | No automatic renewal; the FAQ states no refund policy, with support available for payment issues. |
| Disclosure of costs & limits | 8x and 16x options are transparently disabled in the settings modal before processing starts | Scale selector explicitly displays '2X | Max 2800px' and '4X PRO' |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 2× |
| Fixture findings | The tested 4× photo configuration produced smooth output with text retained; other settings remain untested. | Denoising and text edges were retained; the tested free tier was limited to 2× at 1024px. |
| 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. | 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. |
| 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 high-PSNR, artifact-free 2x image enhancement without login or watermarks |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 1024 × 1024 · PNG · No watermark in test |
| Historical specification note · not an official maximum | 2048 × 2048 (Full 4x Unwatermarked PNG) | 1024 × 1024 (2X Unwatermarked) |
| Watermark observation | None (100% watermark-free) | Watermark-free |
| Batch & API | Multi-image queue, Windows/Mac desktop apps, and REST API | Supports Batch Enhance Photo and REST API |
| Recorded free-tier dimensions | 2048 × 2048 | 1024 × 1024 |
| Attached file dimensions | 2048 × 2048 · PNG | 1024 × 1024 · PNG |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 18.5s · End-to-end reference: 20s | Network-observed server wait: 8.1s · End-to-end reference: 9.5s |
| 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; optional email/Google login |
| 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. | No signup or watermark on the 2X (1024×1024) export; only selecting 4X triggers the Pro upgrade modal. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Bigjpg Team | XTeam (DeWatermark.ai) |
| Recorded origin | Cross-Platform AI Super-Resolution Team (Launched 2017) | Global AI Vision Team (XTeam) |
| Domain history record | 2017–present (9+ years) | 2023–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 XTeam (DeWatermark.ai) with both single-image and Batch Enhance Photo modes. |
| 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. | Lossless 512×512 upload with 60-minute automatic cloud cleanup. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Claims deletion within 60 minutes; 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). | 28 / 35 Uploads the 512×512 anchor and automatically completes 2X upscaling (1024×1024) without login; clearly labels '2X (2 credits)' vs '4X PRO (4 credits)' and allows free unwatermarked 1024×1024 download (02_workspace.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. | 25 / 30 No signup or watermark on the 2X (1024×1024) export; only selecting 4X triggers the Pro upgrade modal. |
| 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. | 17.5 / 20 Operated by XTeam (DeWatermark.ai) with both single-image and Batch Enhance Photo modes. |
| Engineering & privacy | 13 / 15 Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | |
| 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). | 53.5 / 65 2X super-resolution (512→1024) achieved full-frame PSNR = 27.12 dB, wooden sign ROI plate_psnr_db = 30.46 dB, SSIM = 0.9711, and edge_corr = 0.6117 with zero ringing artifacts (53.5/65). |
| Deliverable specifications | 20 / 20 Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (20.0/20). | 15.5 / 20 Free tier exports 2X (1024×1024, max 2800px) without watermark; 4X requires Pro (15.5/20). |
| Processing speed | 10.5 / 15 Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). | |
