Bigjpg (AI Super-Resolution Image Enlarger) · Image upscaling
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.
US-West (California, AS2914)
2048 × 2048 · PNG · Open native file ↗
Subsequent pricing and service checks are shown separately without altering historical scores.
One run does not establish all complex scenes, untested paid maxima or long-term uptime.
Plans & historical pricing
Bigjpg web and app plans (Free / Basic 2-month / Standard half-year / Pro annual); CNY · 2026-10-21
Valid for 2 months from purchase
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 record
Purchased 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 ↗
Pricing recorded on the test date · 2026-10-17
Free for 2x/4x unwatermarked export; Basic ~$6 / 2 months (500 images/mo, 8x/16x), Standard ~$12 / 6 months, Pro ~$22 / 12 months
Fixed-term passes (no forced auto-renewal traps) + Developer API
Historical context only; not current purchase guidance.
Delivery & access
- Free delivery record
- 2048 × 2048 (Full 4x Unwatermarked PNG)
- Attached file dimensions
- 2048 × 2048 · PNG
Read directly from the attached file; this does not establish free download availability at that size.
- Watermark
- None (100% watermark-free)
- Free allowance
- Free tier allows 20 images/month up to 3000×3000px / 5MB at 2x or 4x with all 5 denoising levels and zero watermarks
- Account requirements
- No login required; optional account login for history sync and parallel high-speed queues
- Maximum specification record
- 2048 × 2048 (Full 4x Unwatermarked PNG)
May include advertised capabilities; this does not establish a tested paid tier.
- Batch & API
- Multi-image queue, Windows/Mac desktop apps, and REST API
- Manual refinement
- Not recorded or not verified
Tested result & sample
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.
- Fixture
- anchor_upscale_v1
- Recorded environment
- US-West (California, AS2914)
- Network-observed server wait
- 18.5 s
- End-to-end reference
- 20 s
Network wait includes round trips, queuing and polling error, not pure inference time. Local timings depend on the device; repetition counts are not standardized in legacy records.
Experience, rules & trust
- Disclosure
- 8x and 16x options are transparently disabled in the settings modal before processing starts
- Interaction
- 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.
- Entity record
- Bigjpg Team
- Origin
- Cross-Platform AI Super-Resolution Team (Launched 2017)
- Domain history record
- 2017–present (9+ years)
- Third-party tracking record
- Not recorded or not verified
- External information
- Not recorded or not verified
- Processing
- Cloud Deep Convolutional Neural Networks (Waifu2x / SRCNN) + direct CDN delivery
- Retention statement
- Temporary cloud cache with an instant on-page Delete button
A recorded statement does not verify deletion or all data-processing behavior.
Verifiable audit trail & evidence
Four SHA-256-verified stages link the benchmark fixture, same-run interface screenshots, native exported artifact and archived pricing sources.
anchor_upscale_v1 · Inspect fixture & file inspector →
Captures entry rules, result view and export disclosure.
Bigjpg official website and pricing table modal (snapshot ↗)
Screenshots, native output and official claims support different conclusions. Evidence grades are not product safety certifications.
Evaluation basis & full scores · Overall 88.7/100
Overall = honesty & reputation × 30% + capability × 70%. Component maxima follow this report’s rubric. List scores are rounded for display; original precision is retained here.
Scoring version 2.3.1 · Test fixture anchor_upscale_v1
Honesty & reputation · 92.5/100 · 30%
| Criterion | Score | Rationale | 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). | Evidence A → |
| 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. | Evidence A → |
| 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. | Evidence A → |
| Engineering & privacy | 13 / 15 | Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | Evidence A → |
Capability · 87/100 · 70%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| 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). | Evidence A → |
| Deliverable specifications | 20 / 20 | Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (20.0/20). | Evidence A → |
| Processing speed | 10.5 / 15 | Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). | Evidence A → |
Legacy scores may include advertised maximum capabilities. Read tested output separately from paid capabilities. Records without matching tiers and scope are not ranked together.
Revisions & corrections
- 2026-10-17
Completed real-machine benchmark evaluation and 3-node screenshot verification under RealTest Protocol v2.3. - 2026-10-19
Completed real-machine benchmark evaluation and 3-node screenshot verification under RealTest Protocol v2.3.