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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 | Let's Enhance | Switch / compare |
|---|---|---|---|
| Image upscaling | 89/100 2048 × 2048 · PNG | 76/100 2048×2048 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · Historical description; output not attached | Active task |
| Image generation | Not tested in topic | 80/100 2048×2048 (9.96 MB PNG · Bottom-left watermark on free credits) · Historical description; output not attached | 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 | Let's Enhance (Prime 4x Upscaler) Image upscaling 76/100 Seven-aspect task score 4× detail is good and the workspace is ad-free, but registration is required and trial-credit exports still carry a watermark not disclosed before signup. Tested export 2048×2048 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · Historical description; output not attached Historical test · 2026-10-16 |
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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 ↗ | Let’s Enhance personal subscription plans (Free Trial / Starter / Pro / Max); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Signup free allowance2026-10-21 ↗ Free trial Trial Trial 10 free credits upon signup (1 credit per upscaled image, 2 credits per AI generation; free-credit exports include watermark). Starter Monthly (100 credits)2026-10-21 ↗ USD 12/month — Monthly 100 credits/month (unused credits roll over up to 600 credits); upscaling up to 256 MP, AI art generation, and watermark-free export. Starter Annual (100 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 100 credits/month (accumulate up to 600 credits); card displays USD 9/month equivalent billed annually. Public card displays only the USD 9/month equivalent ("Billed annually") without showing the annual invoice total before login. Pro Monthly (300 credits)2026-10-21 ↗ USD 32/month — Monthly 300 credits/month (unused credits roll over up to 1,800 credits); upscaling up to 350 MP, AI art generation, and watermark-free export. Pro Annual (300 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 300 credits/month (accumulate up to 1,800 credits); card displays USD 24/month equivalent billed annually. Public card displays only the USD 24/month equivalent ("Billed annually") without showing the annual invoice total before login. Max Monthly (500 credits)2026-10-21 ↗ USD 45/month — Monthly 500 credits/month (unused credits roll over up to 3,000 credits); upscaling up to 512 MP, AI art generation, and watermark-free export. Max Annual (500 credits/mo)2026-10-21 ↗ — Annual price not verified Annual 500 credits/month (accumulate up to 3,000 credits); card displays USD 34/month equivalent billed annually. Public card displays only the USD 34/month equivalent ("Billed annually") without showing the annual invoice total before login. 7 plan / billing-period records, all listed; — means that period is not recorded. The official pricing page and FAQ list personal monthly prices: Starter USD 12/month (100 credits/month), Pro USD 32/month (300 credits/month), and Max USD 45/month (500 credits/month), with unused credits rolling over up to 6x the monthly allowance. Annual cards display only monthly equivalents (USD 9 / 24 / 34 per month, "Billed annually") without printing the annual invoice total on the public page, so annual totals are marked unverified. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancel anytime via the Cancel Subscription button on the Pricing page; remaining unused credits expire at the end of the paid billing period. Purchasing any plan or bundle unlocks watermark-free downloads for previously processed images. Let’s Enhance official pricing and credit rules 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 | New accounts receive 10 free credits (1 credit per upscale; 9 credits left after test); removing the watermark and unlocking 8x/16x require a paid subscription |
| 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 via the Cancel Subscription button on the Pricing page; remaining unused credits expire at the end of the paid billing period. Purchasing any plan or bundle unlocks watermark-free downloads for previously processed images. |
| Disclosure of costs & limits | 8x and 16x options are transparently disabled in the settings modal before processing starts | Watermark appears only on the generated thumbnail and downloaded file after signup and processing |
| 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. | Text was clear in this 4× output; the free-credit image carried a brand watermark. |
| 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. | PSNR=27.02dB · SSIM=0.8631 (4x 2048×2048 Prime model); outstanding edge_corr=0.7108, hf_ratio=0.7910, and plate_psnr=17.25dB with razor-sharp 'REALTEST 2026' and 'REALTEST 2048px GT' typography, though free-credit exports include a bottom-left Let's Enhance watermark. |
| Suitable uses · historical assessment | Users wanting a no-login, zero-watermark 4x (2048px) upscaler with 5-level adjustable noise reduction for photos and illustrations | Print and design professionals who need ultra-crisp 4x–16x texture restoration and are willing to subscribe to remove the watermark |
| 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 | 2048×2048 (JPG · 4.0x Prime Upscale · Bottom-left watermark) · 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) | 2048×2048 (4.0x · Free tier unlocks 1x/2x/4x; 8x/16x require paid plan) |
| Watermark observation | None (100% watermark-free) | Free-credit exports carry a semi-transparent 'Let's Enhance .io' logo in the bottom-left corner |
| Batch & API | Multi-image queue, Windows/Mac desktop apps, and REST API | Supports multi-image batch queues (up to 50MB/file) and enterprise Claid.ai API |
| 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: 20.1s · End-to-end reference: 22.2s |
| Date & fixture | 2026-10-17 · anchor_upscale_v1 · US-West (California, AS2914) | 2026-10-16 · 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 | Account required in this test |
| Sign-in methods | No login required; optional account login for history sync and parallel high-speed queues | Mandatory Google or Email registration at /signup after selecting a file |
| 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. | Uses an 'upload-first, signup-gate-second' funnel, though it preserves the uploaded image in the `/boost` queue after login; workspace is clean and ad-free. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Bigjpg Team | Let's Enhance Inc. (San Francisco, CA, USA) |
| Recorded origin | Cross-Platform AI Super-Resolution Team (Launched 2017) | San Francisco, USA (Ukrainian-founded team) |
| Domain history record | 2017–present (9+ years) | 2017–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 Let's Enhance Inc. (founded 2017, San Francisco, CA, Techstars alum), one of the earliest commercial deep-learning super-resolution platforms. |
| 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. | Provides multi-model SR controls (Prime, Gentle, Old photo, Light AI) and 1x–16x scale factors over a stable cloud queue. |
| 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). | 18 / 35 The home page (Screenshot ①) presents a drag-and-drop uploader that immediately redirects to `/signup` promising 'Get started with 10 images free' (Screenshot ④); signing in via Google grants 10 credits and unlocks Prime 4x (2048×2048), but the exported 2048×2048 JPG embeds a semi-transparent 'Let's Enhance .io' watermark in the bottom-left corner (Screenshot ③) that was not disclosed on the signup page. |
| 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. | 21 / 30 Uses an 'upload-first, signup-gate-second' funnel, though it preserves the uploaded image in the `/boost` queue after login; workspace is clean and ad-free. |
| 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. | 18 / 20 Operated by Let's Enhance Inc. (founded 2017, San Francisco, CA, Techstars alum), one of the earliest commercial deep-learning super-resolution platforms. |
| Engineering & privacy | 13 / 15 Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. | 13 / 15 Provides multi-model SR controls (Prime, Gentle, Old photo, Light AI) and 1x–16x scale factors over a stable cloud queue. |
| 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). | 59 / 65 PSNR vs 2048px GT: 27.02 dB · SSIM: 0.8631 · Edge Gradient Correlation: 0.7108 · High-Freq Sharpness Ratio: 0.791 · Calibration Plate PSNR: 17.25 dB |
| Deliverable specifications | 20 / 20 Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (20.0/20). | 12 / 20 No free unwatermarked export (0/8); Free scale factor: 4x (2048×2048 (4.0x · Free tier unlocks 1x/2x/4x; 8x/16x require paid plan)) |
| Processing speed | 10.5 / 15 Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). | 8 / 15 Network-observed server wait: 20.1s (API mode: async_poll; end-to-end 22.2s shown for reference only, never penalized) |
