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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 | images-upscale.com | Bigjpg | Switch / compare |
|---|---|---|---|
| Image upscaling | 92/100 2048 × 2048 · PNG | 89/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | Images-Upscale.com Image upscaling 92/100 Seven-aspect task score Grants 2 free daily guest credits without login—enough to directly export a true 4x (2048×2048) watermark-free native PNG in 7.49s server time with sharp edge and text restoration (16.23 dB plate PSNR). Tested export 2048 × 2048 · PNG Historical test · 2026-10-26 | 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 |
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| Pricing & rules | ||
| Pricing plans | Images Upscale daily free credits and one-time non-expiring credit packs (USD) · 2026-10-26 Plan · source date Monthly / one-time Annual bill / period Quota & limits Daily Free Allowance2026-10-26 ↗ Free Free Free 2 free credits daily (no login required): covers two 2× upscales or one 4× upscale per day, up to 25 MB per image, watermark-free export. Starter Pack2026-10-26 ↗ USD 9.99 · one-time payment Usage / one-time Usage / one-time 110 credits (100 + 10 bonus, ~9.1¢/credit), good for 110 2× or 55 4× upscales; credits never expire. Pro Pack2026-10-26 ↗ USD 19.99 · one-time payment Usage / one-time Usage / one-time 360 credits (300 + 60 bonus, ~5.6¢/credit), good for 360 2× or 180 4× upscales; credits never expire. Studio Pack2026-10-26 ↗ USD 49.99 · one-time payment Usage / one-time Usage / one-time 1,300 credits (1,000 + 300 bonus, ~3.8¢/credit), good for 1,300 2× or 650 4× upscales; credits never expire. 4 plan / billing-period records, all listed; — means that period is not recorded. Guests and signed-in users receive 2 free credits daily (1 credit per 2x upscale, 2 credits per 4x upscale); paid packs are one-time purchases with no subscription auto-renewal and credits never expire. Cancellation, sources & verification recordOne-time credit packs only with no recurring subscriptions; support available via support@images-upscale.com. Images Upscale official pricing page and free credit allowance ↗ · 2026-10-26 Capture 1 ↗ · Capture 2 ↗ | 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 ↗ |
| Free & trial allowance on the test date | Guests receive 2 free daily credits without login (enough for one free 4x upscale or two 2x upscales); registering a free account grants 5 additional first-month credits | Free tier allows 20 images/month up to 3000×3000px / 5MB at 2x or 4x with all 5 denoising levels and zero watermarks |
| Cancellation & refunds | One-time credit packs only with no recurring subscriptions; support available via support@images-upscale.com. | Purchased for fixed periods (2 months, 6 months, or 1 year) via WeChat Pay, Alipay, or Stripe under official Terms of Service. |
| Disclosure of costs & limits | Upload panel upfront displays remaining free credits (2 free credits remaining today) and credit cost per scale factor | 8x and 16x options are transparently disabled in the settings modal before processing starts |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 4× |
| Fixture findings | 4x upscaling of the 512×512 anchor to a native 2048×2048 PNG achieved 27.42 dB PSNR, 0.8876 SSIM, 0.6652 edge_corr, and 16.23 dB calibration plate PSNR with crisp lettering and line pairs. | The tested 4× photo configuration produced smooth output with text retained; other settings remain untested. |
| Original historical observation | Uploading the 512×512 degraded anchor without login and selecting 4x produced a native 2048×2048 watermark-free PNG in 7.49s server time (PSNR = 27.42 dB, SSIM = 0.8876, edge_corr = 0.6652, plate_psnr_db = 16.23 dB) with sharp wooden sign text and micro calibration lines (02_workspace.png, 03_download.png). | 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. |
| Suitable uses · historical assessment | Everyday users seeking login-free, true 4x (2048×2048) watermark-free native PNG exports with strong edge sharpness and text restoration | Users wanting a no-login, zero-watermark 4x (2048px) upscaler with 5-level adjustable noise reduction for photos and illustrations |
| 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 (4x watermark-free native PNG, 3.35 MB) | 2048 × 2048 (Full 4x Unwatermarked PNG) |
| Watermark observation | Completely watermark-free (native 2048×2048 PNG export) | None (100% watermark-free) |
| Batch & API | Supports up to 10x upscaling, portrait restoration, and background removal modes; Pro plan supports up to 20-image batch processing | Multi-image queue, Windows/Mac desktop apps, and REST API |
| 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: 7.49s · End-to-end reference: 9.61s | Network-observed server wait: 18.5s · End-to-end reference: 20s |
| Date & fixture | 2026-10-26 · 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 for 2x and 4x upscaling; also supports Google / Email sign-in | No login required; optional account login for history sync and parallel high-speed queues |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Zero popup ads or forced sign-in walls; once upscaling finishes, an interactive Before/After comparison slider and direct download button appear immediately on the same page. | 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. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Images-Upscale.com (Independent AI Upscaling Team) | Bigjpg Team |
| Recorded origin | Undisclosed jurisdiction (Cloudflare edge + cloud GPU inference) | Cross-Platform AI Super-Resolution Team (Launched 2017) |
| Domain history record | 2026–Present | 2017–present (9+ years) |
| Background & reputation assessment | Independent AI image upscaling service launched in 2026 with clear terms, privacy documentation, and support email, though without a disclosed corporate entity name. | 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. |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Uploaded for cloud processing |
| Third-party tracking record | Google Analytics (G-0DP889885P) | Not verified |
| Engineering & privacy assessment | Submits jobs via POST /api/tasks/upscale backed by Cloudflare R2 and cloud Real-ESRGAN GPU inference (7.49s server time, 2.94s upload time); the privacy policy states guest images are retained only temporarily and purged automatically after ~1 hour. | Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. |
| Retention statement | Claims deletion within 1 hours; deletion not independently verified | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | 32.5 / 35 The landing page (01_landing.png) and pricing page clearly disclose free quotas (2 daily free guest credits without login, plus 5 bonus credits for new registered accounts) and credit costs (1 credit for 2x, 2 credits for 4x); in our no-login test, selecting 4x on the 512×512 anchor consumed 2 guest credits and exported a 2048×2048 watermark-free native PNG directly (02_workspace.png, 03_download.png). | 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). |
| Interaction restraint | 28 / 30 Zero popup ads or forced sign-in walls; once upscaling finishes, an interactive Before/After comparison slider and direct download button appear immediately on the same page. | 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. |
| Background & reputation | 14.5 / 20 Independent AI image upscaling service launched in 2026 with clear terms, privacy documentation, and support email, though without a disclosed corporate entity name. | 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 Submits jobs via POST /api/tasks/upscale backed by Cloudflare R2 and cloud Real-ESRGAN GPU inference (7.49s server time, 2.94s upload time); the privacy policy states guest images are retained only temporarily and purged automatically after ~1 hour. | 13 / 15 Supports offline queue recovery and one-click "Delete" to immediately purge uploaded/upscaled files from cloud storage. |
| Task quality | 62 / 65 Pixel fidelity (23.5/25: 512×512 anchor upscaled 4x to 2048×2048 with PSNR = 27.42 dB and SSIM = 0.8876) · Edge & high-frequency recovery (24.5/25: edge_corr = 0.6652, hf_ratio = 0.5259, crisp high-frequency edge reconstruction) · Calibration plate & micro-text (14.0/15: plate_psnr_db = 16.23 dB, sharp wooden sign and calibration plate lettering) (62.0/65) | 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). |
| Deliverable specifications | 20 / 20 2 daily free guest credits allow direct 4x selection and export of a native 2048×2048 watermark-free PNG (3,517,417 bytes) without login (20.0/20) | 20 / 20 Free guest tier directly exports full 4x (2048×2048) unwatermarked PNG (20.0/20). |
| Processing speed | 12 / 15 Verified via task API timestamps: 7.49s server 4x upscaling inference from createdAt (10:25:37.315Z) to completedAt (10:25:44.805Z), with 2.94s upload and 9.61s end-to-end (12.0/15) | 10.5 / 15 Free cloud GPU 4x Photo super-resolution completed in ~18.5s (10.5/15). |
