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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 | birme.net | Unlimited:Waifu2x | Switch / compare |
|---|---|---|---|
| Image compression | 83/100 512 × 512 · PNG | Not tested in topic | Compare in task topic → |
| Image upscaling | 94/100 2048 × 2048 · PNG | 89/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | BIRME Image upscaling 94/100 Seven-aspect task score BIRME is one of the rare free tools that runs AI super-resolution entirely client-side via in-browser WebGPU/WASM without requiring an account. In our live test, it upscaled a 1024px input to a full 2048x2048 watermark-free native PNG in 60.3s, achieving an edge correlation of 0.6668 that significantly outperforms traditional bicubic interpolation while providing uncompromising zero-upload privacy. Tested export 2048 × 2048 · PNG Historical test · 2026-11-01 | Unlimited:Waifu2x (WebGPU In-Browser SR) Image upscaling 89/100 Seven-aspect task score Free open-source, login-free on-device processing gives good 4× detail; a dismissible rewarded-ad prompt may appear on first use. Tested export 2048 × 2048 · PNG Historical test · 2026-10-17 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | BIRME 100% free client-side batch image processing and compression · 2026-11-01 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-11-01 ↗ Free Free Free Completely free without login; unlimited batch image processing constrained only by client memory Smart crop, format conversion (JPG/PNG/WebP/AVIF), quality compression, watermark, AI background removal and upscaling；Pure client-side execution; very large batches may consume significant browser memory；Permanently free, no renewal；Perpetual access 1 plan / billing-period records, all listed; — means that period is not recorded. All batch resizing, compression, AI background removal, and upscaling are 100% free with voluntary donation support and zero paid plans. Cancellation, sources & verification recordCancellation and refund terms unverified BIRME Official Studio ↗ · 2026-11-01 Capture 1 ↗ | unlimited:waifu2x in-browser AI image upscaler · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits unlimited:waifu2x Free Web2026-10-21 ↗ Free Free Free Free without login and no image-count limits (runs on local WebGPU/WASM hardware); supports up to 4x unwatermarked PNG export. 1 plan / billing-period records, all listed; — means that period is not recorded. In-browser WebGPU/WebAssembly upscaler powered by nunif/waifu2x. Completely free with no account system or paid tiers; offers swin_unet and cunet models, 1x/2x/4x upscaling, and denoise levels running on local device hardware. Cancellation, sources & verification recordCompletely free open-source-powered tool with no accounts or subscription charges. unlimited:waifu2x official page ↗ · 2026-10-21 Capture 1 ↗ |
| Free & trial allowance on the test date | Completely free, no quota limits, pure client-side WebGPU processing | Unlimited local WebGPU runs with zero daily caps or credit deductions |
| Cancellation & refunds | Not verified | Completely free open-source-powered tool with no accounts or subscription charges. |
| Disclosure of costs & limits | Page transparently outlines all resizing and AI enhancement parameters | Explicitly discloses WebGPU browser requirements and model options at the top of the page |
| Task quality | ||
| Measured fixture results | Tested scale: 4× | Tested scale: 4× |
| Fixture findings | Under the 2048px standard anchor, BIRME's local WebGPU super-resolution outputs a 2048x2048 native PNG with 26.97 dB PSNR, 0.8897 SSIM, 0.6668 edge correlation (+17.9% over bicubic baseline), and 16.08 dB plate PSNR, completing in 60.3s purely offline on the client. | Ran 4× upscaling locally with noise reduction and text retention; speed depends on the device. |
| Original historical observation | BIRME AI Enhance runs purely offline via browser WebGPU/WASM, upscaling 1024x1024 to 2048x2048 with an edge correlation of 0.6668, delivering significantly better detail than bicubic interpolation. | Waifu2x Unlimited (Swin-UNet Photo 4x) suppresses JPEG compression artifacts cleanly while preserving natural camera gradients (PSNR 28.34 dB, SSIM 0.895) in 2.63s via WebGPU, without introducing fake generative hallucinations. |
| Suitable uses · historical assessment | Users needing no-login, 100% private, client-side AI image super-resolution without uploading files to external servers | Privacy-conscious users, anime/illustration and natural photo creators who want 100% free, unlimited 4x local GPU super-resolution without uploading files to any cloud server |
| 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 (PNG · 4.0x full-resolution direct export) | 2048 × 2048 (true 4x lossless PNG export, supporting arbitrary large-image tiled inference) |
| Watermark observation | No watermark | Watermark-free |
| Batch & API | Supports arbitrary batch processing limited only by local device memory and GPU VRAM | Supports multi-model switching (Swin-UNet Art / Art Scan / Photo), 4-level denoise, and configurable tile size |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | 2048 × 2048 · PNG | 2048 × 2048 · PNG |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 60.34s · End-to-end reference: 60.34s | Recorded local processing time: 2.63s · End-to-end reference: 2.63s |
| Date & fixture | 2026-11-01 · 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 | All features available directly without registration or login | 100% usable without login (runs entirely in the local browser via WebGPU) |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Pure single-page engineering workbench: select model (Swin-UNet Art / Photo), Denoise level, and 1x/2x/4x scale, then immediately preview or download the 2048×2048 PNG. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | BIRME Project | nagadomi (waifu2x / nunif Open-Source Author) |
| Recorded origin | United Kingdom | Independent open-source AI vision researcher (Japan) |
| Domain history record | Founded in 2013 | 2015–Present (waifu2x.net) |
| Background & reputation assessment | Not verified | Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. |
| External reputation record | Continuously operating for 13 years since 2013, renowned for pure client-side privacy. | Not verified |
| Engineering & privacy | ||
| Processing location | On-device processing | On-device processing |
| Third-party tracking record | Google Analytics | Not verified |
| Engineering & privacy assessment | Not verified | 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. |
| Retention statement | This flow runs locally; post-close deletion not independently verified | This flow runs locally; post-close deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | 34 / 35 100% free and open-source in-browser WebGPU tool with zero paywalls, zero ad clutter, and no usage limits (01_landing.png, 02_workspace.png, 03_download.png). | |
| Interaction restraint | 25 / 30 Pure single-page engineering workbench: select model (Swin-UNet Art / Photo), Denoise level, and 1x/2x/4x scale, then immediately preview or download the 2048×2048 PNG. | |
| Background & reputation | 19 / 20 Authored and maintained by nagadomi, the creator of the iconic Waifu2x open-source repository and the nunif deep-learning framework. | |
| Engineering & privacy | 14.5 / 15 100% local in-browser WebGPU / ONNX Runtime inference — user images never leave the local device, offering maximum privacy protection. | |
| Task quality | 60.5 / 65 PSNR vs 2048px GT: 26.97 dB · SSIM: 0.8897 · Edge Gradient Correlation: 0.6668 · High-Freq Sharpness Ratio: 0.5048 · Calibration Plate PSNR: 16.08 dB | 57.2 / 65 PSNR vs 2048px GT: 28.34 dB · SSIM: 0.895 · Edge Gradient Correlation: 0.7165 · High-Freq Sharpness Ratio: 0.5256 · Calibration Plate PSNR: 17 dB |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Free scale factor: 4x (2048 × 2048 (PNG · 4.0x full-resolution direct export)) | 20 / 20 Exports a full 2048×2048 4x upscaled PNG (or WebP/JPEG) locally in the browser with zero watermarks and no file-count limits (20.0/20) |
| Processing speed | 12 / 15 Network-observed server wait: 60.34s (API mode: client_side; end-to-end 60.34s shown for reference only, never penalized) | 10.5 / 15 Local WebGPU hardware acceleration completes 512→2048 (4x) tiled inference in just 2.63s with zero network upload overhead (14.5/15) |
