Free AI Image Upscaler
Enlarge photos 2×, 4× or 8× and restore detail with Real-ESRGAN. Runs on your device — no sign-up, no watermark, nothing uploaded.
Next: put this photo on a new background with the background changer, restyle a room with interior design AI, or turn a product shot into a studio scene with phone photo to studio. First result free.
The AI model (about 5 MB) downloads once the first time you upscale. 8× = AI 4× plus a smooth 2× resize. Maximum result about 16 megapixels.
Real result: bicubic vs AI upscaling
The same 400 px photo enlarged 4×. Left: standard bicubic resize. Right: Real-ESRGAN in this tool. Drag the handle.
Bicubic 4×AI 4×Keepframe's free AI image upscaler enlarges JPG, PNG or WebP images 2×, 4× or 8× using the open-source Real-ESRGAN general-x4v3 model. It runs entirely in your browser, so there is no sign-up, no credits, no daily limit and no watermark, and your image is never uploaded. Results go up to about 16 megapixels and download as PNG.
Facts checked October 10, 2026.
What you get
| Price | Free. No credits, no sign-up, no daily limit. |
|---|---|
| Watermark | None. |
| Privacy | Runs in your browser; the image is never uploaded. |
| Model | Real-ESRGAN general-x4v3 (open source, BSD-3) via onnxruntime-web; WebGPU when available, otherwise WebAssembly. |
| Scales | 2× and 4× by the AI; 8× = AI 4× + smooth 2×; 4K = long side about 3840 px. |
| Limits | Result up to about 16 MP; JPG / PNG / WebP in, PNG out; transparency becomes white. |
| Not the right tool for | Recovering faces or text that are unreadable in the source — the AI adds plausible detail, not the original. |
How it works
1. Choose an image
JPG, PNG or WebP. It stays on your device — the page reads it locally.
2. Pick 2×, 4×, 8× or 4K
The AI processes the image in small tiles and blends them, so even large photos upscale without seams.
3. Compare and download
Drag the slider to compare with a plain resize, then download the PNG.
FAQ
Is this image upscaler really free?
Yes. Upscaling runs in your browser on your own device, so there are no credits, no sign-up, no daily limit and no watermark.
Are my images uploaded?
No. The image never leaves your device. The page downloads the AI model once (about 5 MB) and processes the photo locally — you can check in your browser's network panel that no image is sent.
Which AI model does it use?
Real-ESRGAN general-x4v3, an open-source super-resolution model (BSD-3 license) that restores detail and removes blur and JPEG artifacts while enlarging 4×.
What do 2×, 4× and 8× mean?
2× and 4× are produced directly by the AI model. 8× is the AI's 4× result smoothly enlarged a further 2×, useful for printing small images.
What is the maximum size?
The result can be up to about 16 megapixels (for example 4096 × 4096). Pick a smaller scale for large photos; very large images can also exceed your browser's memory on phones.
Which formats are supported?
JPG, PNG and WebP in; PNG out, with the photo's orientation applied. Transparency is not preserved — transparent areas become white.
How long does it take?
Usually a few seconds to about a minute, depending on the image size and your device. Browsers with WebGPU are much faster.