Make small or blurry images bigger and sharper with AI that rebuilds the detail. 2× or 4×, free and private.
Upscaling by Real-ESRGAN (BSD 3-Clause License) running with ONNX Runtime Web.
It uses Real-ESRGAN, an AI model trained to rebuild fine detail, so edges stay sharp and textures look natural instead of blurry or blocky like a normal resize. It runs in your browser: the 5 MB model is downloaded once and your image is never uploaded.
2× is best for most uses: printing a small photo larger, a sharper profile picture, or an old image for a website. 4× gives the biggest result for small images such as icons, thumbnails or screenshots.
The image is processed in small squares on your device's processor. A 500×500 image takes around 20 to 40 seconds on a recent laptop and longer on phones. The progress bar shows how far along it is.
The result can be up to about 16 megapixels, which is the largest image all browsers can handle. Bigger images are reduced to fit before upscaling, and you'll see a note when that happens.