Enlarge an image 2× or 4× with Real-ESRGAN, an AI upscaler that sharpens detail instead of just stretching pixels. Runs in your browser; nothing is uploaded.
Upscaling uses an AI model that runs on your device (Real-ESRGAN general x4v3, BSD-3-Clause licence). The first run downloads about 8 MB once; after that it is saved in your browser.
Works in your browser. What you paste or upload is processed on your device.
Pick or drop a small or blurry image. The preview shows its current size in pixels.
Small images default to 4×, larger ones to 2×. The tool shows the result size and how many tiles it will process.
Press Upscale. The model downloads once (about 8 MB with the engine), then the tiles are processed with a progress bar.
Switch to Detail at 100% or click a spot on the image, then flip between After and Before to see the difference from a plain resize.
Save the result as PNG (lossless, keeps transparency) or JPG (smaller file).
An AI upscaler makes an image bigger by predicting detail that a normal resize can't create. Stretching a small picture in an ordinary editor just spreads the existing pixels out, which looks soft and blocky. This tool uses Real-ESRGAN (realesr-general-x4v3, BSD-3-Clause licence), a model trained on real photos to rebuild sharp edges and textures and to clean up JPEG noise while it enlarges.
The model runs in your browser with onnxruntime-web. Your image is cut into 128 × 128 pixel tiles with a small overlap so no seams show, each tile is enlarged 4×, and the tiles are stitched back together; for 2× the result is drawn at half that size. The progress bar counts the tiles and estimates the time left. The model is small (about 5 MB, plus about 3 MB for the engine) and is kept in your browser after the first download. If the model can't run on your device, the run fails with a clear message and isn't counted: it never falls back to a plain resize.
Honest limits: AI upscaling invents plausible detail, so it can't recover text, faces or numbers that aren't really there, and very blurred images stay soft. To keep the result within what phones can hold in memory, inputs above 1 megapixel (for 4×) or 1.5 megapixels (for 2×) are reduced first, so the tool is best for small images: old photos, thumbnails, screenshots, logos and web images.
Small images look poor when printed, used as a hero image or shown on a high-resolution screen. A 2× or 4× AI upscale gives you a usable larger file in under a minute for most images, without installing software, and because it runs on your device the picture stays private.
Something else? Ask the team
No. The upscaling model runs in your browser, so the image stays on your device. Our server only counts the run for the daily free use and credits.
You get one free run per tool per day. After that, each run costs 10 credits (10 US cents) from a free AI Rank Lab account. Switching views or the download format after a run is free.
Any image up to 50 MB opens, but to keep the result within phone memory limits, images above about 1 megapixel (for 4×) or 1.5 megapixels (for 2×) are reduced first. That gives results up to 16 megapixels at 4× and about 6 megapixels at 2×. For the most detail on a large photo, crop the part you need first.
It depends on the image size and your device. A 500 × 500 px image at 4× is 25 tiles and usually takes 15 to 40 seconds on a laptop; phones are slower. The progress bar shows the tile count and an estimate of the time left.
It helps with mild blur, JPEG blocks and low resolution, but it can't recover detail that isn't in the image. Faces, small text and number plates may come out smooth or slightly wrong, because the model fills in plausible detail rather than the real thing.
Yes, in current Safari, Chrome and Firefox. Phones are slower and have less memory, so use 2× for larger images. If the run stops because the device ran out of memory, it isn't counted and you can try a smaller image.
The tool tells you what went wrong and gives the run back (your free run is restored or your credits are refunded). It never quietly replaces the AI upscale with an ordinary resize.
Yes. If your PNG or WebP has transparency, the transparent areas are enlarged along with the image. Save as PNG to keep them; JPG has no transparency.
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