Enlarge any photo with this free image upscaler. Drop a photo in, pick 2x or 4x, and AI rebuilds detail as it enlarges, instead of just stretching the pixels into a blurry mess. There is nothing to install, no account to create and nothing to upload: the photo is processed on your own device, in your browser.
Most free upscalers cap the free download, add a watermark, or charge credits after a few runs. This tool has no such cap: you get the full resolution result every time, with no credits to spend and no sign-up. A 500 by 400 photo at 4x becomes 2000 by 1600, ready for print, a listing or a full screen design.
Key features
- Real AI upscaling, not a plain resize: the Real-ESRGAN general x4v3 model predicts detail that a stretched resize cannot, so edges and texture stay sharp.
- 2x and 4x: double each side for a quick lift, or quadruple each side for print and large screens. 2x is made by running the 4x model and resizing the result to half size, which keeps the AI detail.
- Full resolution output: the download keeps the full enlarged size, with no megapixel cap and no watermark.
- PNG or JPG download: keep a lossless PNG, or pick JPG for a smaller file to share.
- Private by design: your photo never leaves your device. The only download is the AI model itself, about 4.7 MB, fetched once and cached by your browser.
- Free, with no sign-up: no account, no credits and no daily limit.
How to use
- Drop your JPG, PNG or WebP photo onto the tool, or choose it from your device. Photos up to 25 MB are accepted.
- Pick 2x or 4x and click Upscale with AI. The first run also downloads the AI model, about 4.7 MB, once only.
- Check the enlarged photo next to the original, pick PNG or JPG, then download it.
How the AI image upscaling works
The tool runs Real-ESRGAN general x4v3, a small super-resolution model, directly in your browser through ONNX Runtime Web. Super-resolution means the model was trained on pairs of low and high resolution images, so it has learned what sharp edges, texture and fine lines should look like, and it rebuilds them as it enlarges. Large photos are processed in 256 pixel tiles with a small overlap, so seams do not show and the work stays within what a browser can handle.
Real-ESRGAN is released under the BSD 3-Clause licence, which is why this tool can use it freely. The trade off is honest: a small in-browser model will not match a large server model on every photo, but it runs privately, at no cost, and at full resolution, with no credits.
Honest limits worth knowing
Three limits are worth knowing before you start. First, the first run needs an internet connection to download the model, about 4.7 MB, and the runtime that runs it. After that first download the model is cached, so later runs start at once. Second, where detail is truly lost, the AI draws plausible texture: a soft photo will look sharper, but very small text and distant faces can change slightly, because the model has to guess what was there. Third, larger photos take longer, because they are processed tile by tile on your device, not on a server. Photos up to about 1000 px on the long side usually finish in under a minute.
If the AI model cannot load, the tool says so plainly and offers a plain high quality resize instead, clearly labelled as not AI, so you still get a larger image. For a different kind of clean up, try our Background Remover or Image Compressor. This tool is part of our watermark tools collection: free, no account, and nothing to install.