About Image Upscale

A free image enlarging tool built on one idea: your pictures should never have to leave your computer.

Why this site exists

Most online upscalers work the same way. You upload your photograph to a company's server, it is processed there, and you download the result. Convenient, but it means handing your image to someone else's computer and trusting a promise about what happens next.

For a holiday snapshot that may not matter. For a scanned document, a photograph of your family, an unreleased product shot, or client work under a confidentiality agreement, it matters a great deal.

Modern browsers can now run neural networks directly. That makes a different design possible: instead of sending the picture to the AI, send the AI to the picture. This site does exactly that. The model downloads to your browser once, and every image after that is processed on your own hardware.

How it is built

Upscaling uses Real-ESRGAN (general x4v3), an open-source super-resolution model, running through ONNX Runtime Web. Large images are processed in overlapping tiles so memory use stays reasonable, and the tiles are stitched back together seamlessly.

There is no server-side processing of any kind. The site is a set of static files. That is also why it stays free however many people use it: there are no per-image computing costs to recover.

What we do not do

• We do not upload, collect, store or look at your images.
• We do not require registration.
• We do not add watermarks or limit how many images you may process.
• We do not sell personal information.

How the site is funded

Running costs are covered by advertising, which is why you will see clearly marked ad spaces. Advertisements are kept away from the tool's own controls so they never get in the way and never cause an accidental click.

Get in touch

Feedback, bug reports and suggestions are welcome through the contact page.