More free image tools
Same quality bar. Still free. Still no upload.
Your files never leave your device
Free to use, with no account, no usage limit and no watermark, because the work runs on your device rather than on our servers.
This is not a promise about how carefully we handle your upload. There is no upload. The file you choose is read into memory by your own browser, processed there, and handed back as a download — the tool has no server component and makes no network request with your data.
- Nothing is stored. We never receive the file, so there is no copy to retain, no retention period to disclose, and nothing to delete on request.
- Nothing is transmitted. No upload endpoint, no analytics payload carrying file contents, no third-party processor.
- You can verify it. Load this page, disconnect from the internet, and use the tool. It still works, because everything it needs is already on your machine.
- Nothing persists after you close the tab. Files are held in page memory only — not in local storage, not in a cache, not in a database.
A note on wording, because it matters: we do not describe these tools as “encrypted.” Encryption protects data that travels to somebody else's computer. Your file does not travel, so there is nothing to encrypt and nothing to intercept — which is a stronger guarantee than encryption, not a weaker one. The page itself is served over HTTPS like the rest of the site.
This makes the tools safe for material you are contractually barred from uploading to third-party services — client footage under NDA, unreleased campaign assets, anything covered by a confidentiality clause.
How it works
1. Drop a soft still
Product crops, screenshots, and logos work best from the largest source you have.
2. Pick 2x, 3x, or 4x
WebGPU runs Anime4K locally. Without WebGPU the tool falls back to canvas upsample.
3. Export PNG
Download and compare against the original. Nothing leaves your machine.
Questions
Is this a free AI image upscaler?
Yes for browsers with WebGPU: it runs Anime4K neural pipelines on your GPU (not a cloud Real-ESRGAN). Without WebGPU it falls back to canvas upsample plus sharpen and labels that clearly. The Anime4K shaders load once from this site with the page code, and your image is never uploaded.
Will 4x look sharp?
Anime4K can recover edge detail better than plain resize, especially on anime-like and graphic content. A tiny photo still will not look like a studio RAW. Start from the largest source you have, and prefer 2x when VRAM is tight.
What sizes are supported?
The limit is the result, not the file: the longest side of the output can be at most 8,192 px. That means a source up to 4,096 px on its longest side at 2x, 2,730 px at 3x and 2,048 px at 4x. Past that, the tool asks you for a smaller image or 2x. The tool does not check file size, and very large runs may fail on low-memory GPUs; try 2x instead.
Is there a free WebGPU image upscaler that runs in the browser?
Yes, this one. WebGPU is the browser's modern graphics interface. When your browser offers it, the page shows WebGPU ready and runs Anime4K, a family of small neural upscalers built for anime and line art, on your graphics card through the open-source anime4k-webgpu library. When it does not, the page shows Canvas fallback and uses a plain resize with a light sharpen. Either way the image stays on your device and you download a PNG.
Related tools
Stay in the same job cluster. Free tools stay on-device; paid tools are labelled as such.
These rearrange files. Versely makes new ones.
Everything on this page works on a file you already have, which is why it costs nothing. Generating something that did not exist (video from a prompt, a voice, a score) runs a model, and that costs credits.