How AI upscaling in a browser works
The Anime4K network is a small convolutional model — a few hundred kilobytes of weights. WebSR compiles it into WebGPU compute shaders, so every frame is convolved directly on your graphics card. Your video is decoded, each frame is passed through the network, and the result is re-encoded, all inside this page.
That is why there is no upload step, no queue and no length limit: the work happens on hardware you already own, so the site's cost per video is zero and your footage never leaves the machine.
Choosing model and content type
- Small — real-time on integrated graphics; good for 480p→960p.
- Medium — the sweet spot on most discrete GPUs.
- Large — sharpest lines, wants a dedicated GPU.
The content variants are separately trained: pick animation for anime and cartoons (where it shines), real life for camera footage, 3D for game capture and CGI.
What it can and cannot do
Anime4K excels at restoring crisp lines and flat colour regions — exactly what animation is made of. On noisy camera footage the gain is more modest, and it will not invent detail that was never recorded. It is a fast line-and-edge reconstructor, not a generative model that hallucinates faces.
Frequently asked questions
Is my video uploaded anywhere?
No. Decoding, the neural network itself and re-encoding all run inside your browser on your GPU. You can watch the network tab: no video data leaves your device.
Why does it need WebGPU?
The upscaling network runs as GPU compute shaders. WebGPU is the browser API that exposes that capability — available in Chrome and Edge 113+ and Safari 26+. Without it there is no way to run the model at a usable speed.
How long does a video take?
Roughly real time on a decent GPU with the small or medium model — a 2-minute clip takes about 2 minutes. The large model and 4K output take proportionally longer.
Why is the output WebM instead of MP4?
Browsers reliably expose VP8/VP9 for encoding; H.264 export is not available everywhere. WebM plays in every modern browser and in VLC, and our video converter can repackage it if you need MP4.
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