Anime4K - Free AI Video & Image Upscaler
Upscale anime video and images right in your browser. It runs the open-source Anime4K algorithm on your own GPU — no download, no signup, no upload. Drop a file and watch lines get crisp.
What Anime4K Does for Your Anime
Anime4K is famous as an mpv shader that sharpens anime while you watch. This site takes the same idea online: drop an episode or a screenshot, and it gets rebuilt at higher resolution in your browser — nothing to install.
- Built for Line Art, Not PhotosAnime is flat colors and clean outlines. It restores edges and removes the blur that generic upscalers smear across them — so 720p rips look like they were drawn at 1440p.
- Video and Images in One PlaceTwo tabs, one tool. Video is doubled in resolution (720p → 1440p, 1080p → 4K), and stills go up to 4x — screenshots, wallpapers, fan art.
- Your Files Never Leave Your DeviceEverything runs on your own GPU through WebGPU. No upload, no server queue, no account. Close the tab and nothing of yours is anywhere else.
- No mpv, No Shaders, No SetupSkip the shader packs, config files and GPU driver hunts. It works in Chrome, Edge, Safari and Firefox on Windows, Mac and Linux — open the page and go.
Why Use Anime4K Online Instead of Installing It
The classic Anime4K needs a video player, shader files and a GPU that plays nice with them. The browser version gives you the result without any of that.
How to Upscale Anime with Anime4K — 3 Steps
No terminal, no config. Three clicks from a blurry file to a sharp one:
Drop Your Anime
Pick the Video tab for MP4, MOV, MKV, WebM, AVI or TS episodes, or the Image tab for JPG and PNG stills. Only files your browser can play will load.
Choose a Network Size
Small, Medium or Large. The first frame is previewed so you can compare before committing to the whole clip.
Download the Sharp Version
Every frame is processed on your GPU, then you get the file. Audio stays untouched, no watermark, no login.
What Powers Anime4K in the Browser
The same anime-focused upscaling people run in mpv, rebuilt to run on WebGPU. Here's what's under the hood.
Anime4K Algorithm, Real-Time Class
The algorithm was designed to keep up with playback on consumer GPUs. In the browser that speed goes into finishing your file quickly instead of rendering live.
2x Video, up to 4x Images
Video doubles resolution — 1080p becomes true 4K. The Image tab adds a 4x network for stills on capable desktop GPUs, and falls back to 2x safely elsewhere.
Line-Aware Reconstruction
It sharpens outlines and denoises flat regions separately, so edges get crisp without the halo and grain that photo upscalers add to cel shading.
Hardware Video Encoding
Frames go straight from the upscaling pass into your browser's hardware encoder. No second compression step, no extra quality loss.
Audio Passes Through Untouched
Only the picture is processed. Dialogue, OP/ED music and effects are copied over without re-encoding.
Streams Frame by Frame
Processing runs through the video one frame at a time and can write straight to disk, so a full 24-minute episode doesn't blow up your tab.
Anime4K by the Numbers
Anime upscaling without the desktop overhead.
2x / 4x Video / Image Upscale
Video / Image Upscale
0 Software to Install
Software to Install
100% Processed on Your Device
Processed on Your Device
Anime4K FAQ
What Anime4K does, how it works in the browser, and what it costs (nothing).
Upscale Your Anime with Anime4K Now
No download, no signup, no cost. Drop a clip or a screenshot and let Anime4K sharpen it on your GPU.