Blur Faces in Video
Track every face through your video and blur it — keeps the sound, free, and your video never leaves your device.
Processed on your device · no uploadDrop a video here or choose a file
MP4, MOV, WebM · or paste with Ctrl+V
Runs on your device. The first time, the face detector (about 10 MB) is downloaded once and then kept in your browser.
What to do next
How to use Blur Faces in Video
Add your video
Drop an MP4, MOV or WebM clip. Faces are found and followed automatically.
Check the faces
Move the slider to look at any moment, switch off faces that should stay visible, or drag a box for one that was missed.
Pick a style
Blur, pixelate, black box or emoji sticker, with strength and padding.
Save
Press the button, wait for the progress bar and download the MP4. The picture is rendered with the blur burned in.
Frequently asked questions
Is my video uploaded?
No. Detection, blurring and encoding all run in your browser. About 10 MB of detector files are downloaded once the first time and then cached.
Does the result keep the sound?
Yes, the original audio is added back to the new MP4. If your video has no audio track, or its audio format cannot be read by the browser, the result is silent and the page tells you.
Which AI model does this use?
YuNet (MIT) from the OpenCV Zoo, run with onnxruntime-web (MIT). Faces are looked for about six times a second and followed in between, with some extra margin so quick moves stay covered.
How long a video can I use?
Up to 2 minutes and 500 MB on a computer, and the first 30 seconds on a phone. Output is capped at 1080p on a computer and 720p on a phone. Every frame is redrawn, so processing takes from about the length of the clip up to several times that, depending on your computer and the resolution.
What can go wrong?
Faces that turn away, are very small, covered or in strong shadow can be missed for a moment. Scrub through the preview and add a box where needed — and always watch the result before you post it. Variable-frame-rate phone videos are saved at a steady frame rate.
Which browsers work?
Recent Chrome, Edge and Safari on a computer. The tool needs WebCodecs video encoding, which Firefox and some older browsers do not offer yet.