How the video cleaner works
Your video plays through a canvas in your browser. On every frame, each box you drew is repaired by one of four methods:
- Fill from edges: each hidden pixel becomes a distance-weighted blend of the pixels just outside the box, the same idea as FFmpeg’s
delogofilter. It works best on small marks over simple backgrounds. - Blur and pixelate hide a mark without pretending it was never there.
- Solid paints a flat colour, which is useful for letterbox captions.
The frames are re-recorded with the original audio into a new MP4 (or WebM on browsers that can’t record MP4). Nothing is uploaded, so rendering takes about as long as the video plays. Keep the tab open until it finishes.
Limits worth knowing
- Frame-by-frame generative AI on video is not available here. It costs dollars per clip and takes minutes, so this tool uses fast deterministic fills that run on your device.
- Long 4K files are scaled to 1080p while rendering to keep phones responsive.
- Marks that move continuously need several boxes with time ranges. A mark that jumps between two positions needs one box per position.
Your own videos only
Platform watermarks credit the creator. Use this on videos you made, for example to repost your own clip to another platform, not to pass off someone else’s video as yours.
Questions
Can I remove a watermark from a video for free?
Yes. The video cleaner runs entirely in your browser, has no sign-up and adds no watermark of its own.
Is my video uploaded?
No. It is decoded, repaired and re-encoded by your browser. That is also why rendering runs in real time.
What format do I get?
MP4 (H.264) in Chrome, Edge and Safari, and WebM in browsers that can only record WebM, like Firefox. Both play in VLC, and most platforms accept either.
Can it remove a moving watermark?
Yes. Auto-detect samples up to 12 frames, finds the watermark in each with an AI vision model, and creates a box with start and end times for every position. Scrub through to check, then render.
How do I remove a watermark from a video without blur?
Use Fill from edges with a tight box. It blends real surrounding pixels instead of blurring. On busy moving scenes a soft patch can still show, and there blur is the less noticeable option.
Can I remove the watermark on iPhone or Android?
Yes, in Safari 17+ or Chrome. Rendering runs at normal playback speed, so keep the screen on and the tab open.
Why is there a soft patch where the logo was?
Fill from edges blends the surrounding pixels, so a large box over a detailed scene looks smooth. Make the box as small as the mark allows, or use blur for a less noticeable result.