Add Watermark to Video
Add a watermark to a video for free — stamp your name, website or logo onto MP4, MOV and WebM videos, choose the corner, size and opacity, or tile it across the whole video to deter reuse. See a live preview first. Runs privately in your browser.
100% private — everything is made on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Videos are made by your browser with its built-in encoders (WebCodecs) and the open-source Mediabunny library — your photos, videos and music are never uploaded. Works best in recent Chrome, Edge and Safari.
How to watermark a video
- Drop your video in the box.
- Choose text or a logo, and set size, colour, position and opacity.
- Check the preview.
- Click Add watermark, then download the MP4.
What you can use it for
- Protect client previews and drafts
- Brand your social videos with a logo or handle
- Mark stock footage and demo reels
- Add copyright notices to tutorials
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See all free image tools →Frequently asked questions
How do I put my logo on a video?
Choose Logo image, open a PNG (a transparent background looks best), then set the size, position and opacity.
Which position is best?
A corner is subtle and common for branding. For client previews, choose “Tiled across the video” so it can't simply be cropped out.
Does it keep the sound?
Yes, the audio is kept unchanged.
Is my video uploaded?
No. The video is read and encoded by your own browser using its built-in video encoders, so it never leaves your device — even large or private videos stay private.
Is there a file size limit?
There's no upload limit. The finished video is held in memory before download, so files up to a few GB work on most computers; very large files need more RAM.
Which browsers work?
Recent Chrome, Edge and Safari work best (they have hardware video encoders). Firefox 130+ works for most files.