Online Tool Store
Video Watermarker
Add a text watermark to any video in a chosen corner, rendered live and exported as a downloadable video. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Nothing is uploaded. Output format depends on your browser's recording support (usually WebM).
No video yet - choose one to add a text watermark.
How the video watermarker works
- Choose a video and enter your watermark text and position.
- Press render - the video plays once while each frame is drawn to a canvas with the watermark overlaid.
- The canvas stream is recorded live and produced as a downloadable watermarked video.
The method
Each video frame is drawn onto a canvas, with the watermark text and a semi-transparent background box drawn on top in the chosen corner. The canvas's live video stream (via captureStream()) is recorded with MediaRecorder as the video plays through, producing a new encoded video with the watermark baked in.
FAQ
Why does the output download as WebM instead of MP4?
The watermark is added by re-recording the canvas with the browser's built-in MediaRecorder API, which most browsers only support encoding to WebM without extra libraries.
How long does rendering take?
Rendering happens in real time - a 30-second clip takes about 30 seconds to process, since each frame is drawn and encoded as the video plays through once.
Can I change the watermark position and text after rendering?
Change them before pressing "Render watermarked video" - the position and text are baked into the final video frame by frame during rendering.
Is my video uploaded anywhere?
No. The video is decoded, watermarked, and re-encoded entirely in your browser tab - nothing is sent to a server.
How we compare
| Feature | Online Tool Store | Video editing software | Other online watermark tools |
|---|---|---|---|
| No file upload - runs in your browser | ✓ | ✓ | ✗ |
| No install required | ✓ | ✗ | ✓ |
| Free, no watermark on the watermarker itself | ✓ | ✓ | Often paid |
For a quick text watermark without installing editing software, Video Watermarker handles it in your browser tab.