How to use
- Drop in or select a video file (MP4 and other common formats).
- Choose a transparent PNG logo with the logo picker.
- Pick the corner where the watermark should appear.
- Click Apply Watermark, then download your watermarked MP4.
Frequently asked questions
Is my video uploaded to a server?
No. Everything runs locally in your browser with ffmpeg.wasm. Your video and PNG logo never leave your device — nothing is uploaded, which keeps your footage completely private.
What video formats can I watermark?
You can drop in MP4 and other common video formats. Whatever you start with, the watermarked result is always exported as an MP4.
What logo format is supported?
Upload a PNG, ideally with a transparent background so only your logo — not a solid box — shows over the video. Other image formats and text watermarks are not supported.
Where can I place the watermark?
You can position the logo in any of the four corners: top left, top right, bottom left, or bottom right, with a small 10px margin from the edge.
Will the audio or video quality be affected?
The original audio is kept and re-encoded to AAC for MP4 compatibility, and the logo is overlaid on top of the frames without cropping or resizing the video.
Why is the first run slow?
The first time you use a video tool, the ~30 MB ffmpeg engine downloads to your browser. It is then cached, so later runs start much faster. Larger videos also take longer to process.
About this tool
Add a PNG watermark or logo to any video free in your browser. Pick a corner, keep the audio, export MP4. Runs locally with ffmpeg.wasm — nothing is ever uploaded.