Video Watermark Adder

Add text or image watermarks to videos with position and opacity controls.

Tested tool guide Tested browser tools Checked August 16, 2026

What Video Watermark Adder does, with a checked example

This page takes a video you pick and draws a watermark into it: text you type or an image you upload, placed with position and opacity controls, and hands back a new video file with the mark in every frame. Everything runs in the browser, so the footage never leaves your machine. What surprises most people is that the watermark is permanent: it becomes part of the pixels of the new file, so no player can switch it off and nothing on this page can remove it later. Burning a mark in also means re-encoding, so processing takes time and the download can come out slightly softer than the source.

Worked example

A concrete input and expected output from the current implementation.

Input

Upload a 10-second, 1280 x 720 clip and a 400 x 200 px logo; set image watermark size to 15%, position bottom-right, opacity 40%.

Expected output

A downloadable video, still 10 seconds at 1280 x 720, with the logo drawn into every frame at 192 x 96 px: 15% of 1280 is 192 wide, and the logo's 2:1 ratio makes the height 96. It sits in the bottom-right corner at 40% opacity.

Size is set relative to the frame width, so the on-screen size follows from 1280 x 0.15, not from the logo's native 400 x 200 pixels; the aspect ratio is preserved, which is why the height is exactly 192 / 2.

How the result is produced

Every frame, first to last

The watermark is composited onto the footage while the new file is produced, so the text or image appears in every frame of the video, not only at certain times. Position, margin, size, and opacity fix how it is drawn, and the source file stays untouched. There is no timing control, so a mark that should show on only part of the clip means cutting the video first and watermarking the segment you want.

What opacity really does

Opacity blends the watermark with the footage behind it: 100% is fully opaque, mid values let the video show through, and 0% draws nothing, a useful way to export a file that looks unchanged. The blend is baked into each frame of the download, so what you set is what every frame contains. A near-zero setting is easy to mistake for a broken export, so check the output before trusting it.

Good uses

Marking a client preview DRAFT or CONFIDENTIAL so an unfinished cut cannot be passed off as final.
Putting a studio name or logo on a finished clip before it goes on a portfolio or social feed.
Adding a small credit mark so viewers can trace who shot or licensed the footage.

Limits and checks

The mark is permanent. There is no remove-watermark operation here, so keep the original file somewhere safe if you may ever need a clean copy.
A corner mark is labeling, not ownership. Cropping the frame, blurring the corner, or converting to a narrower aspect ratio can cut it off or hide it, so it deters casual copying at most.
The download is not a copy of the source. It is a re-encode, so it can be marginally softer than the input, and long or high-resolution videos take noticeable time to produce.

Common questions

Does the watermark cover the whole video?

Yes. The mark is drawn into every frame of the new file, from the first to the last; the controls set where it sits and how strong it is, not when it appears. For a mark that should show only during part of the clip, cut the video into pieces first and watermark only the ones you need.

Can I take the watermark off the finished file?

No, not on this page. The watermark is part of the pixels of the downloaded file, and there is no reverse operation. If you might want a clean version later, keep the original video you uploaded; re-exporting from the clean original is the only way to get one.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.