Add Watermark to Video

Overlay your own logo image or a text mark on a video, with a position, opacity and size you choose. Runs in your browser and adds no forced branding.

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Drop your files here (.mp4, .mov, .m4v, .webm, .mkv, .avi, .png, .jpg, .jpeg, .webp)

🔒 Private by design: your files are processed locally in your browser and never uploaded to any server.

Written and maintained by Last updated

Two kinds of watermark, one mechanism

You can watermark a video with your own logo or with a stock text mark, and this page supports both by turning them into the same thing.

Both are handled as an image overlaid on the picture. A logo you upload is already an image. A text watermark is drawn to a transparent image in the browser before anything else happens, and from that point on the two paths are identical.

That design is not an aesthetic choice, it comes from a real constraint. The video engine running in your browser has no font files bundled with it, so the filter that would normally draw text has nothing to draw with and would silently produce nothing. Rendering the text in the browser, where fonts obviously do exist, and handing the result over as an image is what makes a text watermark work at all here.

Applying a watermark

  1. Select your video, and optionally a logo image in the same selection.
  2. If you did not upload a logo, choose one of the four Text watermark options.
  3. Choose a Position from the four corners or the centre.
  4. Set the Opacity as a percentage and the Watermark size as a percentage of video width.
  5. Run it and download the result, an MP4 named after your video.

Everything is proportional

Both the size and the margin are expressed relative to the video rather than in pixels, for the same reason as on the image version of this tool.

A watermark fixed at 200 pixels wide is a third of the frame on a small clip and a barely visible sliver on a 4K one. Setting it as a percentage of the video’s width means a value of 15 gives the same visual weight regardless of the source resolution, and the height follows from the logo’s own aspect ratio so nothing is ever stretched.

The gap from the edge is 3 percent of the frame, which keeps a corner mark clear of the edge on any resolution and clear of the safe area cropping that some platforms apply.

Why this one cannot avoid a re-encode

Several video tools on this site are near instant because they copy the compressed data through and only rewrite the container. Trimming and splitting work that way, and so does changing the volume, because none of them alters the picture.

A watermark does alter the picture, and there is no shortcut. Every frame has to be decoded, composited with the overlay, and encoded again. That is genuine work and it takes proportionate time on a long clip.

The encode uses a quality target rather than a fixed bitrate, which means the result tracks the source’s own complexity instead of being forced to a size, so the visible quality stays close to the original. It is still one generation of loss, which is unavoidable, and it is why watermarking should be the last step in a workflow rather than the first.

What happens to the sound

Nothing, wherever possible. A watermark has no business touching audio, so an existing AAC track is copied straight across with no re-encode at all.

The exception is a source whose audio codec cannot live in the MP4 container the result uses, which covers the Opus in a WebM and the uncompressed audio in some MOV files. Those are converted to AAC at 128 kbps, which is the minimum change needed to produce a valid file. A silent video comes back silent.

For photos rather than video, Add Watermark to Photos offers the same positions plus a tiled mode, which is worth using when the mark is a deterrent rather than a credit. For documents, Watermark PDF stamps every page.

Because watermarking re-encodes, run Crop Video before it rather than after, so the mark is placed against the final framing. Since the result is always an MP4, Compress Video can take it from there if the file is larger than you want. The rest are on the video hub.

Frequently asked questions

How do I use my own logo?

Upload it alongside the video. The picker accepts a video plus one optional image in the same selection, and when an image is present it becomes the watermark and the text option is ignored. Without an image the chosen text is used instead. Uploading more than one image is refused, since there is no sensible way to interpret two watermarks.

How is the text watermark rendered if there is no font in the engine?

The text is drawn to a transparent image in the browser first, and that image is then overlaid exactly like an uploaded logo would be. This matters because the video engine used here has no font files bundled, so the usual text drawing filter cannot render anything at all. Rendering the text outside the engine and treating it as a logo is what makes text watermarks work rather than silently producing nothing.

Does the watermark scale with the video?

Yes. The size is a percentage of the video's own width rather than a pixel figure, so a logo set to 15 percent occupies the same share of the frame on a 720p clip and a 4K one. The height follows automatically from the image's aspect ratio, so a logo is never stretched. The margin from the edge is also proportional, at 3 percent of the frame.

Does the video have to be re-encoded?

Yes, and there is no way around it. Drawing something onto the picture means decoding every frame, compositing, and encoding again, unlike an audio only change that can copy the video through untouched. The encode uses a quality based setting rather than a fixed bitrate, so the result stays close to the source's quality, and it takes real time on a long clip.

What about the audio track?

A watermark never touches it, so an existing AAC track is copied across bit for bit with no re-encode. Anything else, such as the Opus in a WebM or the uncompressed audio in some MOV files, is converted to AAC at 128 kbps because those codecs do not belong in the MP4 container the result uses. A video with no audio comes back with none.

Why is the output always an MP4?

Because the video is being re-encoded regardless, so a container has to be chosen, and MP4 with H.264 is the one that plays everywhere. The index is also moved to the front so the file starts playing before it has fully downloaded. The result is named after your video with a watermarked suffix.

Is anything uploaded, and does it add its own branding?

Nothing is uploaded and nothing is added beyond the watermark you configured. The whole job runs in your browser tab, which is why there is no queue and no account, and why the tool has no reason to stamp its own name on your video the way free online converters routinely do.

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