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Watermark Video Online: MP4, MOV, MKV and More

Add a text or logo watermark to MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP, MPG and M4V videos. No desktop software needed.

Watermark your videos Jump to the steps
  • No account needed to start
  • Up to 5,000 files per edit
  • Updated Oct 13, 2026

Watermark.ws watermarks videos as well as photos. Upload MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP, MPG or M4V files up to 2 GB, add a text or logo watermark, preview it, and download the result. The video is processed on our servers. Free and Premium process the first 30 seconds of each video; Ultimate processes full-length videos up to 4 hours.

How it works

  1. Step 1: Upload Your Video

    Drag your video onto the page or browse to select it. MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP, MPG and M4V work, up to 2 GB.

  2. Step 2: Add and Position Your Watermark

    Choose a text or logo watermark, set the font, color, size and opacity, then drag it into place on the frame. The preview shows the result.

  3. Step 3: Process and Download

    Apply the watermark and download the finished video. 3GP comes back as MP4 and WebM as MKV; the other formats keep their own.

What you can do

Preview Before You Process

See how your watermark sits on the video before it is processed. Adjust the placement, size and opacity first, so you do not have to process it twice.

Custom Watermark Positioning

Drag the watermark anywhere on the frame, resize it and set the opacity. Crop to 9:16, 16:9 or a social preset in the same edit.

Nothing to Install

Watermark videos from any computer or phone with a modern browser. The video is uploaded and processed on our servers, so there is no software or plugin to manage.

Questions people ask

What video formats does Watermark.ws support?
MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP, MPG and M4V, up to 2 GB per video. Videos are re-encoded with the watermark; 3GP comes back as MP4 and WebM as MKV.
How much of my video gets watermarked?
On Ultimate, the whole video, up to 4 hours long. The free Basic plan and Premium process the first 30 seconds of each video.
Where is the video processed?
On our servers. You upload the video, design the watermark in the editor and download the finished file, so nothing has to be installed on your computer or phone.
Can I add my logo to a video?
Yes. Upload your logo (a transparent PNG works best), position it on the frame, and adjust its size and opacity. It stays in place for the whole processed video.

Keep reading

Guide How to watermark a video The steps, from upload to download. Article Video watermark size and placement Where a watermark works on a video. Use case Watermark maker for edits An @handle on Reels and TikToks. Pricing Plans and pricing Ultimate processes full-length videos. File type Add a Watermark to Photos Online Add a text or logo watermark to JPG, PNG, HEIC, WebP and 25 RAW formats. Batch up to 5,000 photos on Premium, and crop, resize or frame them in the same edit. File type Watermark PDFs Online Stamp a PDF with Draft, Confidential, your name or your logo. It stays a PDF. Every page on Premium, the first page on the free plan. Nothing to install. File type Watermark Word Documents Online Add a text or logo watermark to Word (.docx) files online, no Microsoft Word needed. The file stays a .docx. Every page on Premium, the first page free. File type Add a Watermark to Animated GIFs Online Watermark animated GIFs online: your text or logo goes on every frame and the GIF stays animated. Up to 100 MB per GIF, nothing to install. Free to try.

Brand and Protect Your Videos

Add a watermark to a video file in a few minutes. Nothing to install, and no account needed to start.

Watermark your videos now