Watermark Video Online
Processing entirely on your device — large files may take a moment.
Add one video and one logo image to the queue, pick a corner, and the logo is scaled to 25% of the video width with its transparency respected — PNG alpha channels read perfectly. The composite is re-encoded once at high quality.
Position tips: bottom-right reads as classic branding, top-left keeps the corner free for platform UI, center is a hard-to-ignore ownership stamp.
How to watermark video
- 1
Select your files
Drag & drop your MP4 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to MP4". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MP4 file individually, or grab everything at once as a ZIP archive.
About the MP4 format
MP4 (MPEG-4 Part 14) is the universal delivery container of digital video. It wraps H.264, HEVC or AV1 video with AAC audio, and its structure — separate metadata (moov) and media atoms — is what makes streaming, seeking and fast-start playback possible. Phones, cameras, TVs, browsers and every social platform assume MP4 first.
Quality is entirely a function of the codec and bitrate chosen at encode time, so an MP4 can be a 10 Mbps HEVC master or a postage stamp. That flexibility plus total playback coverage is why nothing has displaced it in twenty years — conversion between formats almost always ends in MP4.
+Strengths
- ✓Plays on every device and platform in existence
- ✓Streaming-ready structure (fast start, seeking)
- ✓Choice of modern codecs: H.264, HEVC, AV1
!Limitations
- −Quality depends entirely on encode settings
- −HEVC variants hit licensing gaps on some platforms
Frequently asked questions
Which image formats work as the logo?
PNG (with transparency), JPG and WebP. PNG with an alpha channel is the best choice — the video shows through everywhere the logo is transparent.
Can I use text instead of an image?
Image logos only for now — browser-side text rendering needs an embedded font. Make a transparent PNG with your text in any editor and drop it here.
Can I watermark several videos with the same logo?
One video per run in this version — the queue holds one video and one logo. For batches, repeat with the same logo file.