It changes the wrapper.
A file format is the way the same underlying media is packaged and encoded. Converting changes compatibility and storage behaviour more than it changes the subject itself.
Video, GIF & Audio · Protect
Add a watermark to video.
Add a subtle text or logo mark, choose a social format and keep it away from the edges before you post.
1 Choose2 Adjust3 Download
Status
Choose a video to begin.
Output is WebM because modern browsers can encode it locally without uploading the clip to a server. Browser audio support varies, so check the downloaded file before posting.
Useful to know
Four things worth knowing.
Conversion is not enhancement.
Conversion is not enhancement. Re-encoding a poor source cannot restore missing detail, and some formats lose transparency, animation or metadata.
Check what the format dropped.
Play the exported file from beginning to end and check picture, sound, crop, timing and orientation.
Choose for what happens next.
Choose the format for what happens next: JPG for ordinary photos, PNG when transparency matters, WebP/AVIF for web delivery, and keep the source if you may edit again.