Convert MP4 to WebM for the web
Re-encode MP4 videos as WebM (VP9 or VP8 with Opus audio) for websites and open-format workflows. The conversion runs locally in your browser.
Your files stay on your device: they are processed in this browser tab’s memory and never uploaded.
Why WebM
WebM is an open, royalty-free format that every major browser plays natively — a good choice for website backgrounds and HTML5 video.
Quality settings
Choose a quality level; higher keeps more detail, lower makes lighter files for autoplay backgrounds.
FAQ
Which codec is used?
VP9 when your browser can encode it, otherwise VP8; audio is Opus.
Is it slower than MP4?
VP9 encoding can be slower on devices without VP9 hardware encoders.
What can you do with a video converter?
Creators convert iPhone MOV clips and screen-recorded WebM files to MP4 before posting to Instagram, TikTok or YouTube; podcasters and students pull MP3 audio from interviews and lectures; developers and support teams turn short screen captures into GIFs for docs and chats; editors rewrap MKV recordings into MP4 so their NLE accepts them; and motion designers convert Animdock WebM exports into whatever format a client or platform needs.