Convert WebM to MP4, free
WebM is the web's favorite format and Apple's least favorite — downloaded clips, screen captures, and Discord media arrive as .webm and then refuse to open on iPhones, in QuickTime, or in older editors. The fix takes seconds: drop the file with MP4 pre-selected and download a universally playable copy at original quality. VP9 and AV1 sources transcode cleanly with hardware acceleration; plain VP8/WebM sources often remux near-instantly.
How to convert WebM to MP4
- 1Drop your WebM on the converter above. MP4 output is already selected.
- 2Keep Original quality unless the file is also too big — then step to Balanced.
- 3Hit Convert and download. The MP4 plays on iPhone, QuickTime, PowerPoint, and everywhere else.
WebM conversion notes
Transparency gets flattened
MP4 can't hold an alpha channel, so transparent WebMs are composited (usually onto black). Fine for clips, fatal for overlays — plan accordingly.
Often near-instant
Compatible VP8/VP9 streams frequently copy straight through without re-encoding, so small clips finish in seconds.
Going the other way?
MP4 sources destined for the modern web are usually better kept as MP4 — convert to WebM only when a site demands it.
Frequently asked questions
Why convert WebM to MP4?
Playback. iPhones, QuickTime, PowerPoint, and many TVs and editors accept MP4 but reject WebM.
Do I lose quality?
Not on Original quality. VP9/AV1 sources re-encode transparently at high bitrate; compatible streams may copy through untouched.
What happens to transparent backgrounds?
They're flattened since MP4 has no alpha channel — usually onto black. Keep the WebM if you need transparency.
Are my files uploaded?
No — conversion runs 100% in your browser.