WebM to MP4

How to use

Converts WebM screen recordings and downloads into MP4 that plays on any device. Drop the WebM, choose a quality, and download.

File ConvertersLocal only

Step 1 of 4 · Upload

1Upload
2Options
3Convert
4Download

When to use this

Making a browser screen recording playable on an iPhone
Embedding a WebM recording in a PowerPoint or Keynote deck
Uploading a recording to a site that only accepts MP4
Sending a meeting recording to someone on an older computer

Free and private. Everything runs on your own device, with no account and no uploads.

WebM is what browsers produce when they record: screen recorders, Loom-style tools, Google Meet downloads and many web apps save WebM with VP8 or VP9 video. iPhones, older Windows players, PowerPoint and many upload forms want MP4 instead. Because those codecs cannot go inside a standard MP4, the video is re-encoded to H.264 with your device's hardware encoder, which is fast and keeps the picture visually the same at High quality.

WebM usually carries VP8 or VP9 video, which standard MP4 players do not expect, so it is converted to H.264. MOV usually already holds H.264, so it can simply be rewrapped.

Any re-encode loses a little, but at High quality it is not visible. Screen recordings in particular convert cleanly.

Browsers ship VP8/VP9 decoders; PowerPoint, QuickTime and many TVs do not. MP4 with H.264 is the format they all share.

Opus audio is kept where the MP4 player can handle it, or converted to AAC when the browser can encode AAC.

How it works

1
Add the WebM file
Drop a screen recording or downloaded WebM. MKV is accepted too.
2
Choose quality
High keeps it visually identical; Medium makes it smaller.
3
Optionally resize
720p is ideal for screen recordings you will share in chat.
4
Convert and download
You get an H.264 MP4 that opens on any phone or computer.

WebM to MP4

About WebM to MP4 & FAQs