Format Converter

Convert WebM to MP4 Instantly

The fastest way to make your WebM files compatible with iPhone and Video Editors. No server uploads, no file size limits.

100%
Private
0s
Upload Time
Free
No Watermark
demo_project.mp4
Export
Demo Video
00:02:14 / 00:15:00
Split

Fix Compatibility Issues

WebM files often fail to play on iPhones, QuickTime, or Premiere Pro. Convert them to MP4 to ensure they work everywhere.

No Upload Waiting

WebM recordings (like from OBS) can be huge. We process them locally, so you don't waste hours uploading 2GB files to a server.

100% Private

Your gameplay footage or personal recordings never leave your device. The conversion happens entirely within your browser.

Format Freedom

Why
Convert WebM to MP4?

Downloaded a video or recorded gameplay with OBS, but it's a .webm file that won't open on your iPhone or editing software? FastVideoCutter solves this by converting WebM to the universal MP4 format directly in your browser. It's faster and safer than traditional online converters because we don't upload your files.

OBS & Gaming

Streamers and gamers often record in WebM/MKV. Our tool helps you quickly convert these large recordings to MP4 so you can share them on TikTok or YouTube Shorts.

Save Bandwidth

Don't waste data uploading files to the cloud just to convert them. Our offline-first technology saves your bandwidth and keeps your data on your machine.

How to convert WebM to MP4 for free?

01

Launch Tool

Click 'Start Editing' to open the converter. It works directly in your browser on Windows, Mac, or Linux.

02

Drop WebM File

Drag your .webm file (even huge OBS recordings) into the editor. No uploading means it loads instantly.

03

Trim (Optional)

If you only need a highlight, use the timeline to trim or cut your video before converting.

04

Export MP4

Click Export. The tool encodes the WebM stream into a standard MP4 file compatible with all devices.

Start Converting Now