Offline ConverterConvert WebM to MP4 on Mac
Turn WebM Video files into MP4 Video right on your Mac — fully offline. No uploads, no watermark, no size limit. Drag in one file or a whole folder and convert in seconds, accelerated for Apple Silicon.
How to convert WebM to MP4 on a Mac
Open Offline Converter for Mac and drag your WebM file (or many) into the window.
Choose MP4 as the output format and adjust quality or size if you need to.
Click Convert — the MP4 file is saved straight to your Mac. Done, offline.
Why convert WebM to MP4 locally
Your files stay private
Your WebM files never get uploaded. Everything is processed on-device, so sensitive photos and documents stay yours.
No watermark, no limits
Convert as many WebM files to MP4 as you want — no watermark, no size cap, no daily quota.
Fast on Apple Silicon
Conversion is hardware-accelerated and runs at the speed of your SSD, even for large batches.
About WebM and MP4
WebM Video. WebM Video is a common video format. MP4 Video. MP4 Video is a widely supported video format.
WebM to MP4 — FAQ
Is converting WebM to MP4 free?
The 3-day trial converts WebM Video to MP4 Video with no watermark, no size limit and nothing uploaded. After that the app is $29.99 once — not a subscription.
Do my WebM files get uploaded?
No. The conversion happens entirely on your Mac. Your WebM files never leave your device — it even works offline.
Can I convert many WebM files at once?
Yes. Drop a whole folder of WebM files and convert them all to MP4 in a single batch.
Convert WebM to MP4 on Mac
Free 3-day trial, then $29.99 once · macOS 11+ · Nothing leaves your device