Convert MP4 to WebM on Mac
Turn MP4 Video files into WebM 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 MP4 to WebM on a Mac
Open Offline Converter for Mac and drag your MP4 file (or many) into the window.
Choose WebM as the output format and adjust quality or size if you need to.
Click Convert — the WebM file is saved straight to your Mac. Done, offline.
Why convert MP4 to WebM locally
Your files stay private
Your MP4 files never get uploaded. Everything is processed on-device, so sensitive photos and documents stay yours.
No watermark, no limits
Convert as many MP4 files to WebM 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 MP4 and WebM
MP4 Video. MP4 Video is a common video format. WebM Video. WebM Video is a widely supported video format.
MP4 to WebM — FAQ
Is converting MP4 to WebM free?
You can convert MP4 Video to WebM Video on your Mac with the free trial. There's no watermark and nothing is uploaded.
Do my MP4 files get uploaded?
No. The conversion happens entirely on your Mac. Your MP4 files never leave your device — it even works offline.
Can I convert many MP4 files at once?
Yes. Drop a whole folder of MP4 files and convert them all to WebM in a single batch.