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