Convert

Convert WebM to MKV

VP9 video with Opus audio for the web. Matroska video container for high-quality rips.

Free to use — no account or signup required.
Your file is deleted the moment the conversion finishes.
Handles large files — up to 1 GB per conversion.
Prefer code? The same conversion is one API call away.

io bay · WebM → MKV

Input · WebMDrop a WebM file here, or click to browse.webm

Idle

Questions

faq

How do I convert WebM to MKV?

Upload or paste your WebM file, press Convert, and download the MKV result. It's free and no account is required.

Is my file kept after conversion?

No. Your uploaded file is deleted the moment the conversion finishes, and the converted output expires shortly after.

Can I run this conversion over an API?

Yes. The same WebM to MKV conversion is available as a REST API.