WEBM to MKV Converter
Need to convert this file type? Drop it below — or drop any other file and we'll auto-switch. Outputs are auto-deleted after 2 hours; share links expire after 4.
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Drop multiple images to combine them into one PDF, Word document, or PowerPoint presentation — or convert each image separately.
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Drag your WEBM file or click to browse.
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Convert WEBM to MKV online
Use this WEBM to MKV converter to turn WEBM files into MKV right in your browser — ideal for high-quality video, multiple audio and subtitle tracks and archiving. MKV is valued for being holds many tracks, while WEBM comes with a tradeoff: limited support in some apps.
When should you convert WEBM to MKV?
- To reduce file size and make uploading and sharing easier
- To get MKV's built-in advantage: holds many tracks
- To move past WEBM's common limitation: limited support in some apps
- To open your files in apps that prefer MKV
About WEBM and MKV files
WebM video
Strengths
- small for the web
- open and royalty-free
Limitations
- limited support in some apps
- less common offline
MKV video
Strengths
- holds many tracks
- flexible container
- high quality
Limitations
- not supported on all devices
WEBM vs MKV
| Format | WEBM | MKV |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | — | — |
| Best for | web video and open-source playback | high-quality video and multiple audio and subtitle tracks |
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Frequently asked questions
- Is this WEBM to MKV converter free?
- Yes. You can convert WEBM to MKV online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. The conversion runs entirely in your browser — no installs and no account required.
- Will converting WEBM to MKV reduce quality?
- MKV uses lossy compression, so the file can get smaller while some visual quality may change.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.
- Can I convert multiple WEBM files at once?
- Yes. Drop several files to convert them in a batch and download the results as a single ZIP.