MP4 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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Convert MP4 to MKV online
Use this MP4 to MKV converter to turn MP4 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 MP4 comes with a tradeoff: lossy compression.
When should you convert MP4 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 MP4's common limitation: lossy compression
- To open your files in apps that prefer MKV
About MP4 and MKV files
MP4 video
Strengths
- plays almost everywhere
- good quality-to-size
- widely supported
Limitations
- lossy compression
- less flexible than MKV
MKV video
Strengths
- holds many tracks
- flexible container
- high quality
Limitations
- not supported on all devices
MP4 vs MKV
| Format | MP4 | MKV |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | — | — |
| Best for | streaming and sharing and playback on any device | high-quality video and multiple audio and subtitle tracks |
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Frequently asked questions
- Is this MP4 to MKV converter free?
- Yes. You can convert MP4 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 MP4 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 MP4 files at once?
- Yes. Drop several files to convert them in a batch and download the results as a single ZIP.