Convert H.264 Files to MKV on Your Device
Repackage or encode H.264 as MKV in your browser for flexible media libraries and archives. Conversion stays on-device while a new MKV file is prepared.
Drop files here or browse (MAX 500 MB)
Max 500 MB per file
Preview (optional)
When your browser supports it, your video appears here. If preview does not load, you can still convert your file normally.
Preview is not available for this file
No worries — your video can still be converted. Set your file name and click Convert when you are ready.
Quick use cases
- Adapt technical delivery to a workflow built for multi-platform libraries
- Supply MKV when an editor, player, or delivery form will not accept H.264
- Create a MKV copy from H.264 for flexible media libraries and archives
Workflow
- Select the H.264 source file
- Confirm the planned MKV filename
- Run the conversion with MKV selected
- Download MKV and test it in the destination app
Processing notes
- The device processor performs decoding and encoding during the job during this H.264-to-MKV job.
- High-resolution H.264 footage increases conversion time and memory use.
- Check picture, sound, and timing in MKV before removing the source.
Compatibility notes
- MKV serves flexible media libraries and archives, whereas H.264 commonly serves encoders and systems requesting an AVC stream.
- For H.264-to-MKV delivery, plan for rejection by some TVs and upload forms.
- After leaving H.264, the receiving app must support the streams encoded inside MKV, not only its extension.
Troubleshooting
- H.264 to MKV taking too long? Reduce other processor activity and leave the page open until completion.
- MKV converted from H.264 not opening? Test a compatible player and inspect the output streams.
- Inspect the generated streams when an app recognizes MKV but refuses playback.
H.264 to MKV converter FAQ
When does H.264 to MKV conversion make sense?
It is useful when H.264 media created for technical delivery must enter a MKV system designed for multi-platform libraries.
Where is the H.264 source processed?
The browser prepares MKV from H.264 on this device instead of sending the source to a remote conversion server.
How can I approve MKV converted from H.264?
Test the MKV file in the receiving app and compare duration, picture, sound and timing with the H.264 source.