FLV to MKV
Convert FLV files to MKV in seconds, for free. Nothing to install.
Files are deleted from the server automatically after 1 h.
Why convert FLV to MKV?
- MKV files are usually several times smaller than FLV — faster to send and upload.
- MKV can hold several audio tracks and subtitles in one file — perfect for films and series.
You don't need to install any software to convert FLV to MKV. Upload your file, choose MKV and download the result a few seconds later. The conversion runs on our servers and your file is deleted automatically after 1 h.
FLV vs MKV: comparison
| Feature | FLVFlash Video | MKVMatroska Video |
|---|---|---|
| Developer | Macromedia / Adobe | Matroska |
| Released | 2002 | 2002 |
| Type | video | video |
| Compression | lossy | lossy |
| Opens with | VLC, MPV | VLC, MPV, PotPlayer |
Tip: converting to 720p or 480p makes the file much smaller.
How it works
- Choose or drop your FLV file.
- Pick MKV as the output format.
- Click “Convert” and download your file.
FLV to MKV: questions and answers
Will quality be lost when converting FLV to MKV?
MKV uses compression, but at the default settings the difference is hard to hear or see. You can choose a higher bitrate in Options.
How long does FLV to MKV conversion take?
It depends on the length: a short file takes a few seconds, a long video can take a few minutes. Progress is shown as a percentage.
What is the maximum FLV file size?
Up to 500 MB per file and up to 20 files at once — for free.
Can I convert FLV to MKV on my phone?
Yes. TezConvert works in any browser on Android and iPhone — no app needed.
How do I open a MKV file?
MKV files open in: VLC, MPV, PotPlayer.
Are my files safe?
Files are used only for the conversion, never shown to anyone, and deleted automatically after 1 h. The original is deleted right after conversion.
⇄ Need the opposite? Convert MKV to FLV →