Convert FLV to MKV
Free, fast and secure — convert FLV to MKV right in your browser.
Convert FLV to MKV for wider compatibility
Converting FLV to MKV gives you a more widely supported file that opens cleanly across more devices, apps and platforms — handy when FLV will not play nicely everywhere.
How to convert FLV to MKV
- 1 Drop your FLV file into the converter above.
- 2 It is converted to MKV automatically — no settings to fiddle with.
- 3 Download your new MKV file instantly.
FLV vs MKV
| Feature | FLV | MKV |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | No | No |
| Animation | Yes | Yes |
| MIME type | video/x-flv | video/x-matroska |
| Best for | Rescuing old Flash video by converting it to MP4 or WebM. | Archiving high-quality video with multiple tracks — converted to MP4 for everyday playback. |
About the formats
Flash video
FLV is the old Flash video container. Once dominant for web streaming, it is now obsolete and almost always needs converting to a modern format like MP4.
Strengths
- Small files for its era
- Plays in legacy Flash players
- Common in old web archives
Limitations
- Obsolete — Flash is discontinued
- No support on modern devices
- Lower quality than modern codecs
Best for: Rescuing old Flash video by converting it to MP4 or WebM.
Matroska video
MKV (Matroska) is a flexible open container that can bundle many video, audio and subtitle tracks in one file. It is popular for high-quality archives and media libraries.
Strengths
- Holds multiple audio/subtitle tracks
- Open and future-proof
- Great for high-quality storage
Limitations
- Not supported on many phones/browsers
- Often needs converting to play
- Larger than streaming formats
Best for: Archiving high-quality video with multiple tracks — converted to MP4 for everyday playback.