Convert FLV to MKV
Free online FLV (.flv) to MKV (.mkv) converter. No signup. No watermark. Files deleted after 1 hour.
Drop files here or click to upload
or browse files
How to convert FLV to MKV
- Drop your .flv file in the upload area above.
- Click Convert FLV to MKV and wait a few seconds.
- Download the resulting .mkv file.
About FLV and MKV
FLV (.flv) is a video format. Converting it to MKV (.mkv) is useful when you need a format that is more widely supported, easier to edit, or smaller in size. DocumentBuddy runs the conversion server-side using battle-tested open-source tools so the output matches what you would get from a desktop application.
Frequently asked questions
Is the FLV to MKV converter free?
Yes — free for up to 2 conversions per day. The Day Pass ($3) unlocks unlimited use for 24 hours; Pro ($9/mo) is unlimited.
What happens to my files?
Uploaded files and conversion outputs are deleted from our servers within one hour. We never share or sell files.
Do I need to install anything?
No — everything runs in the browser. Works on Mac, Windows, Linux, iPhone, and Android.
Is there a file size limit?
Files up to 100 MB are supported on every plan.
Related conversions
Other ways to convert FLV:
Other ways to get MKV: