FLV → MKV
FLV to MKV
Convert FLV video to MKV with control over quality, resolution, and frame rate. Free and unlimited.
Drag & drop files here, or click to choose
.mp4,.mov,.webm,.mkv,.avi,.m4v,.mpg,.wmv,.3gp · up to 3 files
Files are sent over encrypted HTTPS, processed on our servers, and permanently deleted within 2 hours.
Need a different format? Open the full Convert Video to pick any output.
About converting FLV to MKV
FLV is the legacy Flash video format, now effectively obsolete. MKV is a flexible container that can hold multiple audio, video, and subtitle tracks in one file. Converting from FLV to MKV swaps one for the other without changing the underlying content.
Re-encoding video is lossy, so we use quality-preserving defaults — you can still tune the resolution, quality, and frame rate before you start.
How it works
- Choose your FLV file
- Pick your options
- Download the MKV
Frequently asked questions
How do I convert FLV to MKV?
Upload your FLV file above, and it converts to MKV in seconds. It's free, needs no sign-up, and there are no watermarks.
Is the FLV to MKV converter free?
Yes — completely free with no limits, no account, and no watermarks.
Will converting FLV to MKV reduce quality?
We use high-quality conversion settings to preserve as much fidelity as possible. You can often adjust quality options before converting.
Is it safe to convert FLV files here?
Yes. Files are deleted automatically within 2 hours and are never read or shared.