FLV to MKV Converter

Batch convert flv files to mkv online. Change flv to mkv on Windows, Mac, iPhone and Android in 2 clicks.

Select files for conversion or drag and drop them to the upload area.
Your files are securely protected and available only to you.
All files are automatically deleted from our servers after 1 hour.

How to convert FLV files to MKV online?

Step-by-step instructions for converting flv files to mkv

Upload FLV-file

Click "Choose File" button to select a flv file on your computer. FLV file size can be up to 100 Mb.

Convert FLV to MKV

Click "Convert" button to start conversion.

Download your MKV

When the conversion process is complete, you can download the MKV file.


  • ❓ How can I convert FLV to MKV?
    First you need to add file for conversion: drag and drop your FLV file or click the "Choose File" button. Then click the "Convert" button. When FLV to MKV conversion is completed, you can download your MKV file.
  • ⏱️ How long does it take to convert FLV to MKV?
    Video conversion takes quite a while. It will probably take you a few minutes to change FLV to MKV.
  • 🛡️ Is it safe to convert FLV to MKV on AnyConv?
    Of course! We delete uploaded files immediately, and converted ones after 1 hour. No one has access to your files. File conversion (including FLV to MKV) is absolutely safe.
  • 💻 Can I convert FLV to MKV on Mac OS or Linux?
    Yes, you can use AnyConv on any operating system that has a web browser. Our FLV to MKV converter works online and does not require software installation.

Information about FLV and MKV file formats

Full name FLV - Flash Video MKV - Matroska
File extension .flv, .f4v, .f4p, .f4a, .f4b .mkv, .mk3d, .mka, .mks
MIME type video/x-flv video/x-matroska, audio/x-matroska
Developed by Adobe Systems www.matroska.org
Type of format Media container Container format
Description Flash Video is a container file format used to deliver video over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. Flash Video used to be the de facto standard for web-based streaming video. Notable users of it include Hulu, VEVO, Yahoo! Video, Metacafe, Reuters.com, and many other news providers. The Matroska Multimedia Container is an open standard free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is intended to serve as a universal format for storing common multimedia content, like movies or TV shows.
Technical details There are two different video file formats known as Flash Video: FLV and F4V. The audio and video data within FLV files are encoded in the same manner within SWF files. The F4V file format is based on the ISO base media file format and starts with Flash Player 9 update 3. Both formats are supported in Adobe Flash Player and developed by Adobe Systems. Matroska is similar in concept to other containers like AVI, MP4, or Advanced Systems Format (ASF) but is entirely open in specification, with implementations consisting mostly of open-source software.
File conversion FLV conversion MKV conversion
Associated programs Adobe Flash Player VLC Media Player
Wiki https://en.wikipedia.org/wiki/Flash_Video https://en.wikipedia.org/wiki/Matroska
FLV to MKV conversion quality rating:
4.8 (122 votes)
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