How to convert Flash Video (FLV) to Matroska (MKV)
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert Flash Video (FLV) to Matroska (MKV)
NexMedia converts Flash Video (FLV) to Matroska (MKV) on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About Flash Video (FLV)
Flash Video (FLV) is the container Adobe Flash Player used to stream video on the web, typically with H.264 or the older Sorenson Spark and VP6 codecs.
Videos saved from websites of the Flash era and from some older streaming and recording tools.
Adobe ended Flash Player at the end of 2020 and browsers removed it, so FLV files need a converter or a desktop player such as VLC.
Convert FLV to MKV online free, no account required — MKV is a flexible open container for video with any number of audio and subtitle tracks.
Change FLV to MKV without losing quality — convert FLV to MKV free in your browser.
Why won't my old FLV videos play anywhere anymore? Flash Player was retired at the end of 2020 and browsers dropped support, so the only practical way to keep them is converting to MP4.
About Matroska (MKV)
Matroska (MKV) is an open container format that can hold almost any video and audio codec, any number of audio and subtitle tracks, chapters and attachments.
It is popular for films and series with several audio languages and subtitle tracks, and for archiving video.
Many phones, browsers and TVs do not play MKV files directly, even when they support the codecs inside.
Why convert video to MKV? When one file must carry several audio languages, subtitle tracks and chapters, no container holds them as flexibly.
What changes when you convert FLV to MKV
- The FLV is re-encoded into MKV at the default quality settings, so the result looks close to the original but is not bit-identical.
Settings you can change
Before you convert FLV to MKV, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted MKV file is kept for 2 hours, then deleted.
FLV to MKV: questions and answers
Does converting FLV to MKV reduce quality?
The FLV is re-encoded into MKV at the default quality settings, so the result looks close to the original but is not bit-identical.
What is the difference between FLV and MKV?
FLV is the Flash Video format of the Adobe Flash Player era. MKV is a flexible open container for video with any number of audio and subtitle tracks.
Can I change the settings when converting FLV to MKV?
Before you convert FLV to MKV, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Do I need an account to convert FLV to MKV?
No. You can convert FLV to MKV without an account; signing in raises the file-size and daily limits.
How long is my converted MKV file kept?
The MKV file you convert from FLV is kept for 2 hours, then deleted automatically.
When I convert FLV to MKV, is the video re-encoded?
The FLV is re-encoded into MKV at the default quality settings, so the result looks close to the original but is not bit-identical.
Will converting FLV to MKV change my original file?
No. The conversion reads your FLV and writes a new MKV file, leaving your original FLV file untouched.