filoshi.com / formats / flv-to-mkv

Convert FLV to MKV

Extract audio, compress video, and change codecs natively without uploading. Convert FLV to MKV instantly.

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How to convert FLV to MKV for free

  1. 1
    Drop your FLV file
    Drag it onto the converter above, or click Browse Files to select it from your computer.
  2. 2
    Click Convert
    MKV is auto-selected. Hit Convert - FFmpeg.wasm processes everything locally in your browser.
  3. 3
    Download your file
    Your converted MKV file downloads instantly. Nothing was uploaded to a server.
Source Format

What is FLV?

Flash Video (.flv) - FLV was the standard for web video during the Flash era. Since Flash was discontinued in 2020, FLV files are rarely created but many archives still contain them.

Common use: Playing back archived Flash-era content

Output Format

What is MKV?

Matroska Video (.mkv) - MKV is an open-source container that can hold virtually any codec, multiple audio tracks, subtitles, and chapters in a single file. It is popular among video enthusiasts.

Common use: Archiving media, storing multi-language video, Blu-ray rips

Frequently Asked Questions

Is converting FLV to MKV free?+
Yes! You can convert FLV to MKV for free right in your browser using Filoshi's online converter. No signup or software download needed. For batch conversion of multiple files, the Filoshi desktop app is available for a one-time $14.90 payment.
Does converting FLV to MKV lose quality?+
It depends on the formats involved. If both FLV and MKV use lossless compression, no quality is lost. If the conversion involves a lossy format, some quality reduction may occur, but Filoshi uses optimized settings to keep quality loss minimal. The conversion runs entirely on your machine, so there are no server-side compression artifacts.
Can I convert FLV to MKV without uploading my file?+
Absolutely. Filoshi processes everything locally on your computer. Your FLV files are never uploaded to any server. Even the free browser converter runs entirely in your browser using WebAssembly, with no server involved.
How long does it take to convert FLV to MKV?+
Most conversions complete in seconds. Larger files (like high-resolution video) may take a bit longer depending on your computer's hardware. Since Filoshi runs locally, there is no upload or download wait time, which is significantly faster than online converters.
Can I batch convert multiple FLV files to MKV?+
Yes, the Filoshi desktop app supports batch conversion. You can drop an entire folder of FLV files, select MKV as the output format, and convert them all at once. Each file gets its own progress bar.

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Convert to MKV

Need batch FLV to MKV conversion?
The web converter handles 1 file at a time. Filoshi desktop converts unlimited files, runs offline, and supports 3,000+ formats.
Get Filoshi Desktop - $14.90