Convert FLV to MKV - Video Converter

Free online tool to convert FLV to MKV video format. Fast, private, browser-based conversion.

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Drop video files here or click to browse

Supports MP4, WebM, AVI, MOV, MKV, FLV, 3GP, MPEG, M4V, TS

Supported Formats

MP4

Most compatible video format

WEBM

Open web video format

AVI

Classic Windows video format

MOV

Apple QuickTime format

MKV

Flexible Matroska container

FLV

Flash video format

3GP

Mobile video format

MPEG

Classic digital video format

M4V

Apple video container

TS

Transport stream format

Features

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Privacy First

All conversions happen in your browser. Videos never leave your device.

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Multiple Formats

Support for all major video formats.

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Batch Conversion

Convert multiple videos at once.

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No Size Limit

Convert videos of any size (limited by browser memory).

Why Convert FLV to MKV?

Converting FLV to MKV brings your video into a modern format with better compression, wider device support, and improved streaming capabilities.

Flash Video (FLV)

Container

Legacy format originally designed for Adobe Flash Player.

Use Cases: VideoConverter.formatDetails.flv.useCases
Pros: VideoConverter.formatDetails.flv.pros
Cons: VideoConverter.formatDetails.flv.cons

Matroska Video (MKV)

Container

Flexible open format supporting multiple audio/subtitle tracks.

Use Cases: VideoConverter.formatDetails.mkv.useCases
Pros: VideoConverter.formatDetails.mkv.pros
Cons: VideoConverter.formatDetails.mkv.cons

How to Convert FLV to MKV

  1. Click the upload area or drag and drop your video file.
  2. Select the output format from the dropdown.
  3. Optionally adjust the resolution setting.
  4. Click "Convert All" to start processing.
  5. Download your converted video file.

FLV vs MKV โ€” Format Comparison

FormatTypeQualityFile SizeCompatibilityBest For
FLVContainerModerateSmallLow (legacy web)Legacy web content
MKVContainerHigh (any codec)MediumModerate (desktop players)Media collections, multiple tracks

Frequently Asked Questions

Is converting FLV to MKV free?

Yes, our FLV to MKV converter is completely free. All processing happens in your browser.

Will I lose video quality converting FLV to MKV?

There may be minimal quality loss during re-encoding. Using higher quality settings helps preserve the original quality.

How long does FLV to MKV conversion take?

Conversion time depends on file size, duration, and your device's processing power. Most short videos convert in under a minute.

Is my video file safe during FLV to MKV conversion?

Absolutely. All processing happens locally in your browser. Your video files are never uploaded to any server.

Can I batch convert multiple FLV files to MKV?

Yes, you can upload and convert multiple FLV files to MKV format simultaneously.