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HomeMKV vs FLV
.mkv
.flv

MKV vs FLV

Compare Matroska Video and Flash Video formats — understand the key differences and when to use each

Format Overview

MKV

Matroska Video

MKV (Matroska Video) is an open-source, flexible video container format created in 2002. MKV can hold virtually unlimited video, audio, subtitle, and attachment tracks in a single file, making it the most versatile video container available. It supports every major video codec (H.264, H.265, VP9, AV1), audio codec (AAC, FLAC, DTS, TrueHD, Atmos), and subtitle format (SRT, ASS, PGS). MKV is the preferred format for high-quality video collections, Blu-ray rips, and anime with multiple audio and subtitle tracks. It supports chapters, menus, metadata, and attached fonts. While MKV has excellent software support (VLC, MPV, Plex), some hardware devices and smart TVs have limited MKV compatibility. For maximum compatibility, converting MKV to MP4 is recommended.

.mkvvideo

FLV

Flash Video

Flash Video (.flv) is a video file format.

.flvvideo

MKV vs FLV: Feature Comparison

FeatureMKVFLV
Full NameMatroska VideoFlash Video
File Extension.mkv.flv
Categoryvideovideo
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use MKV vs FLV

Use MKV when you need:

  • •Files in Matroska Video format for maximum compatibility
  • •Industry-standard video format support
  • •Wide software and platform compatibility

Use FLV when you need:

  • •Files in Flash Video format for specific workflows
  • •Optimized video format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

MKV FLVFLV MKV
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Learn More About These Formats

MKV Converter FLV Converter

Frequently Asked Questions

What is the difference between MKV and FLV?
MKV (Matroska Video) and FLV (Flash Video) are both video file formats. MKV files use the .mkv extension while FLV uses .flv. They differ in compression, quality, compatibility, and intended use cases.
Can I convert MKV to FLV for free?
Yes! Convert999 lets you convert MKV to FLV completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, MKV or FLV?
It depends on your use case. MKV (Matroska Video) may be better for certain workflows, while FLV (Flash Video) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

MKV Converter

Convert from MKV

FLV Converter

Convert from FLV

File Tools

Compress, resize, merge

Convert to MKV

All sources → MKV

Convert to FLV

All sources → FLV

Format Statistics

Trends & data 2025

More Format Comparisons

JPGvsPNGPNGvsWEBPJPGvsWEBPSVGvsPNGHEICvsJPGBMPvsJPGTIFFvsJPGGIFvsPNG