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HomeFLV vs MKV
.flv
.mkv

FLV vs MKV

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

Format Overview

FLV

Flash Video

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

.flvvideo

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 vs MKV: Feature Comparison

FeatureFLVMKV
Full NameFlash VideoMatroska Video
File Extension.flv.mkv
Categoryvideovideo
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use FLV vs MKV

Use FLV when you need:

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

Use MKV when you need:

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

Convert Between Them

FLV MKVMKV FLV
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Learn More About These Formats

FLV Converter MKV Converter

Frequently Asked Questions

What is the difference between FLV and MKV?
FLV (Flash Video) and MKV (Matroska Video) are both video file formats. FLV files use the .flv extension while MKV uses .mkv. They differ in compression, quality, compatibility, and intended use cases.
Can I convert FLV to MKV for free?
Yes! Convert999 lets you convert FLV to MKV 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, FLV or MKV?
It depends on your use case. FLV (Flash Video) may be better for certain workflows, while MKV (Matroska 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.

FLV Converter

Convert from FLV

MKV Converter

Convert from MKV

File Tools

Compress, resize, merge

Convert to FLV

All sources → FLV

Convert to MKV

All sources → MKV

Format Statistics

Trends & data 2025

More Format Comparisons

JPGvsPNGPNGvsWEBPJPGvsWEBPSVGvsPNGHEICvsJPGBMPvsJPGTIFFvsJPGGIFvsPNG