FLV vs Matroska: Which Should You Use?

Side-by-side comparison of FLV and Matroska video formats — features, pros, cons, and conversion options.

Quick Answer

FLV is best for Legacy Flash-based web video (largely obsolete). Matroska is best for High-quality video archival with multiple audio and subtitle tracks.

Quick Verdict

FLV Best for Legacy Flash-based web video (largely obsolete)

✓ Small file size
✓ Fast loading
✓ Flash Player legacy support
✗ Flash is deprecated

Convert FLV to Matroska →

Matroska Best for High-quality video archival with multiple audio and subtitle tracks

✓ Supports virtually any codec
✓ Multiple audio/subtitle tracks
✓ Open standard
✗ Limited hardware player support

Convert Matroska to FLV →

Specs Comparison

Side-by-side technical comparison of FLV and Matroska

Feature	FLV	Matroska
Category	Video	Video
Year Introduced	2003	2002
MIME Type	video/x-flv	video/x-matroska
Extensions	.flv	.mkv
Container	✓	✓
Codecs	H.264,VP6,Sorenson Spark	H.264,H.265,VP9,AV1,virtually any codec
Max Resolution	1080p	8K
Streaming	✓	✗
Subtitle Support	✗	✓

Pros & Cons

FLV

Pros

✓ Small file size
✓ Fast loading
✓ Flash Player legacy support

Cons

✗ Flash is deprecated
✗ Poor mobile support
✗ Limited modern use

Matroska

Pros

✓ Supports virtually any codec
✓ Multiple audio/subtitle tracks
✓ Open standard

Cons

✗ Limited hardware player support
✗ Not ideal for streaming
✗ Larger overhead than MP4

When to Use Each

Choose FLV when...

You need files optimized for Legacy Flash-based web video (largely obsolete)
Small file size
Fast loading

Choose Matroska when...

You need files optimized for High-quality video archival with multiple audio and subtitle tracks
Supports virtually any codec
Multiple audio/subtitle tracks

How to Convert

Convert between FLV and Matroska for free on ChangeThisFile

Convert FLV to Matroska Server-side conversion — auto-deleted after processing Convert Matroska to FLV Server-side conversion — auto-deleted after processing

Frequently Asked Questions

What's the difference between FLV and Matroska?

FLV is best for Legacy Flash-based web video (largely obsolete), while Matroska is best for High-quality video archival with multiple audio and subtitle tracks. Both are video formats but they differ in compression, compatibility, and intended use cases.

Is FLV or Matroska better for video?

It depends on your use case. FLV is better for Legacy Flash-based web video (largely obsolete). Matroska is better for High-quality video archival with multiple audio and subtitle tracks. Consider your specific requirements when choosing between them.

How do I convert FLV to Matroska?

Go to the FLV to Matroska converter on ChangeThisFile. Upload your file and the conversion processes on the server, then auto-deletes. It's free with no signup required.

Can I convert Matroska to FLV?

Yes. ChangeThisFile supports Matroska to FLV conversion. Upload your file for server-side conversion — files are auto-deleted after processing.

Which is smaller, FLV or Matroska?

File size varies depending on the content, compression method, and quality settings of each format. In general, lossy formats produce smaller files than lossless ones. Test with your specific files to compare actual sizes.

Does FLV support streaming?

Yes, FLV supports streaming, but Matroska does not. This may be important depending on your use case.

Is FLV or Matroska free to use?

Both FLV and Matroska are supported file formats that are free to use. You can convert between them for free on ChangeThisFile — server-side conversions are free with no signup required.

Which format is newer, FLV or Matroska?

FLV is newer — it was introduced in 2003, while Matroska dates back to 2002. Newer formats often offer better compression and features, but older formats tend to have wider compatibility.