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What is MKV?

MKV (Matroska Video) is a flexible container format that supports virtually any codec, multiple subtitle tracks, and chapter markers.

What is FLV?

FLV (Flash Video) was the standard format for web video streaming before the rise of HTML5 video.

When Should You Use MKV vs FLV?

Use MKV When...

Reach for MKV when your priority is high-quality video with subtitles and chapters — its efficient compression makes sharing fast and storage minimal.

Use FLV When...

Reach for FLV when your priority is legacy web video, online streaming — its efficient compression makes sharing fast and storage minimal.

MKV vs FLV: Key Differences

  • •MKV and FLV diverge on compression: lossy compression for the source, lossy compression for the target.
  • •Both formats share lossy compression, so quality behavior is similar across the two — file size differences come from algorithm efficiency rather than compression philosophy.
  • •Alpha channel support: FLV lacks transparency support.
  • •Storage footprint: Varies greatly depending on content for MKV vs Comparable to MP4 for legacy content for FLV.
  • •Primary audience: MKV is built for high-quality video with subtitles and chapters scenarios, while FLV focuses on legacy web video, online streaming — pick the format that matches your output requirement.

Advantages of MKV

  • ✓MKV uses lossy compression tailored for High-quality video with subtitles and chapters.
  • ✓MKV is supported natively on virtually every device, browser, and operating system.
  • ✓MKV files are compact and quick to transfer, even over slow connections.
  • ✓MKV integrates seamlessly with all major creative tools and workflows.

Advantages of FLV

  • ✓FLV uses lossy compression tailored for Legacy web video, online streaming.
  • ✓FLV is supported natively on virtually every device, browser, and operating system.
  • ✓FLV files are compact and quick to transfer, even over slow connections.
  • ✓FLV integrates seamlessly with all major web development tools and workflows.

Common Use Cases for MKV to FLV Conversion

  • Marketing videos
  • Video archiving
  • Broadcast production
  • Video game cutscenes
  • Product demonstrations
  • Webinar recordings

Industry Applications

MarketingBroadcast MediaVideo SurveillanceGamingLive EventsVideo Conferencing

Best Practices for MKV to FLV Conversion

  • →Converting MKV to FLV: match the output resolution and bitrate to your target platform's requirements
  • →FLV provides broad compatibility across devices and platforms
  • →Use appropriate bitrate for the balance of quality and file size
  • →FLV is a lossy format, so expect some quality loss at higher compression ratios
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about MKV and FLV formats in our detailed guide.

Troubleshooting MKV to FLV Conversion

  • !Video stutters during playback of FLV → the frame rate may need adjustment; matching the source frame rate avoids judder
  • !Black bars appear around the converted FLV → check aspect ratio and cropping settings before re-encoding
  • !Subtitles vanished after MKV to FLV conversion → some containers handle subtitle tracks in separate streams
  • !FLV file won't upload to a streaming platform → verify the format, codec, and bitrate comply with the platform's specifications

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Convert MKV to FLV Online - Free & Fast

Convert MKV files to FLV online for free. High-quality conversion with no registration required.

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About MKV and FLV

MKV

MKV (MKV videos) - Matroska container with advanced subtitle and chapter support. Best for high-quality video with subtitles and chapters.

FLV

FLV (FLV videos) - Flash Video, legacy web video format. Ideal for legacy web video, online streaming.

Format Comparison

CompressionLossy → Lossy
TransparencyN/A
Use CaseConvert from high-quality video with subtitles and chapters to legacy web video, online streaming
File Size~Comparable to MP4 for legacy content after conversion

FAQs

Is converting MKV to FLV free?

Yes, GoConvertFile offers free conversion of MKV to FLV for files up to 100MB. No registration required.

How long does it take to convert MKV to FLV?

Most MKV to FLV conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is FLV best used for?

FLV is ideal for legacy web video, online streaming. Flash Video, legacy web video format

What file size should I expect after converting MKV to FLV?

File size after MKV to FLV conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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Tune output for this video conversion
80%
Smaller fileBetter quality