Is it free to convert FLV to MKV?

Yes, VideoConvert offers free FLV to MKV conversion. The free tier supports MP4 output at up to 720p. Pro users get all formats, 4K resolution, batch conversion, and no watermark for a one-time $29 payment.

Does converting FLV to MKV lose quality?

VideoConvert uses FFmpeg with configurable quality presets. The High preset (CRF 18) produces output that is visually indistinguishable from the source. You control the quality-to-size tradeoff with four presets: High, Medium, Low, and Draft.

Do I need to upload my video to a server?

No. VideoConvert processes everything locally on your computer. Your video files never leave your device, ensuring complete privacy and eliminating upload wait times.

How long does FLV to MKV conversion take?

Conversion speed depends on file size, resolution, and your computer's hardware. A typical 1080p video converts in seconds to a few minutes. Local processing is often faster than cloud services because there is no upload or download step.

Format Conversion

Convert FLV to MKV

Convert Flash Video FLV files to the modern MKV container. MKV supports multiple audio tracks, subtitles, and chapters — making it ideal for archiving and media server use.

100% Local Processing

No File Upload Required

FLV

Flash Video

MKV

Matroska Video

Why Convert FLV to MKV?

Supports multiple audio tracks and subtitle streams
Lossless quality preservation during remux
Chapter and metadata support for organized libraries
Widely supported by media players (VLC, Kodi, Plex)
Open-source and royalty-free container format

Common Use Cases

Archiving Flash video collections in a modern format
Organizing video libraries with subtitle tracks
Converting old web videos for Plex or Kodi
Preserving Flash-era content with full fidelity

How to Convert FLV to MKV

Open VideoConvert

Launch the app and drag your FLV file into the upload area.

Select MKV Format

Choose MKV as your output format from the format selector.

Convert & Download

Click Convert and your file is ready. No cloud upload needed.

Frequently Asked Questions

MKV vs MP4: Which Container to Use?

Why Local Video Processing Matters