Is it free to convert MP4 to MKV?

Yes, VideoConvert offers free MP4 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 MP4 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 MP4 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 MP4 to MKV

Convert MP4 files to Matroska MKV container for multi-track audio, subtitles, and chapter support. MKV is the preferred format for media servers and home theater setups.

100% Local Processing

No File Upload Required

MP4

MPEG-4 (H.264)

MKV

Matroska Video

Why Convert MP4 to MKV?

Supports multiple audio tracks and languages
Built-in subtitle track support (SRT, ASS, SSA)
Chapter markers for easy navigation
Open-source container with no licensing restrictions
Preferred format for Plex, Jellyfin, and Kodi

Common Use Cases

Organizing media for Plex or Jellyfin servers
Adding subtitle tracks to existing MP4 files
Archival with multiple audio languages
Home theater media library management

How to Convert MP4 to MKV

Open VideoConvert

Launch the app and drag your MP4 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?

Video Quality Presets Explained