MP4 to MKV Converter Online — Convert Video Format Free

Need the flexibility of MKV format? The MyPDF MP4 to MKV converter repackages your MP4 videos into Matroska containers — supporting multiple audio tracks, subtitles, and chapters in a single file.

How to Convert MP4 to MKV

1. Upload your MP4 video file.
2. Configure settings — add subtitle tracks or select audio streams if desired.
3. Download the MKV file instantly.

MP4 vs. MKV Comparison

Feature	MP4	MKV
Audio tracks	Limited	Unlimited
Subtitle tracks	Limited	Unlimited
Chapters	Basic	Full support
Codec support	H.264, H.265, AAC	Nearly any codec
Device compatibility	Universal	Desktop, smart TVs
Streaming	Better	Limited

Practical Tips

• MKV is ideal for archival — it can hold multiple audio languages, subtitle tracks, and chapter markers in one file.
• The conversion can be lossless — if only repackaging the container without re-encoding, video quality is identical.
• Use MKV for Plex and Kodi — media server software works excellently with MKV files.

Why convert MP4 to MKV?

MKV supports more audio/subtitle tracks, more codecs, and better chapter support. It is preferred for media libraries, especially when you need multiple language tracks.

Will converting reduce quality?

No, when using stream copy mode. The video and audio streams are copied directly into the MKV container without re-encoding.

Related Tools

• MKV to MP4 — convert MKV back to MP4
• Convert Video — convert between any formats
• Video Compress — compress video files
• Video Subtitles — burn in subtitles