Convert MP4 to MKV Online

About MP4 (source)

MP4 (MPEG-4 Part 14) is the default video container for phones, TVs, browsers, social platforms, and most editors. It typically wraps H.264 or HEVC video with AAC audio. MP4 is what YouTube, Instagram, Google Drive, and iOS expect when you upload or share video.

Where MP4 shows up:

• Playback on iPhone, Android, smart TVs, and game consoles
• Uploading to YouTube, TikTok, Vimeo, and corporate LMS systems
• Editing in DaVinci Resolve, Premiere Pro, and mobile editors
• Email attachments and messaging apps with strict format lists

About MKV (target)

MKV (Matroska) is an open, highly flexible container built for archival and home theater use. It supports multiple video, audio, and subtitle tracks in one file, plus chapters and attachments. MKV is common for Blu-ray rips, anime fansubs, and Plex/Kodi libraries.

Where MKV is used:

• Blu-ray and DVD rips with commentary and multiple languages
• Anime and foreign films with soft subtitles
• Plex, Jellyfin, and Kodi media servers
• Preserving multiple audio tracks without splitting files

Converting MP4 to MKV

Pros

• Keeps multiple audio and subtitle tracks in one file
• Open format with excellent Plex/Kodi support

Cons

• Not natively supported on iPhone or many TVs
• Social platforms often reject MKV uploads

Caveats

• Remuxing from MP4 to MKV may preserve quality when codecs match. MKV still supports fewer subtitle types than MKV when the target is MOV.
• Muxara maps the primary video and audio streams. Extra subtitle or audio tracks may not carry over unless you choose subtitle handling in the converter settings.
• Uploads are processed on dedicated workers and deleted within 24 hours. For offline batch work, use the free Muxara Mac app.