Does converting MP4 to MKV affect video quality?

No, converting from MP4 to MKV using remuxing preserves the original video and audio streams without re-encoding, maintaining quality.

Will my MKV video play on all devices?

Playback depends on the codecs contained in the MKV file and the device support; some players and hardware do not fully support MKV.

Can I add subtitles or multiple audio tracks during the conversion?

Yes, MKV supports multiple subtitle and audio tracks as well as attachments like fonts, but support varies by player.

Convert Your Video to MKV Format Easily Online

Learn how to convert MP4 videos to MKV format using an online video converter. Discover the benefits, features, and best practices for converting your videos while preserving quality and multiple tracks.

Upload Your File | Maximum Size Upto 25MB

Quick Access To 21 MP4 File Conversion Pairs

What Is This Tool?

This tool allows you to convert video files from the widely used MP4 format to the versatile MKV format. It enables you to repackage your video streams, audio tracks, subtitles, and metadata without re-encoding, preserving original quality and adding flexibility for multiple audio and subtitle tracks.

How to Use This Tool?

Upload your MP4 video file to the converter.
Choose MKV as the output file format.
Configure any optional settings like including subtitle tracks or attachments if supported.
Start the conversion process and wait for the tool to repackage your video without re-encoding.
Download your new MKV video file ready for playback or archiving.

Key Features

Converts MP4 video containers to MKV without re-encoding to maintain video quality
Supports multiple audio, subtitle tracks, chapters, and metadata in one file
Based on an open, royalty-free format compatible with many playback apps
Flexible container supporting virtually any codec including H.264, HEVC, AAC, AV1, and more
Ideal for archiving high-quality videos with additional attachments like fonts

Examples

Convert an MP4 camera recording with H.264 video and AAC audio to MKV to add multiple subtitle tracks and font attachments without quality loss.
Remux a fragmented MP4 used for streaming into MKV to create a high-quality video release with chapters and multiple audio languages.

Common Use Cases

Distributing high-quality video releases that require multiple audio languages and subtitles.
Archiving movies, TV episodes, or home videos with rich metadata and attachments.
Creating screening copies with selectable subtitle formats and alternate audio commentary.
Storing screen captures or videos where lossless quality and multiple tracks are needed.

Tips & Best Practices

Ensure your target playback device or platform supports MKV before converting.
Use this tool to remux without re-encoding to preserve your original video and audio quality.
Add subtitle tracks and attachments carefully, knowing that not all players support advanced formats.
Re-encode only if necessary to change codecs for broader compatibility, understanding it may affect quality.

Limitations

Playback compatibility depends on the codecs inside the MKV; converting containers does not change codec support.
Some devices and platforms have limited or no native support for MKV files.
Adding or modifying codecs requires re-encoding, potentially reducing quality and increasing conversion time.
Advanced features like attachments and uncommon subtitle formats may not be supported by all players.

Frequently Asked Questions

Does converting MP4 to MKV affect video quality?: No, converting from MP4 to MKV using remuxing preserves the original video and audio streams without re-encoding, maintaining quality.
Will my MKV video play on all devices?: Playback depends on the codecs contained in the MKV file and the device support; some players and hardware do not fully support MKV.
Can I add subtitles or multiple audio tracks during the conversion?: Yes, MKV supports multiple subtitle and audio tracks as well as attachments like fonts, but support varies by player.

Key Terminology

MP4: A widely supported video container format that multiplexes video, audio, subtitles, and metadata for streaming and playback.
MKV (Matroska): An open, flexible multimedia container format that holds multiple video, audio, subtitle tracks, chapters, and attachments.
Remuxing: The process of repackaging video and audio streams into a different container format without altering the original encoding.

Quick Knowledge Check

What is a major advantage of converting MP4 files to MKV?

Automatic video compression to reduce file size

Ability to include multiple audio and subtitle tracks without re-encoding

MKV files play on every device without exceptions

Which statement best describes MP4 format?

It is an open container that supports any codec and subtitles

It is a standardized container used widely for video distribution and streaming

It only supports uncompressed video streams

What must you consider when playing an MKV file?

MKV files always require internet access to play

Playback compatibility depends on the codecs contained and player support

MKV files are smaller than MP4 files by default