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Audio & Video Converters

File conversion

MP4 to MKV Converter

Convert MP4 video to MKV. Prepare a Matroska file for a player or workflow that requires that container.

MP4toMKV
Choose a file or drag it here
MP4, AVI, MOV, FLV, MKV, WebM, 3GP, MPEG, MPG, GIF, WMV, TS (up to 500 MB)

Choose your MP4 file, up to 500 MB. Keep your original until you check the result.

When to convert MP4 to MKV

Move a video into an MKV output through re-encoding. This workflow does not add subtitles, chapters, or new audio tracks.

What the output contains

The MKV output uses H.264 video and AAC audio. The converter does not offer subtitle or attachment controls.

Keep the original recording. The converter does not promise identical file size, metadata, or playback support across every application.

Before using the converted file

Compare the output with your MP4 before using it. Do not expect a lossless container-only change.

How to convert your MP4 file

  1. Upload the recording

    Choose your MP4 file from your device. The upload limit is 500 MB.

  2. Start the conversion

    The output is already set to MKV. Complete the verification and choose Convert.

  3. Download and check

    Wait for processing, then download the result. Open it in the application where you plan to use it.

MP4 to MKV questions

The MKV output uses H.264 video and AAC audio. The converter does not offer subtitle or attachment controls. Keep the original recording. The converter does not promise identical file size, metadata, or playback support across every application.
Compare the output with your MP4 before using it. Do not expect a lossless container-only change.
This converter accepts one uploaded file at a time. It does not retrieve media from website links or process batches.
This page selects MKV output automatically. It does not offer manual bitrate, resolution, trimming, or audio-track selection.
Conversion changes the file format. It does not restore missing detail, remove noise, or make a compressed recording lossless.

Related file conversions

MP4 to WMV

Convert MP4 files to WMV for compatibility, editing, or publishing.

MP4 to MPEG

Convert MP4 files to MPEG for compatibility, editing, or publishing.

MP4 to WebM

Convert MP4 files to WebM for compatibility, editing, or publishing.

MP4 to MOV

Convert MP4 files to MOV for compatibility, editing, or publishing.

MP4 to AVI

Convert MP4 files to AVI for compatibility, editing, or publishing.

MP4 to FLV

Convert MP4 to FLV for a legacy video system. Create an FLV copy while keeping the original MP4.

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