Free Online MP4 to MKV Converter

Extract audio from your MP4 file using our fast and free MP4 to MKV converter. Use our MP4 ripping tool to separate out the audio track from your uploaded MP4, which can then be downloaded as an independent MKV file. You can also batch rip MP4 files with our batch MP4 to MKV converter, where you can upload as many as 20 files at a time.

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Select File(s)

Or drag and drop your files here to upload.
A maximum of 20 files can be uploaded at once.

Please note: Your MP4 file, once uploaded to our server, will be deleted 15 minutes after upload, so please download your converted MP4 file before this time.

Click the button above and select the MP4 video files you want to rip the audio from. Once selected, you can alter the bitrate of the generated MKV file by clicking button if you want to. The default settings will leave the audio quality unchanged.

How to Convert your MP4 to MKV Online?

Here are two simple steps to convert your MP4 to MKV using our fast and free MP4 converter tool.

Upload your MP4 file

Click the "Upload a MP4 File" button, then select a MP4 to upload. The maximum file size is 100MB.

Download your MKV

Click the download link to receive your MKV file.

Frequently Asked Questions

How can I convert my MP4 file to MKV?

First, click the "Upload..." button and select your MP4 file to upload. Your MP4 file will be uploaded to our servers. When the MP4 to MKV conversion has completed, you can download your MKV file right away.

How long does it take to convert my MP4 to MKV?

We aim to process all MP4 to MKV conversions as quickly as possible; this usually takes around 5 seconds; however, this can be longer for certain files, so please be patient.

How accurate is the MP4 to MKV conversion?

We aim to provide the best conversion experience. Our tools are under constant review and development, with new features being added every week.

File format information for MP4 and MKV

Extension	MP4
Full Name	MPEG-4
Type	Video
Mime Type	video/mp4
Format	Binary

An MP4 file is a modern standard format for storing high-quality motion video in a highly compact and efficient file size. The specific compression algorithm used within an MP4 file can vary from file to file; however, they all enable what would otherwise be a large amount of uncompressed data to be reduced to a fraction of the original size with little or no noticeable difference in playback quality.

Due to their widespread support, MP4 files can be loaded into most video editing applications and played with most video playback software with no additional drivers. Most video sharing sites, such as YouTube, support MP4 as a format when uploading, and most tablets and smart phones can record in the MP4 format.

Audio stored within an MP4 file is usually stored in the MP3 format, taking advantage of that format's high quality and compression capabilities.

Extension	MKV
Full Name	Matroska Multimedia Container
Type	Video
Mime Type	video/x-matroska
Format	Binary

An MKV file, or Matroska Video File, is an audio/video file format created to store multimedia data in a highly compressed format. The MKV format supports a wide variety of audio and video codecs and is a popular format for distributing video files.

The format itself is a container format, meaning it supports many different audio and video tracks, all using different codecs. Along with audio and video, other data, such as chapters, markers, sub-titles, and other useful data, can be stored within the file.

Support for editing MKV files is widespread, with most video editing applications able to open MKV files. Video playback software, however, can sometimes struggle to playback MKV files if they are not equipped with the correct codecs.

Information for converting from MP4 to MKV

Our MP4 and MKV will attempt to convert these video format files with little or no loss in quality. You can upload video files up to 100MB in size; however, with large MP4 files, please allow time for converting to a MKV.