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File converter / Video / Convert to MP4 / MKV converter / MP4 to MKV

Convert MP4 to MKV

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Choose file to convert to .mkv
or drag and drop file

You can convert MP4 file to MKV as well as to variety of other formats with free online converter.

How to convert mp4 to mkv?

How to convert mkv to mp4?
Step 1

Upload mp4-file

Select mp4 file, which you want to convert, from your computer, Google Drive, Dropbox or drag and drop it on the page.
Step 2

Convert mp4 to mkv

Select mkv or any other format, which you want to convert.
Step 3

Download your mkv-file

Wait till your conversion process will be completed and click download converted mkv file.

Online and free mp4 to mkv converter

Fast and easy
Just drop your mp4 files on the page to convert mkv or you can convert it to more than 250 different file formats without registration, giving an email or watermark.
Don't worry about security
We delete uploaded mp4 files instantly and converted mkv files after 24 hours. All files transfer with secured an advanced level of SSL encryption.
All in the cloud
You don't need to install any software. All mp4 to mkv conversions make in the cloud and don't use any resources of your computer.

MPEG-4 Video File

File extension .mp4
File category video
Description The MP4 files (MPEG-4 part 14 files) are the multimedia files which are used with multiple stations and video players simultaneously, they can store not only digital audio streams and digital video but other suitable amounts of data like subtitle tracks. MP4 video format is an extremely common file format due to its very own container format and it is also used with multiple platforms such as iTunes, PlayStation, and portable PSP as well. It is also a popular file format for streaming over the Internet. For instance, YouTube videos have MP4 extension.
Technical details The technical details of MP4 files differ in great aspect and are unique as well, first released in 2001 under ISO/IEX 14496-1:2001 standards, it uses an AAC encoding to wear off unauthorized users from copying the data. The main purpose is the streaming rather than sending video or audio information. MP4 files can be used to store audio streams and, in addition, text information, subtitles and still images while MPEG format can’t do this, anyhow the processing of data into MPEG-4 part 14 requires the use of private streams such as the use of hint tracks to include the information.
Programs
Microsoft Windows Media Player
VLC media player
MPlayer
Eltima Elmedia Player
Winamp
Apple QuickTime Player
Apple iTunes
Developer Moving Picture Experts Group
MIME type
audio/mp4
video/mp4

Matroska Video File

File extension .mkv
File category video
Description MKV Matroska is an open source multimedia container format that supports more than one audio and subtitle tracks at the same file. It is the most convenient of file types where you can add a large sum of data, such as videos, audios, texts, and various images. It is basically a RAW format which you can later flip and separate on the basis of needed data tracks.
Technical details Every file whether it is video, audio, subtitle or image it will be stored into a separate data line. It is a lot similar to the MP4 or AVI format although when users are packaging an MKV file they rarely bundle all the tracks within the file. Various media players don't even support the MKV video format therefore, the users need to use specialized media players who can support the MKV format such as VLC media player.
Programs
VLC Media Player
Main program VLC Media Player
Developer Steve Lhomme
MIME type
video/x-matroska

FAQ

❓ How can I convert mp4 to mkv?
Firstly, select a mp4 file you want to convert or drag and drop it. Secondly, select mkv or any other format you want to convert your file to. Then click convert and wait until your file is converted
⏳ How long should I wait to convert mp4 to mkv?
Video conversion usually takes a few seconds. You will convert mp4 to mkv very quickly.
🛡️ Is it secure to convert mp4 to mkv on OnlineConvertFree?
Sure! We delete your uploaded and converted files, so nobody has access to your information. All types of conversion on OnlineConvertFree (including mp4 to mkv) is 100% safe.
📱 Can I convert mp4 to mkv without software installation?
Absolutely! OnlineConvertFree doesn’t require installation. You can convert any files (including mp4 to mkv) online on your computer or mobile.