ChangeMyFile - Free Online File Converter

ChangeMyFile

Free MP4 to MKV Converter Online

Fast, Free, Secure & Simple

Looking for the best way to convert MP4 to MKV online for free? You’ve come to the right place. At Change My File, we offer a simple, lightning-fast, and user-friendly MP4 to MKV converter. Whether you're editing videos, saving space, or improving video compatibility, our tool gets the job done — no downloads, no watermarks, and no hidden fees.

Best MP4 to MKV Converter Online

Change My File is recognized as one of the best MP4 to MKV converters on the web. Why? Because we offer:

  1. Free MP4 to MKV conversion with no file size limits
  2. High-speed processing for large video files
  3. Easy drag-and-drop upload
  4. 100% secure and private – your files are never stored
  5. Works on all devices – Windows, Mac, Android, iOS

Why Convert MP4 to MKV?

Many users convert MP4 files to MKV to benefit from:

  1. Higher video quality with smaller file size
  2. Better subtitle and audio track support
  3. Compatibility with modern media players and devices
  4. Support for advanced features like chapter markers and multiple audio streams

How to Convert MP4 to MKV Free

Converting your video is quick and easy with Change My File:

  1. Upload your MP4 file by dragging it into the converter or clicking upload
  2. Our tool will instantly convert MP4 to MKV format
  3. Click Download and save your new MKV file

No sign-up required. No technical skills needed. 100% online.

Convert MP4 to MKV Without Losing Quality

Worried about video compression or losing resolution? Our online converter uses high-quality encoding to make sure your MP4 to MKV conversion keeps the best possible video and audio quality. Whether it's a short clip or a full-length movie, your content stays sharp and crystal clear.

Free Online MP4 to MKV Converter – No Software Needed

Say goodbye to heavy desktop software. Our online video converter works completely in your browser. Just open the page, upload your file, and you're done. It's the most convenient and reliable way to convert MP4 files to MKV format quickly and safely.

Convert MP4 to MKV Online Free – Anytime, Anywhere

Whether you’re at home, in the office, or on the go, our free MP4 to MKV converter is ready to use 24/7. No installation, no trial period — just fast, reliable conversions.

Frequently Asked Questions

Is Change My File really free to use?

Yes! Our MP4 to MKV converter is 100% free with unlimited usage.

Is it safe to upload my videos?

Absolutely. We use secure SSL encryption and do not store your files after conversion.

Will the MKV file keep subtitles or multiple audio tracks?

Yes! The MKV format supports advanced features like embedded subtitles, multi-language audio, and chapter navigation.

Start Converting MP4 to MKV Instantly!

Try the best MP4 to MKV online converter today — fast, free, and no signup required. Join thousands of users who trust Change My File for all their video format needs.

MP4 Technical Specifications

File extension.mp4
File categoryVideo
Stands forMPEG-4 Video stream
DeveloperMoving Picture Experts Group
OverviewIt stores multimedia data. It is commonly used by manufacturers (those produce mobile products) as well as by Apple for audio, video and still images. It offers higher flexibility and is compatible with both audio and video files. The Format provided by these files i.e MPEG-4 is commonly used online for streaming the videos. Any Movie, video or Audio file can be easily downloaded or streamed online with this extension which can be free or chargeable as well, such as downloading from iTunes. The payment can be made using credit or debit cards. These files may also include audio books, photos, podcasts, songs, movies, not making them limited to just audios and videos. This format has become more common as they are being used in iPod and PlayStation Portable(PSP). Commonly portable media players are advertised as “MP4 players” although they are capable of playing other media format as well like ‘AMV format'.
Technical descriptionMPEG-4 files are officially named under extension .mp4 and this is the only official extension for MPEG-4 PART-14 formats. These files were introduced in 2001 under the standards of ISO/IEX 14496-1:2001. It runs on AAC encoding which restricts the users from copying the data of the files. The data embedding can be done on these files using any private stream. For instance, hint tracks to add the streaming information into the file. These files are similar to most of the modern containers containing data information which allows internet streaming.
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MKV Technical Specifications

File extension.mkv
File categoryVideo
Stands forMatroska Multimedia Container
DeveloperSteve Lhomme
OverviewAn unlimited amount of data such as an infinite number of audios, videos, pictures, arbitrary files like XML and subtitle tracks can be stored in MKV files. Although, it has a similar concept that of AVI, MP4; etc., yet, there is one difference. It is an open-source software or has open specifications, whereas, others are different. Furthermore, it allows online streaming and fast seeking which are alluring features. It can be used with ease as it is highly adaptive and can accept any audio and video.
Technical descriptionFiles in MKV format store each track in varied dataline. Files in this format use distinctive extensions for storing the data. The extension .MKV is used only for video files(may have subtitles and audio),.MK3D for stereoscopic video, .MKA and .MKS for audio and subtitles respectively. The codecs that are linked to this format are .SRT, Vobsub, .USF(Universal Subtitle Format) and .SSA; etc. It should be noted that not all the media players support this file format but only selective ones like VLC. Besides this, ‘Matroska' is derived from a Russian word that is ‘Matryoshka’ and it refers to a hollow Russian doll which opens to uncover another doll, this doll then again opens to reveal next doll and the process goes on. Other meanings for this word in Russia are a sailor suit and a female sailor. Technical details in depth are available only for private and commercial use.
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MP4 To Other Extensions

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