MKV to MP4

Convert MKV to MP4 online and free

Step 2 - Convert your files to

Or choose a different format

Step 3 - Start converting

(And agree to our Terms)

Trusted by employees at these brands

Employees of some of the world's most well-known brands rely on Zamzar to convert their files safely and efficiently, ensuring they have the formats they need for the job at hand. From global corporations and media companies, to respected educational establishments and newspaper publications, employees of these organisations trust Zamzar to provide the accurate and reliable conversion service they need.

Philips logo BBC logo Amazon logo Netflix logo Harvard logo Microsoft logo Discovery logo Shell logo Colombia logo Siemens logo Sky logo Princeton logo

Your files are in safe hands

Zamzar has converted over 510 million files since 2006

For every 10,000 files converted on Zamzar, we'll plant a tree. By using Zamzar you are helping to make a difference to our planet

We're committed to regular charitable giving. Each month we donate at least 2% of our company profits to different charities

From your personal desktop to your business files, we've got you covered

We offer a range of tools, to help you convert your files in the most convenient way for you. As well as our online file conversion service, we also offer a desktop app for file conversions straight from your desktop, and an API for automated file conversions for developers. Which tool you use is up to you!

Want to convert files straight from your desktop?

Get the App

Fully integrated into your desktop

Convert over 150 different file formats

Convert documents, videos, audio files in one click

Need conversion functionality within your application?

Explore the API

One simple API to convert files

100s of formats for you to choose from

Documents, videos, audios, images & more...

Why choose Zamzar?

With Zamzar, file conversions are easy, reliable and convenient, so you can quickly convert your documents, images, videos, and more, to the formats you need. With faster downloads of converted files, and friendly and helpful support when you need it, you'll have everything you need to work with your files.

The addition of real-time conversions to the site means that you get your files converted that much more quickly.


The addition of real-time conversions to the site means that you get your files converted that much more quickly.

You upload your file to Zamzar, and we convert it for you and then pass it back for you to download. The whole process occurs online and means you don

Cloud Based

You upload your file to Zamzar, and we convert it for you and then pass it back for you to download. The whole process occurs online and means you don't have to leave the browser.


Millions of Conversions Monthly

Zamzar's popularity grows daily and so does the number of files that get converted!

We know you might need to convert files while on the move, which is why our conversion tool works on both phone and tablet.

Any Device

We know you might need to convert files while on the move, which is why our conversion tool works on both phone and tablet.

Tools to suit your file conversion and file compression needs

You'll find all the conversion and compression tools you need, all in one place, at Zamzar. With over 1100 file-conversion types supported, whether you need to convert videos, audio, documents or images, you'll easily find what you need and soon have your files in the formats and sizing that work for you.

MKV Video Format

MKV Converter

MKV is an audio-visual file format, and the name MKV stands for Matroska Video File. Matryoshkas are Russian dolls, and, like several other video formats, MKVs are container files that can have audio, video, subtitles and metadata ‘nesting’ within them. While it’s not necessarily an industry standard like MP4, MKV is an open-source format that doesn’t belong to one single tech company.

MKV files are not compressed, so they can be much larger files than some other video formats like MP4, although the quality can be higher. Users can also ‘mix and match’ the audio and video elements in the file, or have multiple audio tracks (e.g. for different languages). These features make MKV popular with some filmmakers and editors. Not all media players support MKV. However, MKV videos will usually play on Windows 10, and with VLC and MPlayer, and you can install MKV codecs for other players.

Related Tools

MP4 Video Format

MP4 Converter

MP4, sometimes called MPEG4, is one of the most common video formats. MP4 was developed to be easily played and shared. It was originally developed by the Moving Picture Experts Group (MPEG) but has become an ISO standard, meaning that it’s now maintained by the International Organisation for Standardization. As MP4 is a standardised format, it will normally play easily on most devices and media players, including Windows Media Player, QuickTime, and VLC. MP4 is usually the preferred format for uploading videos to YouTube, Vimeo or other websites.

MP4 videos are made up of video and audio elements that are compressed separately. The video part is usually compressed with MPEG-4, and the audio is usually compressed using AAC, which is the audio format associated with iTunes. Because both file elements are compressed, MP4s normally have a smaller file size than many other video formats, but still maintain relatively high quality for sharing online.

Related Tools

How to convert a MKV to a MP4 file?

  1. 1. Choose the MKV file that you want to convert.
  2. 2. Select MP4 as the the format you want to convert your MKV file to.
  3. 3. Click "Convert" to convert your MKV file.

Convert from MKV

Using Zamzar, it is possible to convert MKV files to a variety of other formats:


Frequently asked questions

If you’ve got any questions about converting or compressing files with Zamzar, we’re happy to help! We’ve answered a few commonly-asked questions below, to get you started, and you can find out more information about file conversion and compression with Zamzar, in our Help centre.

It’s easy to change a file from MKV to MP4 using a free online conversion tool like the one on Zamzar’s website. Simply upload your MKV file, choose MP4 as the format to convert to, and then select ‘Convert Now’. You'll then be able to download your converted file.

Other ways to change MKV to MP4 include by using downloaded file conversion software, such as HandBrake. There are also some video players that can convert files, like VLC media player. However, Zamzar is free and secure, and because the three-step conversion tool sits on a website, there’s no need to install extra software or apps.

A great way to convert MKV to MP4 for free is to use an online conversion tool. The easy three-step converter on Zamzar’s website lets you upload an MKV file, select the format you want it to be converted to, and then download it. You don’t need to install any specialist software or apps, and you can download your new MP4 video file in a few clicks, so it’s ready to play, edit or share. Because you can’t upload MKV files straight to YouTube, you would need to convert them to MP4 first – Zamzar makes that easy.

Other free options include installing a conversion software, such as HandBrake, on your computer, and then using this to convert your MKV file. This software will take up extra space on your device, though.

Online conversion tools like the one provided by Zamzar are one of the fastest ways you can convert MKV files to MP4. It’s just three steps – upload your MKV file to Zamzar’s website, select ‘Convert Now’, and then download your video in MP4 format.

There are also some media players that have a conversion feature, such as VLC media player. The advantage of conversion websites like Zamzar, though, is that you don’t need to install anything new on your device, so this saves time.

You can usually watch MKV videos on Windows 10, but to convert them you need a specialist tool like the one on Zamzar’s website. Using Zamzar, you just need to upload your MKV file, select MP4, then click ‘Convert Now’. The MP4 version of your video will then be ready to download.

You can also convert MKV files using conversion software, such as HandBrake, or using a media player, such as VLC. However, if you install software rather than using a website, the software will take up extra space on your device.

MP4 files are normally smaller than MKV files, so video quality can sometimes be affected if you’re not using a trusted conversion tool like Zamzar. However, you should be able to convert MKV files to MP4 with Zamzar, without losing any discernible quality. Zamzar’s site is also really easy to use, with the three-step online tool. Simply upload your MKV file, select the format you want to convert it to, and then download your video.