MKV to MP4

Convert MKV to MP4 online and free

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I tried it and immediately fell in love! It was so easy to use! After a couple conversions I bought the guys a cup of coffee. A couple more and decided this was too good to abuse! I joined! My life is so much easier!


I had a huge, problematic file to convert that couldn't go through the usual automated conversion process. The Zamzar team responded quickly to my request for help, and they took the extra steps needed to do it manually.


Used it for over a year to convert my bank statements to csv files. Great quick app, increased my productivity a lot. Also, amazing support - always helped me quickly!

Agata Wierzbicka

I've used this product for years. And customer service is excellent. Just had an issue where I was charged and I didn't agree with the charge and they took care of it, even though they didn't have to.


I have been so thankful for Zamzar’s support from the beginning of the Pandemic to the present day. Their service is first rate & their helpfulness is always the best it could be.


A very useful and professional site. The service is easy to use and the administrators are helpful and courteous.

David Shelton

It’s my first time using it. I had some complications doing it. I’m not very good at this. But I wrote to the company and I had a lot of help. I’m satisfied with customer service and with the app.

Ana Suárez

I use Zamar whenever I need to convert audio and video files from multiple submitters to 1 uniform file format for Audio and Video Editing. I can do multiple large files in a short amount of time.

Christopher Bee

Great for when you need a lot of conversions in a short time. You have directly access and can even put the subscription on for just a month.

Sabina Calis

I feel like Zamzar is an active team member, especially for projects that I work on where I am the workhorse and it saves so much time and frustration. I am spoiled with Zamzar, because they have set the bar for file conversion and customer service very high.

Deborah Herman

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.

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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 files go by the full name of a Matroska Video File. MKV files were developed in Russia by Matroska in 2002 and are a popular video format, specifically with users who download video content the Internet. The name stems from the Russian word for Nesting Dolls, matryoshka because, like the Nesting Doll, an MKV file has many layers to it. First, the file itself is a multimedia container format which is made up of three parts, namely audio, video and text in the form of subtitles. These all form a single file but each element has its own type of encoding around it. MKV files are popular for a number of reasons, one being that they are open source and another being that they support multiple tracks within the same file and support almost any type of format meaning they’re very adaptable. Whilst popular, they are not universally supported. Indeed, only a handful of applications support the files including the VLC player and the MPlayer

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MP4 Video Format

MP4 Converter

An MP4, sometimes known as an MPEG4, is a multimedia file that is used to store video or audio data. MP4 files are typically smaller in size than other audio or video file types because MP4 files use a mix of compression technologies. Video and audio compression are usually handled by different codecs (audiovisual encoders). The video part is compressed with MPEG-4, a standard that was developed by Moving Picture Expert Group (MPEG), while the audio is typically compressed using AAC compression.

The explosion in popularity of the MP4 format is largely down to Apple and the iTunes Store, as it is the standard format for almost all of the media downloaded from the store. MP4 files are also typically seen when a video is downloaded from the internet.

MP4 files can normally be opened on your computer using Windows Media Player or QuickTime, and can be opened on mobile devices without the need to download any applications.

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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.