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Convert MKV to MP4 Online


CONVERT MKV to MP4 ONLINE

1) Upload MKV file to convert

 

Drop files here, or Click to select
0 %

2) Set converting MKV to MP4 options

Convert to

 

Options

Width: Height:
Constrain proportions

3) Get converted file

DOWNLOAD CONVERTED FILE
Full version
Get Total Movie Converter to convert your videos safely.

Total Movie Converter To Convert videos
  • Convert Videos in Batch!;
  • Convert MKV to MP4 and in many other formats
  • Convert several files in 3 clicks;
  • Have a desktop converter that works without Internet;
  • Keep your files safe, don't send them to the web;
  • Get faster results with the more poweful engine.
See features
NOW 20% OFF - $29.90 $20.93
*Only this month. Not for resellers.
close Total Movie Converter Total Movie Converter is a handy solution to convert video files of almost all popular video codecs toAVI, MPG, WMV, MPEG, FLV. In addition, Total Movie Converter is great for converting video for iPad, iPhone, Apple TV, Archos, XBox and others thanks to the new Video To Device feature.
ok If you make home videos with a HD camera Total Movie Converter will make your videos suitable for the web in two clicks.
ok Use this powerful video converter to rotate your videos or resize them.
ok Total Movie Converter converts video from YouTube, Vimeo, and Sevenload. All you have to do is enter the url.
ok The video converter can also change the codec or system type between all popular video formats. You can also adjust Audio\Video bitrate, Frame Rate, cut any piece of your movie or combine video.

How to convert MKV to MP4?

1

💾 Upload Your File: Go to the site, click on «Upload File,» and select your MKV file.

2

✍️ Set Conversion Options: Choose MP4 as the output format and adjust any additional options if needed.

3

Convert and Download: Click 👉«Download Converted File»👈 to get your MP4 file.

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Cloud Based
There is no need to install any software to convert MKV to MP4 with CoolUtils. Simply access the internet, and you can easily convert your file online with our service.
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Secure
Our hardware operates in top-tier, highly secure data centers equipped with advanced electronic surveillance and multi-factor access control systems.
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Ease of Use
Converting MKV to MP4 online has never been so simple. Drop your Matroska video file and the converter produces a universally compatible MP4 — playable on iPhone, Android, smart TVs, PlayStation, and every platform that doesn't support MKV. Audio and subtitle tracks preserved. No software required.
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We understand the importance of privacy, which is why we've developed a comprehensive privacy policy detailing how we handle your files and personal information. You can read the policy here.

 

MKV File

File extension .MKV
CategoryVideo File
DescriptionMKV is not a multimedia compression format, but rather a container format, which incorporates various types of multimedia. Mostly, such files contain audio, video, textual information (subtitles), etc. ñ elements, which may use completely different encoding patterns. MKVís biggest advantages are easy online sharing, low error rate, dissection of files into separate chapters, switchable subtitles, switchable audio- and video tracks, etc. Mostly, MKVs consist of open source elements, and they can be played in a vast number of players on nearly all existing platforms.
Associated programsVLC Media Player
Developed bySteve Lhomme
MIME typevideo/x-matroska
audio/x-matroska
Useful linksMore detailed information on MKV files
Conversion typeMKV to MP4

MP4 File

File extension .MP4
CategoryAudio File
DescriptionMP4 files can contain video and sound data. It is a file container that supports different multimedia content types such as multiple audio streams, subtitles, 2D and 3D image frames. MP4 is also used for streaming media services (online or digital TV). This file type supports the control of transmission speeds for media signal, as well as correcting corrupted frames. Thanks to comparatively low system requirements, MP4 is now the most popular container type for sharing media.
Associated programsApple QuickTime Player
Apple iTunes
Microsoft Windows Media Player
VideoLAN VLC Media Player
Developed byMoving Picture Experts Group
MIME type
Useful linksMore detailed information on MP4 files
5 star2026-01-25
My Samsung smart TV refused to play MKV files from my NAS. Converted the whole movie folder to MP4 and now everything streams perfectly without needing Plex or any extra app.
Kwame Asante
5 star2026-03-04
Needed to share a 2-hour MKV documentary via WhatsApp but it only accepts MP4. Converted it quickly and the file was accepted and played without issues on all devices in the group.
Natalya Bondarenko
5 star2026-04-18
Converted 50 MKV concert recordings to MP4 so I could upload them to our band's YouTube channel. The batch processing saved hours compared to doing them one by one.
Liam O'Sullivan

Rating MKV to MP4   5 star MKV to MP4   4.9 (3210 votes)
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Convert MKV to MP4 — Frequently Asked Questions ▼

Does converting MKV to MP4 reduce video quality?

It depends on the codec. If the MKV contains H.264 video and AAC audio — the most common combination — the streams can be remuxed into MP4 without re-encoding, preserving 100% of the quality. If the video uses a codec that is not MP4-compatible (such as HEVC/H.265 in some configurations), re-encoding is required and involves some quality loss.

Why won't my iPhone play MKV files?

iOS does not include a native MKV decoder. The iOS media framework only supports MP4, MOV, and M4V containers. Converting the MKV to MP4 (assuming H.264 video inside) makes it immediately playable in the Files app, Photos, and VLC without any additional apps.

Will subtitles be included in the MP4?

Subtitle handling depends on the subtitle format embedded in the MKV. SRT-style text subtitles are typically preserved. Image-based subtitle tracks (PGS, VOBSUB) may be dropped or require re-encoding. The online converter processes the main video and audio tracks; for complex multi-track subtitle handling, use Total Video Converter on the desktop.

Is there a file size limit?

The online converter accepts files up to 50 MB. Most MKV video files are larger than this — a 90-minute movie at 1080p is typically 4-15 GB. For large video files, use Total Video Converter on the desktop, which has no size limit.

Can I convert multiple MKV files at once?

The online tool processes one file at a time. For batch conversion of a media collection, use Total Video Converter (desktop): TotalVideoConverter.exe C:\mkv C:\mp4 /ConvertTo mp4 /ProcessRecursively.

What video codec does the output MP4 use?

The output MP4 uses H.264 video with AAC audio — the standard combination for maximum device compatibility. This codec combination plays on iOS, Android, Windows Media Player, VLC, YouTube, and every Smart TV.

What desktop tool should I use for large or batch MKV to MP4 conversions?

Total Video Converter handles large files, batch folder processing, and codec selection from the command line. It runs on Windows and supports automation via .bat scripts and Task Scheduler. Available at coolutils.com/TotalVideoConverter with a 30-day free trial.
 

 

Convert MKV to MP4 Online

Video editors and media enthusiasts convert MKV to MP4 to get a universally compatible container that plays on phones, smart TVs, and every streaming and editing platform.

What Is MKV?

MKV (Matroska Video) is an open container format that can hold virtually any combination of video, audio, and subtitle streams — including multiple audio tracks, chapter markers, and attachments. It is popular for archiving and high-quality video rips. The limitation is device support: MKV is not natively supported on iOS, many Smart TVs, WhatsApp, YouTube upload, or most video editing applications.

What Is MP4?

MP4 (MPEG-4 Part 14) is the standard video container for consumer distribution. It is supported natively by every major operating system, browser, mobile device, streaming platform, and video editor. MP4 with H.264 video and AAC audio is the lowest-common-denominator format for video sharing — if a device plays video, it plays MP4.

Online Converter vs Desktop Converter

FeatureOnline (this page)Total Video Converter (desktop)
Batch conversion✓ Single file✓ Entire folders, recursive
File size limitUp to 50 MBNo limit
Automation / scripting✗✓ Command-line, .bat, Task Scheduler
Files stay local✗✓ No upload required
PriceFreeFrom $29.90

Batch CLI example: TotalVideoConverter.exe C:\mkv_files C:\mp4_output /ConvertTo mp4 /ProcessRecursively

How to Convert MKV to MP4

  1. Click Choose File and select your .mkv file
  2. The format is detected automatically
  3. Select MP4 as the output format
  4. Click Convert — processing time depends on file size
  5. Click Download to save your MP4 file
  6. Play on your phone, upload to YouTube, or import into your video editor

When Do You Need MKV to MP4?

Convert from MKV

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

Convert to MP4

Using CoolUtils, it is possible to convert a variety of other formats to MP4 files:

                                                                                                 

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