10 Best MKV to MP4 Converters for Windows/macOS & Online [2023]

In this condition, you need to convert MKV to a more compatible video format, like MP4. Here we’d like to show you top 10 ways to convert .MKV to MP4 for free without quality loss.

MKV, also known as Matroska, is a container to store multiple video, audio, subtitle tracks in a variey of codecs, such as HEVC, H.264, DTS, Dolby Digital audio, or SRT etc. It is a universal format that used for storing common multimedia content, like movies or TV shows in high quality. For example, you can get some .MKV files from online downloads, Blu-ray or DVD rips from MakeMKV. However, MKV is not powerful enough to replace all the other formats owing to its poor comaptibility. Many mobile devices and programs refuse to open or recognize MKV video files.

WinX Video Converter is one of the best MKV to MP4 converters that allows you to change MKV container to MP4 format with or without re-encoding. With 370+ built-in codec, you’re able to convert MKV files to MP4, MOV, AVI, HEVC, VP9, iPhone, Android mobiles, QuickTime, and 420+ profiles. The “Auto Copy” mode also lets you convert MKV to MP4 without changing the underlying codec, fast and ZERO quality loss!

Part 1. How to Convert MKV to MP4 on Windows & Mac

Obviously, converting MKV file to MP4 is imminent based on the above reasons. The only problem is how to convert MKV to MP4. If this is what’s borthering you, you’ve come the right place. Here top MP4 converters are shared to help you transcode MKV video format to MP4 easily and free.

When it comes to convert .MKV to .MP4 on Windows and macOS, there are a great many programs available for your choice. Here we have listed several programs of the top rank. Just pick out the best fit one transcode MKV to MP4 easily and free.

#1. WinX Video Converter

A full-featured solution for batch MKV to MP4 conversion.

WinX Video Converter should be at the top of your priority list as it can convert MKV to MP4 with or without re-encoding. Actually, it supports to transcode any videos to 420+ preset profiles, including MP4, MOV, FLV, HEVC, H.264, iPhone iPad, Android, HDTV, Xbox, PS5 and more. And you can compress MKV videos smaller up to 90% file size reduction without losing quality visually. Also, it makes full use of CPU and GPU, boosting video conversion speed to 47x real-time faster on computers configured with both QSV-allowed Intel processor (2-6th generation) and CUDA/NVENC-enabled NVIDIA GPU.

Pros:

• Wide support of audio/video codec and format, including HEVC, AV1, VP9, DTS, MP3, MP4, MKV, MOV, WMV, and more.
• Achieve a balance among video size, output quality and converting speed.

Cons:

• Limited features for unregistered version.

How to Convert .MKV to MP4 on Windows 11/10/8/7 and macOS Quickly within 3 Steps

After downloading and installing mkv to mp4 for Windows or Mac, you only need 3 simple steps for batch MKV to MP4 conversion.

Free Download WinX Video Converter for Windows 11/10/8/7
Free Download WinX Video Converter for macOS Ventura and lower

Step 1. Load target MKV files.

Open the program and load the source MKV file: Click + Video button, and then browse and open target items. If you need to transcode multiple MKV files, simply choose all of them for batch video conversion. It will save you much time and energy.

Step 2. Select MP4 in output profile.

After loaded, an Output Profile panel will pop up automatically. In this screen, you will find many preset MP4 output profiles. Choose one based on your own needs. Here let’s select MP4 Video (codec: H.264+ AAC) under General Profiles category for a balance of quality and size.

Optional: Tick “Auto Copy” on the lower right corner of the home screen if your input MKV is encoded by H264 or H265 codec and you wanna keep the codec. In this mode, the .mkv to mp4 conversion will be done without decoding or re-encoding. It simply copies all media data from MKV to MP4 container format, thus the converting speed will be expedited up to 10X faster than transcoding.

Of course, you can customize your output video before converting. Here are some tips for you:

• Tweak video/audio parameters: Click Setting button, here you can compress 4K MKV to 1080p/720p, change frame rate, bitrate etc.
• Select the target track or disable unwanted tracks: On the main interface, click on the drop-down list of video, audio or subtitle to select your target video/audio/subtitle track or disable multitracks at all.
• Enhance video quality: Go Output profile window, move the slider to HQ/Slow, which will make slow down the converting speed slightly yet with higher quality. Meanwhile, you’re always suggested to tick on the box of Use High Quality Engine.
• Edit MKV files: merge several segments into one, trim/cut video, crop video, add external subtitles, adjust audio volume

Step 3. Get It Started Now.

Before any further, you can change the destination folder. By default, output files will be stored in C:\Users\admin\Videos\WinXVideos\. Choose another one by clicking Browse button if you like.

Once in place, just click RUN button – a blue round one – to start the conversion instantly. After then, you’re able to play output MP4 video on desktop, HDTVs, PS4, Xbox, Plex, mobiles and more. Note: WinX HD Video Converter Deluxe supports more than 370+ video/audio codecs, that means it can not only convert MKV to MP4, but also convert WebM to MP4, HEVC to H.264, AVI to WMV, AVI to MP4, MP4 to MP3, etc without a hassle.

Video Tutorial: How to Convert MKV to MP4 without Losing Quality

#2. Freemake Video Converter

Best fit for free converting MKV to MP4 for Windows users.

Freemake Video Converter has been a sought-after free video converter for Windows for over 10 years. What makes it unique are the sceurity, reliable converting process and wide video formats support, certainly including converting MKV to MP4 on Windows 10/11. Moreover, it allows users to convert DVD disc, create photo slideshow, edit videos and so on. The bad thing for Freemake is that the output video is usually stamped with annoying watermark.

Pros:

• Compatible with many input and output formats, supporting up to 4K UHD.
• Merge video files and import subtitles.

Cons:

• Only available on Windows platform, including Windows 11/10/8/7.
• No support for AV1 codec.
• Videos processed by free version will be stampted with Freemake watermark.

How to change MKV container to MP4 on Windows 11/10/8/7 with Freemake Video Converter

Step 1. Free download the program and launch it on your computer. Click “+ Video” button to import your target MKV video files.

Step 2. Choose “to MP4” as the output format from the output format bar at the bottom of the interface.

Step 3. Click “Convert” to change MKV file to MP4 on Windows PCs.

#3. VLC Media Player

The simplest MKV to MP4 solution for Windows & macOS users.

You may be familar with VLC as a free and popular multimedia player that supports video playback of many formats. Can VLC convert MKV to MP4? Certainly yes. VLC can also be used as a video converter to changing video format, including MKV to MP4. Though it may be not as powerful as professional video converters, it fully meets the common video format conversion needs on Windows and Mac if you don’t want to install any extra software on your computer.

Pros:

• Easy to use, free and available on cross-platforms.
• No need to download any other third-party video converter if you’ve installed VLC media player.
• Update constantly to support the latest codec such as AVI, H.265 etc.

Cons:

• Limited video output support.
• Conversion isn’t speedy. Can’t merge video clips.

Step-by-step guide to convert MKV files to MP4 via VLC

Step 1. Open up VLC on your computer (take Windows 10 PC as an example), and click Media on the toolbar and select Convert / Save to enter a new Open Media window.

Step 2. Click Add button to browse and import your target MKV video. It supports to import several videos at once. Then click Convert / Save button.

Step 3. Choose Video – H.264 + MP3 (MP4) as the output format. If you’d like to convert MKV to other formats or devices, you can click the drop-down list to select your desired one. You’re able to cutomize video details like video / audio codec, subtitles through Edit selected profile button besides the drop-down list.

Step 4. Click Browse to specify the destination path for the output video.

Step 5. When you’re done, click Start button to comvert MKV to MP4

#4. HandBrake

An open-source video converter for transcoding MKV to MP4.

HandBrake is another MKV converter that allows you to convert videos to MKV or MP4, embedded in H.264, HEVC, MPEG-2, MPEG-4, Theora, VP8 and VP9. Also, HandBrake empowers users to use third-party libraries such as x265, FFmpeg, and libvpx to convert videos. If you want to adjust video parameters like resolution, frame rate, bit rate, aspect ratio or simply edit videos, HandBrake can do it all. However, it’s criticized for making files bigger after MKV to MP4 conversion, getting subtitle messed, and running really slow even on a new fast core CPU with large RAM. Anyway, as a free and open-source video converter, HandBrake is still a nice option for MKV to MP4 conversion.

Pros:

• Free, even the novice can use it without learning curve.
• Both able to convert videos and DVD discs.

Cons:

• Only support to convert video to MKV and MP4.
• Slow conversion speed while converting 4K footage.

Tutorial on how to convert from MKV to MP4 via HandBrake

Step 1. Download HandBrake from it’s official site, and launch it.

Step 2. Click Open Source or simply drag and drop to import your target MKV files.

Step 3. Choose MP4 as the output format below the Summary column.

Step 4. Tweak the video setting if necessary. You’re able to adjust video dimensions, resolution, frame rate, codec, quality, audio, subtitles, deinterlace, denoise, sharpen video and crop, rotate, flip video etc.

Step 5. Click Browse button to choose a destination folder for the output video.

Step 6. Tap Start Encode and wait. The MKV to MP4 conversion will be activated and finished soon.

#5. FFmpeg

Best fit for those who knows something about commands.

FFmpeg is a free and open-source software project that based on command lines. It offers a complete, cross-platform solution to record, convert and stream audio and video, including MKV to MP4. But for novices, FFmpeg can be hard to use. Kowning the basic command lines could help a lot. To convert MKV to MP4, the basic command line is “ffmpeg -i input.mkv output.mp4“. Here is the detailed explation of this command line:

• ffmpeg: a necessary part to tell the OS who is using the command line.
• -i: the abbreviation of input, means the following file is the original file to be converted.
• input.mkv: the file that is to be converted. You can input two files at once through “ffmpeg -i input1.mkv input2.mkv”.
• output.mp4: The output file is in MP4 container.

Pros:

• Excellent codec and filter support 
• Support a large number of encoders and decoders 
• Provide video streaming and web hosting capabilities

Cons:

• It’s not easy for beginners to use and implement.
• The official documentation is not clear and can be quite confusing.

[With command lines] MKV to MP4 FFmpeg tutorial

Step 1. Download FFmpeg from its official site – https://ffmpeg.org/download.html. Then configure FFmpeg on your computer.

Step 2. Press Win + R and input cmd to enter the DOS window.

Step 3. Input cd test video. Now I’m in the location where store the MKV video.

Step 4. Input FFmpeg command line: ffmpeg -i spreed.mkv -c:a copy -x265 -params crf=25 spreed1.mp4

• -c:a copy means keeping all the copies of audio streams.
• x265 params: Passing options are passed to x265 with the -x265-params argument.
• crf=25 refers to encode video in a not bad quality. (CRF, the abbreviation of Constant Rare Factor. The CRF scale is 0-51, where 0 is lossless, 23 is the default, and 51 is worst quality possible.)

Step 5. Press Enter on the keyboard. Then, you’ll get the desired .mp4 file.

Of course, there are many other FFmpeg codecs, for example, to map ALL streams, namely remuxing MKV to MP4, you need type in the command line: ffmpeg -i spreed.mkv -map 0 spreed1.mp4. Know more about FFmpeg codecs >>

#6. remux

Best for macOS users to convert media files into popular formats.

remux is straightforword MKV to MP4 converter on Mac based on FFmpeg tool. This means users can enjoy ffmpeg ability for encoding MKV, MP4, M4V, AVI, TS, or VOB media files, but get rid of arcane command lines. This Mac MKV to MP4 converter is available on OS X 10.8.0 or later. It allows you to change container without re-encoding, such as MKV to MP4, MP4 to MOV, TS to WMV etc., select, rearrange, and duplicate tracks. and convert DTS to AAC/AC3 for Apple TV, PS5 etc. Also, batch processing on remux is available to reduce the conversion time.

Pros:

• Based on FFmpeg, it’s able to quickly create MKV, MP4, M4V, AVI, TS, HEVC or VOB media files.
• Change container without re-encoding.

Cons:

• Only available on macOS.

Here we go for easy steps to convert .MKV to MP4 with remux

Step 1. Open up the remux.app on your Mac computer. It works on OS X10.8.0 or later.

Step 2. Open the video file you want to remux to another format by clicking ‘Files’ >’Open’ on the toolbar.

Step 3. Select the desired new container format from the popup button in left upper coner of the window.

Step 4. Select the filename via ‘Save as’ button. And tap ‘Go’ icon to start the .mkv to .mp4 remux process.