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How to Convert MKV to MP4 on Mac Fast and Losslessly

It happens to all of us. There is a MKV file you wanna watch on your MacBook or iMac. You click on it, trying to open with default player QuickTime, but end up with an error message "There is no application set to open mkv" or mkv no sound in QuickTime even if you opened it. Similar case, when you play MKV on game consoles, your MKV video is still unplayable. What's worse, you transfer MKV videos to iPhone iPad to watch on the trip, but iTunes tells you the MKV file is incompatible with your device. In other cases, when uploading MKV files to YouTube or Facebook, you encounter a heavy Waterloo, again.

Why could these be? Mainly because MKV is incompatible with majority of the modern mobile devices and platforms, alongside with its comparatively large file size. To make MKV playable on most devices and platforms, you need to convert MKV to MP4 since MP4, also a container format, keeps quite a good balance between high quality and file size. And more importantly, it's compatible with almost all the players, devices and platforms. So first things first, you need a MKV video converter that has good peformance in 2019.

To Convert MKV to MP4 on Mac (incl. Catalina) with Better Compatibility

Convert MKV to MP4

MacX Video Converter Pro is your best mate. It is a totally free yet 100% clean video transcoder, letting you freely decode and encode MKV videos to MP4, MOV, H.264, HEVC, and any other video and audio formats at the highest performance.

Free Download MacX Video Converter Pro to Convert MKV to MP4 without Quality Loss!

How to Convert MKV to MP4 on Mac OS X Mountain Lion or Higher

MacX Video Converter Pro supports converting 4K and HD 1080P MKV videos to MP4, MOV, AVI, FLV, and 370+ others. It has various editing features available for you to trim, cut, crop, rotate, add subtitles, add effects, and do more. The support of unique Intel QSV/Nvidia/AMD hardware acceleration, built-in hyper-threading tech and Multi-core CPU utility ensures the fastest speed to convert videos into H.264 or H.265 MP4 video. Additionally, the built-in advanced High Quality Engine alongside with the Auto Copy feature ensures the highest possible quality for MKV to MP4 conversion task. Now follow the steps below and learn how to encode MKV videos to MP4 on your Macbook or iMac.

Step 1: Import MKV file by clicking "Add File".

Free download the MKV to MP4 converter on Mac, or your Windows PCs ( MacX HD Video Converter Pro for Windows). Then click "Add File" button to load the MKV files. You can load multiple MKV videos as it supports batch conversioin. First, select the video track, audio and subtitle you want to keep in the output MP4 file by click the up and down arrow icon behind the source video. You can select multiple audio tracks and subtitle tracks at the same time.

Step 2: Choose the Output Video Format.

After the input MKV video importing, you can see video formats options at the bottom of the window. It allows to freely convert MOV to MP4, WMV/WebM to MP4, MKV to H.264, and even transcode MP4 to MP3, MOV, MKV, and more like a piece of cake. Select MP4 format in HEVC, H.264, MPEG4 as you like, or simply choose preset profiles of iPhone iPad Android.

Best MKV to MP4 converter for Mac)

Step 3: Edit MKV Video (Optional).

Meanwhile, you can also see some icons of editing like cut, crop, subtitle, effect, rotate below the video information. If you need to cut off certain parts from MKV video, free set up video Start Time and End Time, add fans made funny subtitled to MKV or rotate MKV video 90 or 180 degrees, you can click the corresponding icon to edit MKV video before conversion.

Step 4: Start to Convert MKV to MP4 on Mac.

Hit Folder button to select a destination folder. Followed by a click on "RUN" button, which gives an order to this top video processing tool for Mac to begin to transcode MKV video to MP4 on macOS. Only seconds and you will get the output MP4 files with lossless quality (High Quality Engine tech built-in).

Step 5: Time for MKV to iPhone Transfer. (Optional)

This is not a must-have step, but the one for those who gonna transfer MKV video from Mac to iPhone. You can just use iTunes or free download and launch MacX MediaTrans, if you are annoyed by iTunes complex process, and then enter its "Video" section to "Add Video" from Mac to this video transfer app. Afterwards, give a hit to "Sync" button and then the MKV videos are transferred to your iOS iPhone iPad iPod within seconds only.

Solution 2: Handbrake

Handbrake is a famous converter for both MKV and MP4. It supports macOS 10.7 and later. The free MKV converter remains popular mainly for its fast speed and good output quality in 2019. Plus, it has some advanced features to let users adjust the bit rate, resolutions, video codecs, quality, other video parameters, add subtitles etc. It will also convert videos to various ready presets for mobiles directly. Therefore, it's another good choice when you need to convert videos from MKV to MP4 on Mac computers.

Step 1: Download Handbrake from it's official site. Then launch the program downloaded on Mac and click Source > Open File to load the MKV file. You can also select all your MKV files into Handbrake.

Step 2: Select MP4 in the Output Setting. Then customize the video settings if necessary.

Step 3: In the destination section, set an output folder. Then click Start on the top bar to begin MKV to MP4 conversion process.

Handbrake convert MKV to MP4

See Also: Encounter Errors While Converting MKV to MP4 with Handbrake? Here's How to Fix It >>

MKV to MP4 Conversion Test: MacX Video Converter Pro vs Handbrake

You get the detailed steps to convert MKV to MP4 on Mac with 2019 top free video converter from MacXDVD. Yet, some of you might be curious about the specific conversion datas: how long it will take? any loss on output MP4 video quality? would output file size be smaller? any crashes?...

To answer your guys questions, we compare MacX Video Converter Pro with Handbrake to let you clearly see the differences. Let data do the work. Afterwards, I guess you can make a decision to download free MKV video converter or not.

Input MKV (AVC) Video

MacX Video Converter Pro
Output MP4 (H.264) Video

Handbrake
Output MP4 (H.264) Video

Length: 3 mins 54 seconds

the same

the same

Resolution: 1280x720

the same

the same

Video Bit rate: 2500 kbps

2741 kbps

2817 kbps

Frame Rate: 23 fps

the same

the same

Audio Bit rate: 192 kbps

the same

the same

Channels: 2

the same

the same

Audio sample rate: 44 KHz

the same

the same

File Size: 89.4 MB

66.3 MB

78.7 MB

Conversion Time

38.64 seconds

54.91 seconds

Output Video Quality

Excellent

Excellent

From the above table, we can see there is no big gap between these two free MKV converters for 2019. In general, MacX Video Converter Pro performs better than Handbrake in video converting speed and video compressing side. Certainly, it's just a single test. You can still download both free MKV to MP4 converter to have a test if you have spare time. This comparison table just provides you with a reference.

[Update] FAQ on MKV to MP4 Conversion on Mac

Q1: I want to convert mkv to mp4 without re-encoding to keep the same file size and video quality. I need a program that allows me to just drag my 720P MKV video file onto, set it to mp4 and get the file with no quality loss. Any help?

A1: If the video streams in the MKV file are in an mp4 compatible codec like H.264, then you can move content from mkv to mp4 intactly by simply changing the format. In MacX Video Converter Pro, the Auto Copy box on the right lower interface is designed for that job. There are many other demuxers on the market for the same task. An extra benefit is that it can copy a large high-definite MKV to MP4 few hundred times faster than re-encoding.

Q2: I have a MKV file with subtitle muxed, now i want to convert it to mp4 without losing the subtitle. I already tried the other softwares like Handbrake, rebox.NET and VLC to convert it but the subtitles didn't carry over.

A2: It will depend on the type of subtitles. You should note that MP4 supports less types of subs than MKV. If the subtitle is in XSUB, SAMI, MPSub, SubRip or others, you can't pass-through the subtitle into MP4. To keep the subtitles, you can either: 1; extract the subtitles out of MKV and convert them to .srt format. 2; go to handbrake, select subtitles tab, select the subtitle track and then burn in the subtitle. With MacX Video Converter Pro, it will pass-through supported subtitles from MKV to MP4 as soft subtitles, and automatically burn in subtitles to MP4 when it's not supported. Not o mention that this program can extract subtitles and save them in .srt format in one stop.

Q3: I'm trying to convert an MKV container to MP4/M4V with the existing video and audio codecs (HEVC x265 and AAC audio). I used the "Convert/Stream" function and selected the "keep original video track" and "keep original audio track" checkboxes. But the M4V output file contains only the audio track; the video is missing. If I use the "Streaming/Exporting Wizard" instead of the "Convert/Stream", the MP4 output option is greyed out and can't be selected unless I enable transcoding to 264 (which I don't want to do). Any ideas? Running VLC 2.2.1 on OS X El Capitan.Thanks!

A3: The highest possible reason why you fail to convert MKV to MP4 on Mac with HEVC x265 is that x264 works fine in MP4 file container while x265 is not supported in an MP4 container, at least not in VLC. So if you insist on transcoding MKV to HEVC x265, you're suggested to ditch away VLC player, instead using MacX Video Converter Pro to decode MKV to HEVC x265.

convert MKV to HEVC

Q4: I have a lot of HD MKV files that I wish to convert for iTunes. I want a converter, but need to keep the same good quality!! (the videos/movies are 720 and 1080p) Any suggestions please? OS X or Windows, I can use both. Linux too if it crops up..Thanks - Vortar from mac-forums

A4: You see, iTunes supports video formats including MP4, MOV, M4V, limited types. If you're itching to convert MKV to iTunes, one way is to change MKV format to MP4 iTunes acceptable format. Another better way is to directly convert MKV codec to iTunes profile, with iTunes best parameter settings. In case you are a layman and don't know much about iTunes suitable video parameter settings, you'd better resort to the MKV to iTunes conversion with most ideal profile offered.

Q5: Hi anyone know who is best .mkv to .mp4 video converter with high quality video and audio and low Mb size so if its possible. Now I'm using Handbake to convert a 4K MKV file but it takes much mb size (10 mins for 1.5GB). Which will give me the smallest output size with best possible quality?

A5: First of all, you should know that file size = bitrate * running time, and bit rate will influence the video quality. If you don't nitpick the video quality, lower the bitrate and resolution to one level below will result in smaller size with acceptable quality. Beyond that, editing features like cropping and trimming will also help. Put aside the objective factors, software design will lead to difference in output size. MacX Video Converter Pro has a unique compression engine which will be worth your try.

ABOUT THE AUTHOR

Kaley Torres

Kaley Torres is particularly skilled in writing and sharing video-related contents. Her guides cover from deep-seated video/audio parameters, to media entertainment on different platforms. She also enjoys shooting and processing videos by herself for a more reliable basis of informative info with her articles.

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