To convert MKV to MP4 on a Mac for free, open VLC Media Player, choose File > Convert & Stream, add the MKV file, pick the H.264 + MP3 (MP4) profile and save. HandBrake also works, and FFmpeg can remux MKV to MP4 quickly without quality loss when the codecs are MP4-compatible.
Key Takeaways
- MKV and MP4 are containers; QuickTime Player on a Mac opens MP4 but not MKV.
- VLC and HandBrake convert MKV to MP4 on a Mac for free.
- An FFmpeg remux (stream copy) changes the container without re-encoding, so there is no quality loss.
- Zamzar’s free online tier is limited to 50 MB files as of October 2026.
- HitPaw Video Converter is now called HitPaw Univd and is paid software with a limited trial.
Convert MKV to mp4 mac
MKV (Matroska) is a popular video container format, and many content creators use it to store their content. MKV is a container, not a codec, so file size and resolution depend on the video codec inside it; MKV files are often large because they commonly hold high-resolution video plus several audio and subtitle tracks.
Many people find MKV videos hard to share because many devices and apps, including Apple’s QuickTime Player on the Mac, do not open MKV files natively. Large high-resolution files can also be a problem on phones with limited storage.
Converting MKV to MP4 solves most of these problems, because MP4 plays in QuickTime Player, on iPhone and iPad, and in most other players and devices.
This guide compares three video converters that convert MKV to MP4 on a Mac, then adds two more free methods: HandBrake and an FFmpeg remux that copies the video without re-encoding.
HitPaw Video Converter
HitPaw Video Converter converts video and audio files between formats. In January 2025 HitPaw renamed the product HitPaw Univd; it is paid software with a free trial.
Hence, if you’re looking to convert MKV files to MP4 on a Mac running macOS 10.13 or later (HitPaw’s published requirement), HitPaw Video Converter, now HitPaw Univd, can serve as an ”MKV to MP4 converter Mac”.
HitPaw says its converter preserves video quality during conversion. In practice, any converter that re-encodes video can lose a little quality; only a remux, which copies the existing streams into a new container, is truly lossless.
Besides converting your video files and audio files, HitPaw Video Converter is also pretty useful for editing your video. It means you can crop, trim, or perform different operations on the video.
Features
- It allows you to convert your video files in batches, meaning you can convert multiple files into different formats.
- Besides being easy to use, HitPaw Video Converter comes with a built-in-hotkeys.
- You can easily convert MKV to MP4 using HitPaw Video Converter.
- HitPaw says it supports more than 1,000 video, audio and image formats; no converter supports literally every format.
- HitPaw Video Converter comes with all basic editing functions.
- HitPaw advertised 24/7 customer support when this article was first written; check the current support options on HitPaw’s website.
Pros
- It supports Mac and Windows platforms.
- HitPaw’s product page lists 1,000+ supported formats as of October 2026 (this article originally cited 800+).
- HitPaw advertises up to 170x faster conversion with GPU hardware acceleration as of October 2026. This is the vendor’s own claim; real speed depends on your Mac and the file.
- HitPaw markets its conversion as lossless. The resolution stays the same unless you change it, but re-encoding can still reduce visual quality slightly.
- Earlier versions advertised downloading videos from 1000+ streaming websites; confirm the feature on HitPaw’s current product page, and note that downloading from streaming sites can breach their terms of service.
Cons
- The free trial converts only one-third of each file’s length; full use requires a paid license, listed from $19.95 as of October 2026.
VLC Media Player
VLC Media Player is a free, open-source media player from the non-profit VideoLAN project. The link above opens the Android app; the Mac version is a free download from VideoLAN’s official website. VLC can also work as a free ”MKV to MP4 converter VLC Mac”.
VLC Media Player is more than a player. It can transcode media files into other containers and codecs, including MP4 with H.264 or H.265 video.
On a Mac, the converter is under File > Convert & Stream (shown as Convert / Stream in some versions); step-by-step instructions are in the VLC section further down this page.
Features
- VLC Media Player is pretty good at creating video and audio effects.
- It helps you convert videos into different formats.
- You can also stream media over the internet.
- VLC can open some online streams by URL, but it is not a dedicated video downloader, and saving videos from streaming platforms can breach their terms of service.
- VLC Media also helps you to add a watermark to your video.
Pros
- It is free to use.
- VLC can help you convert a video into multiple formats.
Cons
- Sometimes, it becomes pretty hard to understand the interface.
ZAMZAR
You can use the ZAMZAR online converter if you don’t want to install an application. Zamzar runs in a web browser and says it handles over 1,100 conversion types.
Because it needs only a web browser, Zamzar’s free service can work for small files as a ”free MKV to MP4 converter MAC.”
Zamzar also converts audio files, documents and images. Uploading sends your file to Zamzar’s servers, so an offline tool is the better choice for private or confidential videos.
Features
- It comes with a pretty easy user interface as all you need to do is navigate to the ZAMZAR website and convert the file you’d like to.
- Using this tool, you can convert MKV to MP4 in three steps: upload the file, choose MP4, and start the conversion.
- Zamzar says it supports over 1,100 conversion types.
Pros
- It works fairly fast.
- You can convert your file by simply importing the video files from your PC gallery.
Cons
- The free service is limited to files of 50 MB as of October 2026, so most full-length MKV videos need a paid plan or an offline tool.
Who is best?
VLC Media is a reliable media player that offers you multiple opportunities. VLC converts videos into multiple formats for free, but its conversion settings are less obvious than those of a dedicated converter.
On the other hand, ZAMZAR is a nice tool as it doesn’t force you to install software on your PC. However, it possesses pretty restricted features, and it doesn’t allow you to convert lengthy videos.
Meanwhile, HitPaw Video Converter offers the most features of the three.
HitPaw converts high-resolution videos and uses hardware acceleration for speed, which suits people who convert often and are willing to pay. For occasional conversions, the free options (VLC, HandBrake or an FFmpeg remux) are usually enough.
How to Convert MKV to MP4 on a Mac with HitPaw Video Converter
Step 1: Import MKV file
Install HitPaw Video Converter and start the program to proceed ahead. Next, you’ll need to hit Add Video and import an MKV file you’d wish to convert into another format.
Step 2: Select Output
Step 3: Hit Convert
After selecting MP4 format, you’ll only need to select the ”Convert” icon to start converting your file. HitPaw then converts the MKV file to MP4 and saves it to the destination folder you chose.
Final Words
Choosing a tool to convert MKV to MP4 on a Mac comes down to file size, cost, privacy and whether the video needs to be re-encoded at all.
This guide covers both paid and free converters. HitPaw Video Converter (now HitPaw Univd) has the most features of the three tools reviewed, while free tools such as VLC and HandBrake handle most MKV to MP4 jobs.
HitPaw converts videos into other formats while keeping the original resolution; for a truly lossless result, use a remux when the MKV already contains MP4-compatible streams.
MKV vs MP4: What Is the Difference?
MKV and MP4 are both container formats: files that wrap video, audio and subtitle streams together. The container decides which devices can open the file, while the codec inside (such as H.264 or HEVC) decides the quality and file size.
| Feature | MKV (Matroska) | MP4 (MPEG-4 Part 14) |
|---|---|---|
| Type | Open, royalty-free container | ISO standard container (ISO/IEC 14496-14) |
| First released | December 2002 | 2001 |
| Tracks | Unlimited video, audio, picture and subtitle tracks | Video, audio, subtitles and still images |
| Common codecs | Almost any, including H.264, HEVC, AV1 | H.264, HEVC, AV1 video; AAC, MP3 audio |
| Plays in QuickTime on a Mac | No | Yes |
| File extension | .mkv (.mka audio, .mks subtitles) | .mp4 (.m4v, .m4a variants) |
Matroska was published as an IETF standard, RFC 9559, in October 2024. MP4 is directly based on Apple’s QuickTime File Format, which is one reason it works so smoothly on Apple devices.
How Do You Convert MKV to MP4 on a Mac for Free with VLC?
VLC Media Player converts MKV to MP4 on a Mac for free through its Convert & Stream window:
- Open VLC and choose File > Convert & Stream (Convert / Stream in some versions).
- Click Open Media and select the MKV file.
- In the profile menu, choose Video – H.264 + MP3 (MP4).
- Optionally click Customize and, under Encapsulation, confirm MP4/MOV is selected.
- Click Save as File, choose a folder and a file name ending in .mp4, then click Save.
Download VLC only from VideoLAN’s official website, and pick the Apple Silicon or Intel build that matches your Mac.
How to Convert MKV to MP4 with HandBrake
HandBrake is a free, open-source video transcoder for Windows, Mac and Linux, built by volunteers. It opens MKV files and can output MP4, MKV and WebM. According to HandBrake’s documentation, current versions support macOS 13 Ventura and newer, and the app has been a Universal Binary for Intel and Apple Silicon Macs since version 1.4.0.
- Click Open Source on the toolbar, or drag the MKV file onto the HandBrake window.
- Choose a preset, such as Fast 1080p30, or a device preset for Apple TV or another device.
- Check that the output format is MP4.
- Enter a file name in Save As and click Browse to choose a folder.
- Click Start to begin the conversion.
HandBrake always re-encodes the video, so it is ideal for shrinking large files but takes longer than a remux.
How to Remux MKV to MP4 Without Re-encoding (FFmpeg)
A remux moves the existing video and audio streams from the MKV container into an MP4 container without changing them. FFmpeg, a free command-line tool, does this with stream copy. According to the FFmpeg documentation, because stream copy involves no decoding or encoding, “it is very fast and there is no quality loss.”
After installing FFmpeg, open Terminal in the folder that holds your video and run:
ffmpeg -i input.mkv -c copy output.mp4
A remux works only when every stream uses a codec that MP4 accepts, such as H.264, HEVC or AV1 video and AAC or MP3 audio. If FFmpeg reports an error about a stream, that stream must be re-encoded with a tool such as HandBrake or left out.
Which MKV to MP4 Method Should You Use?
| Method | Cost (as of October 2026) | Re-encodes? | File size limit | Best for |
|---|---|---|---|---|
| HitPaw Univd (formerly HitPaw Video Converter) | Paid, from $19.95; trial converts 1/3 of each file | Yes | None stated | Frequent batch conversions with editing |
| VLC Media Player | Free, open source | Yes (with the default profile) | None stated | Occasional conversions |
| Zamzar | Free tier; paid plans for larger files | Yes | 50 MB on the free tier | Small clips without installing software |
| HandBrake | Free, open source | Yes | None stated | Compressing large files with presets |
| FFmpeg remux | Free, open source | No (stream copy) | None stated | Fast, lossless container change |
Common Mistakes When Converting MKV to MP4
- Re-encoding when a remux would do: if the MKV already holds H.264 or HEVC video with AAC audio, a remux keeps full quality and is much faster.
- Uploading private videos: online converters such as Zamzar process files on their servers.
- Assuming subtitles carry over: MKV files often hold several subtitle tracks, and not every converter keeps them; check the output before deleting the original.
- Installing from unofficial download sites: get VLC, HandBrake and FFmpeg from their official websites.
Once the file is converted, you may also want to crop the video for different screens, add or adjust subtitles or optimize the video for the web. If an MP4 will not open after conversion, see this guide on repairing corrupt MP4 videos.
Frequently Asked Questions
Can a Mac play MKV files without converting them?
Apple’s QuickTime Player does not open MKV files natively, but VLC Media Player, a free app from VideoLAN, plays MKV files on a Mac without conversion. Converting to MP4 is still useful for sharing the video or playing it on iPhone and iPad.
Does converting MKV to MP4 reduce quality?
Converting MKV to MP4 reduces quality only if the video is re-encoded. A remux with FFmpeg stream copy changes only the container, so there is no quality loss, while converters such as VLC, HandBrake and HitPaw re-encode and may lose a little detail.
What is the fastest way to convert MKV to MP4 on a Mac?
The fastest way is a remux with FFmpeg using the command ffmpeg -i input.mkv -c copy output.mp4, because no decoding or encoding takes place. It works when the MKV already contains MP4-compatible codecs such as H.264 video and AAC audio.
Is Zamzar safe for converting MKV to MP4?
Zamzar is an established online converter, but every file is uploaded to its servers, and the free tier accepts files only up to 50 MB as of October 2026. For large or private videos, an offline tool such as VLC or HandBrake is the better choice.
Is HitPaw Video Converter free?
HitPaw Video Converter, renamed HitPaw Univd in January 2025, is paid software. As of October 2026 the free trial converts one-third of each file’s length, and paid licenses are listed from $19.95.
