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How to play MKV on Mac?
How to play MKV on Mac?
  • Oka Assist
  • 2026-02-13 11:52:47


How to play MKV on Mac?

For the new Mac users, you might have below questions: Can you play MKV on Mac? How do I convert MKV files on Mac? How can I play MKV files on Mac QuickTime? What Mac apps can play MKV? What is the best MKV video player on Mac? Can VLC convert MKV to MP4?

You can get the answer to all of these questions in the article below. MKV is commonly used for playing high-quality HD 720p or 1080p movies and videos. However, by default, Mac OS doesn't support MKV file format and its codecs.

QuickTime can play mkv after you install Perian Plugin.

Perian, a QuickTime plugin, can help play MKV video files on your Mac. And it is an open-source plugin for QuickTime. After installation, you can open MKV files in QuickTime.

The only limitation is Perian only supports a specific version of QuickTime, like 7.6.6.

The best 3rd party Media Player on Mac

Plenty of great video players on Mac; they are the best alternative media player to QuickTime. Here is a few of them. You can also read The Best 6 Video Players for Mac to find the one suitable for you.

  • Omniplayer is the most stable video player. It supports all video/audio formats and local streaming to the TV. You can mirror your video to your TV to watch it on a big screen. And other features like video/audio equalizer, subtitle auto-download, and picture-in-picture feature. Even the video recording to gif. This is the best of the best.

  • VLC is the most famous video player in the world. Although the UI is very old-fashioned, the user experience is strange, but it is the most stable video player for all platforms, whether for Windows/Mac or Android/iOS.

  • IINA, The modern media player for macOS, IINA is born to be a modern macOS application, from its framework to the user interface. It adopts the post-Yosemite design language of macOS and keeps the pace of new technologies like Force Touch, Touch Bar, and Picture-in-Picture. This is the description in the home of IINA, so you know this is an open-source tool to give a different experience on Mac.

  • Other tools like MPlayerX, Elmedia Player, 5K Player, XBMC Player, etc. You all can find the package on the internet and have a try; it is almost the same as Omniplayer and IINA.

Video Converter converts the MKV to MP4, MOV, M4V, or any other format.

This is the alternative way to play MKV files. As we all know, QuickTime Player supports MP4 & MOV. You can use OmniConverter to convert the MKV files, and OmniConvert provides a default template for you to convert to any device's default format, like iPhone, iPad, or Mac. You do not need to figure out the detailed settings; choose what kind of device you want to play this media file, then you will set everything for yourself.

Conclusion

There are already plenty of solutions for you. Maybe five years ago, there was no qualified media player on Mac AppStore. Still, in 2021, all the apps in this article can play the MKV files without any issue on Mac.


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Commonly Tried but Ineffective Solutions Users typically attempt the following methods, most of which fail to solve the problem at its root: Manually deleting directories such as ~/Library/Caches and ~/Library/Logs Using third-party cleaning tools like CleanMyMac or similar utilities Uninstalling and reinstalling Keynote Reinstalling macOS via “Reinstall macOS” These approaches are limited because they do not address the real sources behind System Data inflation. III. What Exactly Is “System Data”? It is important to understand that: System Data is not a real folder, but rather a collection of data that macOS cannot accurately categorize. System Data may include, but is not limited to: macOS system temporary files Application and system caches Portions of the user Library (~/Library) Files Spotlight cannot classify Large resource files inside application packages Local caches from cloud services (such as iCloud or OneDrive) iPhone / iPad backup files Residual data from deleted user accounts Time Machine local snapshots As a result, System Data cannot be reliably inspected or reduced through simple cache deletion or Finder-based browsing. IV. Key Cause #1: Time Machine Local Snapshots Consuming Disk Space How Local Snapshots Work Even when no external drive or NAS is connected, macOS will: https://cdn.okaapps.com/resource/图3.webp Create a Time Machine local snapshot every hour Retain snapshots from the last 24 hours by default If the backup destination remains disconnected, keep local snapshots associated with the most recent full backup These snapshots: Are based on the APFS file system Do not appear as regular files Are entirely counted under System Data In some cases, local snapshots can consume tens or even hundreds of gigabytes. https://cdn.okaapps.com/resource/图4.webp Why They Sometimes Cannot Be Deleted When Time Machine uses a NAS or network storage device as its backup destination, the following situations may occur: The NAS was previously disconnected The network path or IP address changed The backup was not re-“claimed” by the system As a result, macOS may treat these snapshots as belonging to an unreachable backup destination, leading to: tmutil deletion failures Errors such as Stale NFS file handle Snapshots that cannot be reclaimed, causing persistent disk usage V. Key Cause #2: How Keynote and Similar Apps Amplify System Data Keynote itself is not malfunctioning, but its design inherently amplifies System Data usage: Keynote files are actually packages containing large numbers of resources These may include: High-resolution images Embedded videos Fonts Animation and transition assets Spotlight sometimes fails to correctly classify these resources, causing them to be grouped under System Data. For users who frequently create large, media-heavy presentations, steady growth in System Data over time is expected. VI. 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Long-Term Prevention Tips (for Keynote and Content Creators) Archive older Keynote projects to an external drive or NAS Avoid storing large volumes of presentation files locally for long periods Keep the Time Machine backup destination consistently available Avoid third-party tools that perform automated “system-level cleaning” Periodically monitor disk usage with analysis tools VIII. Conclusion Abnormally large macOS System Data usage is rarely caused by a single cache or log issue. Instead, it is typically the result of Time Machine local snapshots, application package resources, and inherited historical data structures working together. Only by understanding what System Data actually contains—and addressing the root causes—can disk space issues be resolved effectively and long-term.