How to Change the Default Video Player on Mac (2026 Guide)

QuickTime handles MP4 and MOV files well, but it doesn't support MKV, VOB, HEVC 10-bit, or Blu-ray disc formats. For a lot of Mac users, that's the point where they start looking for a replacement. Installing a different player is straightforward, but files still open in QuickTime until you update the system default — and that setting is one level deeper than most people expect.

I walked through the steps on macOS Sequoia to confirm the process still works the same way it did in earlier versions. This guide covers two methods: reassigning a file format globally so it always opens in the new player, and opening a single file once without touching your system defaults. It also covers three players worth considering as replacements, depending on whether your priority is format coverage, native macOS feel, or disc and ISO playback.

Why QuickTime Falls Short for Some Workflows

QuickTime is capable for content Apple natively supports: MP4, MOV, M4V, H.264, and anything streaming through Safari. For everyday video playback, it works without extra setup.

The gaps appear at the edges. QuickTime doesn't open MKV files, which is the default container for a large share of downloaded and ripped video content. It also declines HEVC 10-bit encodes above a certain bitrate, AV1, TS recordings, and VOB files from DVD backups. It has no support for physical DVD or Blu-ray disc playback. Any of those formats returns a "The document could not be opened" error or a blank preview window.

For most people, there's a specific trigger: a movie that won't play, a batch of MKV files from a media server, or a disc collection with no software to read it. Knowing which format is causing the problem makes the choice of replacement player much shorter.

How to Change the Default Video Player on Mac

macOS does not have a single global "default video player" setting. Defaults are stored per file extension, so you update them one format at a time. Here are the three scenarios you are likely to need.

Change the Default for All Files of the Same Type

This is the standard method for reassigning an entire file format to a new player.

1. Find any video file of the format you want to reassign — for example, an MKV file.
2. Right-click the file and select Get Info.
3. In the Info panel, expand the Open With section by clicking the disclosure arrow.
4. Click the dropdown and select the player you want to use. If it does not appear, click Other to browse installed apps.
5. Click Change All at the bottom of the panel.
6. Click Continue when macOS asks you to confirm.

After this, every file with that extension opens in the player you chose. Different extensions are treated separately, so an MKV reassignment does not affect MP4 or MOV files. Repeat the process for each format you want to update.

Open a Single File Without Changing the Default

Use this when you want to play one file in a different player without touching your system-wide setting.

1. Right-click the file.
2. Hover over Open With in the context menu.
3. Select the player from the submenu.

This opens the file once in the selected app. Your existing default for that file type is not affected.

Revert to QuickTime Player as the Default

Follow the same steps as the first method. Open Get Info on any video file of the format you want to restore, choose QuickTime Player from the Open With dropdown, and click Change All. The setting takes effect immediately.

Video Players Worth Setting as Your Mac Default

The right replacement depends on what you're actually trying to play. MKV playback needs something different from Blu-ray disc support, and both differ from what someone looking for a native Mac experience would want. Here are three options that cover different ground.

DVDFab Player 6 Ultra for Mac

DVDFab Player 6 Ultra for Mac covers the formats QuickTime declines: MKV, HEVC (H.265), AVI, FLV, VOB, M2TS, and most other common containers, as well as 3D video in SBS, top-and-bottom, and Anaglyph formats. It also outputs lossless audio tracks that QuickTime doesn't pass through (Dolby Atmos, Dolby TrueHD, DTS-HD Master Audio, and DTS:X), so files with high-fidelity audio actually play as encoded. Beyond local video files, it extends to physical disc and ISO playback, which makes it a practical single default for mixed libraries that include both ripped files and Blu-ray disc backups.

What it does well:

• Plays MKV, HEVC, AVI, FLV, VOB, M2TS, and other formats QuickTime can't open
• 3D video playback in SBS, top-and-bottom, Anaglyph Red/Cyan, and HDMI 1.4 output modes
• Lossless audio output: Dolby Atmos, Dolby TrueHD, DTS-HD Master Audio, and DTS:X
• HDR10, HDR10+, and Dolby Vision rendering for compatible displays
• Plays region-coded DVD, Blu-ray, and 4K UHD Blu-ray discs and ISO files without a separate decoder
• Smart thumbnail preview bar for fast scene navigation in long files
• Compatible with macOS Sequoia (10.10 through 15.x)

Worth noting:

• Blu-ray navigation menu mode on Mac is still under development
• Physical disc playback requires a compatible external Blu-ray drive
• Internet connection required for software authorization and the movie library feature

VLC for Mac

VLC is an open-source player maintained by VideoLAN that opens an unusually wide range of formats without requiring codec packs. It handles MKV, AVI, HEVC, FLV, TS, VOB, and most containers that QuickTime declines. The interface does not follow macOS design conventions closely, but the format coverage and cross-platform availability (Windows, Linux, iOS, Android) make it a practical default for users who move video files across different devices or operating systems. VLC has been in active development for over 20 years.

What it does well:

• Opens MKV, AVI, FLV, TS, and VOB files without extra codecs or configuration
• Free with active development and regular security updates
• Available across macOS, Windows, Linux, iOS, and Android with consistent format support
• Built-in subtitle support for SRT, ASS, and embedded subtitle tracks
• Network stream playback via HTTP, RTSP, and local network shares

Worth noting:

• Interface design does not match macOS conventions; looks and feels like a cross-platform port
• No Blu-ray disc or 4K UHD Blu-ray playback support

IINA for Mac

IINA is a free, Mac-native open-source player built on the mpv engine. It was designed specifically for macOS: Touch Bar support, Force Touch scrubbing, Picture in Picture, and dark mode all work natively. Format coverage is solid for modern files including MKV, HEVC, AV1, and WebM, and playback quality on 4K files is smooth due to mpv's hardware decoding pipeline. Apple Silicon performance in particular benefits from mpv's low-overhead decode path. If you want a player that behaves like a native Mac app rather than a port, IINA is the closest option among free players.

What it does well:

• Native macOS design with Touch Bar, Force Touch scrubbing, and Picture-in-Picture support
• Handles MKV, HEVC, AV1, and WebM without additional codecs
• Efficient hardware decoding on Apple Silicon for smooth 4K playback
• Free and actively maintained on GitHub; no account or license needed

Worth noting:

• No DVD disc or Blu-ray disc playback of any kind
• Format coverage is narrower than VLC for older or less common containers (DivX, WMV, RealMedia)

Frequently Asked Questions

Conclusion

Setting a new default video player on Mac takes under two minutes once you know where the setting lives. The more relevant question is which player to install in the first place.

For MKV, HEVC, AV1, and most everyday video files that QuickTime declines, VLC or IINA covers those cases without a license fee. For Blu-ray disc collections, 4K UHD ISO files, or content with Dolby Atmos and HDR10 tracks, DVDFab Player 6 Ultra for Mac handles the formats that free players don't reach. Keep in mind that Blu-ray navigation menus on the Mac version are still under development, so disc playback currently works in Simple Mode.

Most users end up with two players: a free option as the default for common formats, and a dedicated player for disc or high-fidelity audio content. Use the Get Info method to assign each format to the right tool.