WebM Quick Look Preview extension

The original free macOS plugin to play .webm movies in Quick Look Preview, with no finder panel or background play inconveniences.

Updated to version 2.5 - November 12th 2025

New Version 2.5 Download from Releases. - WebM QuickLook 2.5: AV1, Big Sur, PiP, Thumbnails/icons

Install

Launch the app once. This registers the extension as the extension itself stays within the app bundle.

Uninstall

Delete the app.

Update

Replace the older app with the newer app. MacOS looks for the extension in the app: if app is moved, a relaunch might be needed. Best to keep in Macintosh HD/Applications.

Direct download (2.5 Universal Binary)

Tip

opt + space quicklooks in full-screen

Features

• Behave as it should when the preview is in the Finder panel/Gallery, the background, or in Quick Look.
• Optional thumbnails/icons.
• Fine-tunable controls and gestures/scrolling.
• Picture-in-Picture that floats above Spotlight/Dock/Menu-bar.
• A-B looping and custom bookmarks.
• Properly pauses and resumes like native formats.
• Supports every .webm including AV1.
• Has low requirements (From macOS 26 Tahoe down to Big Sur 11), Intel and M-series.
• Ultra-lightweight, and doesn't run in the background.

Once the app is launched, the WebM Quicklook extension appears in Extensions from General in macOS' System Settings, and disapears if app is deleted.

Notarized and gatekeeper-approved, Universal Binary for Silicon and Intel architectures, with low osX requirement (Big Sur), up to latest Tahoe.

Parametrized.

Check out QLCodec! QuickLook play everything! Repository.

Acknowledgment

FFmpeg for their libraries licenced in LGPLv2.1. We use, or have used, code from FFmpeg in ths project, a project which wouldn't have been possible without them. QLCodec is forever grateful for FFmpeg's selfless commitment of sharing knowledge with everyone.

VideoLan for their libraries licenced in LGPLv2.1. We use, or have used, code from Videolan's VLCKit in ths project, a project which wouldn't have been possible without them. QLCodec is forever grateful for Videolan's selfless commitment of sharing knowledge with everyone.

Perian for their Quicktime plug-in back-in-the-days. Perian was an open-source QuickTime component that enabled Apple Inc.'s QuickTime to play several popular video formats not supported natively by QuickTime (quote from Wikipedia).

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