Quick Look plugins 
List of useful Quick Look plugins for developers
Install
Using Homebrew Cask
- Run
brew cask install <package>
Install all
brew cask install qlcolorcode qlstephen qlmarkdown quicklook-json qlimagesize suspicious-package quicklookase qlvideo
Catalina notes
To get plugins working in Catalina, you will need to remove the quarantine attribute.
Run this to see the attributes:
xattr -r ~/Library/QuickLook/
And run this to remove the attributes:
xattr -d -r com.apple.quarantine ~/Library/QuickLook/
Manually
- Click "download manually"
- Move the downloaded .qlgenerator file to
~/Library/QuickLook - Run
qlmanage -r
Plugins
QLColorCode
Preview source code files with syntax highlighting
Run brew cask install qlcolorcode or download manually
QLStephen
Preview plain text files without or with unknown file extension. Example: README, CHANGELOG, index.styl, etc.
Run brew cask install qlstephen or download manually
QLMarkdown
Preview Markdown files
Run brew cask install qlmarkdown or download manually
QuickLookJSON
Preview JSON files
Run brew cask install quicklook-json or download manually
BetterZipQL
Preview archives
Note: The BetterZipQL plugin was integrated with the BetterZip app.
Run brew cask install betterzip to install the BetterZip app and its Quick Look plugin or download manually
The legacy BetterZipQL plugin can be downloaded here.
qlImageSize
Display image size and resolution
Run brew cask install qlimagesize or download manually
Suspicious Package
Preview the contents of a standard Apple installer package
Run brew cask install suspicious-package or download manually
QuickLookASE
Preview Adobe ASE Color Swatches generated with Adobe Photoshop, Adobe Illustrator, Adobe Color CC, Spectrum, COLOURlovers, Prisma, among many others.
Run brew cask install quicklookase or download manually
QLVideo
Preview most types of video files, as well as their thumbnails, cover art and metadata
Run brew cask install qlvideo or download manually
More
These are not included in Install all.
ProvisionQL
Preview iOS / macOS app and provision information
Run brew cask install provisionql or download manually
QuickLookAPK
Preview Android APK files
Run brew cask install quicklookapk or download manually
quicklook-pat
Preview Adobe Photoshop pattern files
Run brew cask install quicklook-pat or download manually
WebP
Preview WebP images
NOTE: this is already covered by
qlImageSize, so this plugin is listed here only in case you do not likeqlImageSize
Run brew cask install webpquicklook or download manually
License
To the extent possible under law, Sindre Sorhus has waived all copyright and related or neighboring rights to this work.