QLFits3
QLFits3 is a QuickLook generator plugin for macOS that enables preview of FITS (Flexible Image Transport System) astronomical image files directly in Finder, Mail and other macOS applications. FITS is the standard image format used by professional and amateur astronomers for observational data and scientific imagery. QLFits3 lets users inspect FITS file contents, view embedded metadata and image statistics without needing to open a full application. The plugin is developed by Onekiloparsec and integrates into macOS's QuickLook system.
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1 suggestionQLFits3 is a QuickLook generator plugin that extends macOS's QuickLook system and cannot be updated independently. It is not updated through the App Store or a separate vendor installer — instead, you must obtain and install the plugin directly from Onekiloparsec's website or repository, which will register it with the system-wide QuickLook service. Check onekiloparsec.org or search for "QLFits3" to find the current build; be sure to download a native (Apple Silicon / arm64) version if you are running an M-series Mac, as the Intel-only build will stop working entirely when Apple removes Rosetta 2 in macOS 28 (September 2028). After downloading, place the plugin in ~/Library/QuickLook/ or /Library/QuickLook/ (both locations are valid) and restart Finder (or use qlmanage -r to refresh the QuickLook cache immediately). If Onekiloparsec has not yet published a native Apple Silicon build, contact the developer to confirm whether one is planned before the Rosetta 2 removal deadline in September 2028.
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