QLFits for Mac

Quick summary

QLFits is a Quick Look plugin for macOS that lets you preview FITS (Flexible Image Transport System) files directly from the Finder. Instead of opening a dedicated application, you can inspect astronomical images and associated data instantly using the Finder preview pane. The plugin is small, integrates cleanly with macOS, and is suited to both professional researchers and hobbyists.

Main benefits

• Free to download and use, making it a budget-friendly choice for frequent FITS viewers
• Lightweight footprint so it won’t slow down your system or Finder performance
• Lets you preview FITS content without launching a separate program, speeding up simple inspections
• Integrates with the built-in Quick Look feature of macOS for a native feel
• Practical for both advanced researchers and casual astronomy fans who work with FITS images

How it streamlines your work

By surfacing FITS previews in Finder, QLFits removes the friction of repeatedly opening bulky analysis software for quick checks. This saves time during data review, simplifies file browsing, and improves day-to-day productivity when handling large sets of astronomical files.

Alternatives worth looking at

• Sysdig Inspect Free — listed as an alternative in some contexts
• Dedicated FITS viewers and astronomy tools if you need advanced analysis features
• Image- and data-processing suites that include FITS support for deeper inspection and editing

Quick setup notes

Install the plugin according to its macOS installation instructions, enable it in Finder’s Quick Look if necessary, and restart Finder or log out/in to activate the preview capability. Once installed, select a FITS file and press Space to view its contents immediately.