Convert FITS images to PNG online

Turn an astronomical FITS image into a normalized PNG you can open in any image viewer.

You’ll need: FITS
40 MB max
You’ll get: PNG
How long: Under 1 min

Have a FITS image that will not open in a normal photo app? This page converts a FITS file to a PNG with automatic contrast adjustment.

How to convert FITS to PNG

Upload a FITS file up to 40 MB.
Press Convert file and download the PNG.

What you get

A single PNG image with auto-leveled contrast. The picture reflects the FITS pixel data in a viewer-friendly form.

When this helps

Sharing a quick preview of telescope or lab image data
Dropping a FITS frame into slides or documentation
Checking image content without specialized astronomy software

Common questions