Convert FITS to PNG Online

Convert FITS to PNG - Complete Guide

Converting FITS to PNG stays in the raster image family but changes the traits that decide size, quality, transparency, editability, or device support. FITS is a image format. Astronomy format. PNG is a lossless image format commonly used for screenshots, transparent graphics, logos, and high-quality web images. Below is what actually changes in a FITS→PNG conversion, what is preserved, and when PNG is the better choice than keeping FITS.

What changes when you convert FITS to PNG

• PNG supports transparency, but converting from FITS does not add it — areas that were solid in the FITS file stay solid.

About the FITS format

FITS is the standard format for astronomical data. Convert FITS to viewable image formats.

• Full name: Flexible Image Transport System
• Developer: NASA/NRAO
• Introduced: 1981
• Compression: mixed
• Opens with: DS9, FITS Liberator, AstroPy

Where FITS is strong: the standard for astronomical imaging data; stores high-precision pixel values with rich metadata headers; supports multi-dimensional scientific data.

Typical FITS uses: astronomy and telescope imaging, scientific data archives.

About the PNG format

PNG (Portable Network Graphics) is a lossless image format that supports transparency. Our free PNG converter allows you to convert PNG files to JPG, WEBP, GIF, BMP, PDF, and many other formats. You can also convert any image format to PNG to take advantage of its transparency and lossless compression.

• Full name: Portable Network Graphics
• Developer: PNG Development Group
• Introduced: 1996
• Compression: Lossless (DEFLATE)
• Color depth: 24-bit (16 million colors) + 8-bit alpha
• Opens with: every browser, Photoshop, GIMP, Figma

Where PNG is strong: lossless quality with no compression artifacts; full alpha transparency; crisp text, screenshots, and line art.

Typical PNG uses: screenshots, logos and UI graphics, images that need transparent backgrounds.

What PNG keeps

• Image dimensions (width and height in pixels) stay the same unless you resize.
• PNG adds: lossless quality with no compression artifacts.

Things to watch out for

• One PNG limitation to keep in mind: larger files than JPG for photographs.

When to convert FITS to PNG

• Convert FITS to PNG for screenshots.
• Convert FITS to PNG for logos and UI graphics.
• Convert FITS to PNG for images that need transparent backgrounds.
• Choose PNG when a website, browser, or upload form rejects your FITS file.

FITS vs PNG — format comparison

A quick side-by-side of the structural differences between FITS and PNG, so you can confirm this is the right conversion for your file:

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