CFITSIO - A FITS File Subroutine Library

Quick Start Guide C Reference Guide

CFITSIO is a library of C and Fortran subroutines for reading and writing data files in FITS (Flexible Image Transport System) data format. CFITSIO provides simple high-level routines for reading and writing FITS files that insulate the programmer from the internal complexities of the FITS format. CFITSIO also provides many advanced features for manipulating and filtering the information in FITS files.

Fourth Beta version of the next 3.38 release of CFITSIO is available for testing:

Download the latest 3.370 version of CFITSIO (see what's new) :


Help Desk:

  • Submit questions or bug reports related to CFITSIO to the CFITSIO/CCFITS help desk.

Related Software Tools:

Interfaces for calling CFITSIO from Other Programming Languages:

E-mail Notification List

Latest News
  • June 2014
    CFITSIO Version 3.37 released. This release contains a few relatively minor enhancements and bug fixes (see what's new).
  • 6 December 2013
    CFITSIO Version 3.36 released.
  • 26 June 2013
    CFITSIO Version 3.35 released.
  • 12 Dec 2011
    New version 2.4 of CCFITS has been released. CCfits is an object oriented interface to the CFITSIO library written in C++.
  • 10 July 2010
    Try the new fpack and funpack FITS image compression utility programs. They are faster and produce higher compression than GZIP.
  • July 2009
    Release of version 5.3 of the interactive Fv FITS file editor .

The latest reference to CFITSIO is: Pence, W. 1999, in ASP Conf. Ser., Vol. 172, Astronomical Data Analysis Software and Systems VIII, ed. D. Mehringer, R. Plante, and D. Roberts (San Francisco: ASP), 487

CFITSIO was developed by: Dr. William D. Pence,

Any questions or bug reports related to CFITSIO should be submitted to the CFITSIO/CCFITS help desk.

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Last modified: Saturday, 16-Jan-2016 11:40:05 EST