FV: The Interactive FITS File Editor



Due to increased difficulty in maintenance of the FV code and dependencies, we are retiring and discontinuing support of FV in favor of the new utility fviewer, included for testing in our 6.37 Conda packages or installable separately using:
pip install fviewer
HEASoft 6.37 is the final major release of the suite to include FV, but a stand-alone FV conda package (v5.5.4) was generated with HEASoft 6.37.1 for archival.


FV is an easy to use graphical program for viewing and editing any FITS format image or table. The FV software is small, completely self-contained and ready to run on
  • Linux (v5.5.2)
  • macOS (v5.5.2)
  • Windows PCs (v5.3 only)
FV can be used with the DS9 image display.

Download FV now...

animation showing the power
	of fv: header keywords, table spreadsheets, histogram and scatter plots,
	images and contours


Links to more FV information:

Send bug reports or feature requests via the FTOOLS help desk.
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Last modified: Thursday, 03-Sep-2026 16:39:38 EDT