The free FITS file viewer.

Open and explore FITS images instantly — no sign-up, no install, no cost. Inspect pixel data, WCS coordinates, image statistics, and full header metadata, all in your browser.

Drop a FITS file here

.fits · .fit · .fts

processed locally — your files stay private

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Color maps

15+ scales, stretch & contrast

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WCS coords

Live RA / Dec cursor readout

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Statistics

Mean, σ, sigma-clipping

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Histogram

Interactive pixel distribution

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FITS headers

Full keyword table viewer

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Region select

Crop and measure any area

Free forever

No account, no paywall, no limits

15 + colormaps

Linear, log, asinh, square root & more

.fits .fit .fts

All standard FITS formats supported

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