Host a FITS file and share it as a link
Put astronomical data online at its own address — the format telescopes and observatories use.
Drop your FITS file here
Any other file works too — up to 25.0 MB, or 100.0 MB for a whole site
Free to use. Your FITS file is live at your-name.99helpers.site in about ten seconds.
What is a .fits file?
FITS (Flexible Image Transport System) is the standard format for astronomical data, in use since 1981 and still the format every major observatory publishes in. It stores image data at high bit depths alongside an extensive header of observation metadata — telescope, exposure, coordinates, timestamps.
What people use FITS files for
- Telescope and observatory data
- Astrophotography before processing
- Published astronomical datasets
- Scientific archives
What opens a FITS file
- SAOImageDS9 and FITS Liberator
- PixInsight and AstroPixelProcessor
- astropy in Python
- No browser displays FITS
How to host a FITS file
- 1
Drop your FITS file in
Drag it onto the box at the top of this page, or click to choose it. Files up to 25 MB are supported, and nothing is uploaded until you publish.
- 2
Pick an address
Type a name and we'll tell you straight away whether it's free. That becomes the link: observation.99helpers.site
- 3
Publish and share
Create a free account — that step exists so the file is yours to update, replace or delete — and the link is live within seconds.
The same three steps work for any file — see how file hosting works on 99helpers.com.
What happens when someone opens the link
The file downloads. FITS holds scientific data with far more dynamic range than a screen can show, so there's nothing meaningful to render.
Why host a FITS file instead of emailing it?
Astrophotographers and researchers share raw frames constantly, and a link handles files that email won't.
Worth knowing before you publish
- Host a stretched JPEG or PNG alongside so people can see the image without astronomy software.
- The FITS header carries all the observation metadata — that's often the most valuable part.
- Deep-sky frames are frequently over 25 MB; a compressed variant or a crop may be needed.
FITS hosting questions
- What opens a FITS file?
- SAOImageDS9, FITS Liberator and PixInsight, or astropy if you're working in Python. No browser displays them.
- Why won't it display in the browser?
- FITS stores scientific measurements with far more dynamic range than a screen can show — it needs stretching and tone mapping before it means anything visually.
- What's in the FITS header?
- Telescope, instrument, exposure time, sky coordinates, timestamps and filters. For research it's often as important as the pixel data.
Put your FITS file online now
It takes about ten seconds, and you only make an account once the file is ready to go live.
Hosting guides for related formats
FITS is one of over 211 formats you can host — see free file hosting for any file type for the full list, or read the hosting guides for other file types.