FITS File Explorer
Open a FITS astronomy file. Read its headers, preview image data and download selected table rows with a report.
How can I view the images and tables inside a FITS file?
Upload an uncompressed FITS file and inspect its HDU inventory. Choose an extension by its zero-based index. Image HDUs produce a contrast-adjusted preview, with optional slice indexes for a cube; fixed-length tables export a selected row range as CSV. Download the headers, report and preview or table together as a ZIP.
Your result
A little clarity, right here.
Choose a file and run the tool. Your result will appear here, ready to download.
Three simple steps
How to use FITS File Explorer
Choose a local file or enter the coordinate table and review the processing notice.
Select the bands, image plane, crop bounds or coordinate frames you need.
Run the isolated service, review the report and download the result.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. When you run the tool, your input goes to a separate processing service. Temporary files are deleted when the job ends. You can download the result to your device.
What are the limits and details?
One file up to 8 MB, 32 HDUs and 4,096 cards per HDU; reports retain the first 500 cards per HDU. Images support four axes and eight million values. Tables support 50 columns and 5,000 selected rows per export, with 500 rows shown. Cells retain 1,000 characters or the first 32 array values. Variable-length table arrays, file-level compression, WCS reprojection, calibration and checksum verification are unsupported. BSCALE/BZERO and BLANK are applied. Preview orientation follows pixel axes, not celestial north.