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Free FITS Converter Online

Convert FITS astronomical images to standard formats

Convert FITS Files

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Convert FITS to Other Formats

Convert your FITS files to 4 different formats

FITS→PNGFITS→JPGFITS→WEBPFITS→PDF

FITS Converter Features

Why choose our FITS converter

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Astronomy standard

Astronomy standard

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Scientific data

Scientific data

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Multi-dimensional

Multi-dimensional

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Metadata support

Metadata support

How to Convert FITS Files

Converting FITS files is quick and easy

Upload Your File

Drag and drop your file or click to browse. We support over 300 file formats. 💡 Pro Tip: You can drag and drop multiple files at once!

Choose Output Format

Select your desired output format from our comprehensive list of options.

Convert Instantly

Our powerful servers process your file in seconds with high quality results.

Download Result

Download your converted file immediately. Files are kept for 24 hours.

About FITS Format

FITS FITS is a image format. Astronomy format.

FITS Technical Details

  • Full Name: Flexible Image Transport System
  • Developer: NASA/NRAO
  • Compression: Various
  • Transparency: Not Supported
  • Animation: Not Supported
  • Lossless: Yes

Common FITS Use Cases

  • Astronomy
  • Scientific imaging
  • Space research
  • Astrophotography

Convert FITS to Any Format

With FreeFast, you can convert FITS files to 4 different formats including PNG, JPG, WEBP, PDF. Each conversion uses settings for the selected output format, with results depending on the source file and target format.

Why use FreeFast for FITS conversion?

FreeFast is a browser-based FITS converter built for practical file jobs. It focuses on clear conversion paths, visible limits, and useful output without installing extra software:

  • Free daily credits and no watermarks: Start with 10 free daily conversions and download output files without branding.
  • Bulk/batch converter support: Upload and convert multiple FITS files within plan, browser, and file-size limits.
  • No signup to start: Start converting files without creating an account for your first file jobs.
  • Quality controls: Conversion settings are chosen for the selected format pair, with results depending on the source file and output type.
  • Encrypted transfer: Uploads and downloads use HTTPS/TLS, and temporary files are cleared after the processing and deletion window.

FreeFast FITS Converter Specification Table

FeatureSpecification Details
Max Upload File Size1 GB (1,000 MB) per conversion
Privacy and Deletion PolicyConfigured result-retention window
File TransferHTTPS/TLS uploads and downloads
Batch & Bulk ProcessingSupported within plan and browser limits
Compatible Operating SystemsWindows, macOS, Linux, iOS, Android, ChromeOS
Account SignupNo signup required for your first file jobs
Watermarks & Visual EditsNone. Output files are clean and unmodified

End-to-End Privacy & File Safety

Files are handled for the conversion you request. Uploads and downloads use HTTPS/TLS, and temporary files are cleared after the processing and deletion window.

Format comparison notes

When choosing between formats, understanding key attributes helps optimize quality and compatibility:

Strengths of FITS

  • Authoritative standard optimized for high compatibility.
  • Exceptional balance between quality and file footprint.
  • Supported out of the box by modern browsers, editors, and OS.

Quality and compression

While converting files, the processor handles scaling, color spaces, metadata, and bitrates where the selected workflow supports them. Review downloaded files before sharing important work.

FreeFast converter link badge

Add a simple link badge to a help article, intranet page, or workflow checklist when readers need a direct FITS conversion shortcut:

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Other Image Formats

pngjpgjpegwebpgifbmptifftificojfif

FITS Converter FAQ

FITS (Flexible Image Transport System) is an image file format. You can convert FITS files using our free online converter.
Upload your FITS file, select output format, and click Convert. Done in seconds.
Yes! Completely free with no limits or watermarks.
Convert FITS to PNG, JPG, WEBP, GIF, BMP, TIFF, and more.

Ready to Convert Your FITS Files?

Start with 10 free daily conversions. No signup required for your first file jobs.

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