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What is FITS?

Flexible Image Transport System (FITS) is a scientific data format used primarily in astronomy for storing and transmitting images and datasets.

What is EXR?

OpenEXR is a high-dynamic-range raster image format developed by Industrial Light & Magic for the VFX and film industry.

When Should You Use FITS vs EXR?

Use FITS When...

Reach for FITS when your priority is astronomy, scientific imaging, research — its uncompromising quality ensures every detail is preserved.

Use EXR When...

Reach for EXR when your priority is vfx, 3d rendering, hdr imaging — its uncompromising quality ensures every detail is preserved.

FITS vs EXR: Key Differences

  • •FITS uses lossless compression while EXR uses lossless compression — both take the same approach to file size management.
  • •Since both FITS and EXR use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •Alpha channel support: EXR handles transparency.
  • •Storage footprint: Varies from 1MB to several GB for FITS vs 15-100MB for high-res HDR frames for EXR.
  • •Use case fit: FITS targets astronomy, scientific imaging, research and EXR targets vfx, 3d rendering, hdr imaging — your choice depends on which workflow stage you are serving.

Advantages of FITS

  • ✓FITS compresses data using lossless methods, keeping file sizes manageable for Astronomy, scientific imaging, research.
  • ✓Industry-wide support means FITS files open anywhere — from legacy systems to the latest devices.
  • ✓Lossless quality makes FITS the gold standard for archival and master copies.
  • ✓From professional software to open-source alternatives, FITS works out of the box.

Advantages of EXR

  • ✓EXR compresses data using lossless methods, keeping file sizes manageable for VFX, 3D rendering, HDR imaging.
  • ✓Industry-wide support means EXR files open anywhere — from legacy systems to the latest devices.
  • ✓Lossless quality makes EXR the gold standard for archival and master copies.
  • ✓From professional software to open-source alternatives, EXR works out of the box.

Common Use Cases for FITS to EXR Conversion

  • Brochure and flyer design
  • Newsletter graphics
  • Video thumbnail creation
  • Certificate and badge design
  • Websites and online content
  • Print materials and publications

Industry Applications

Real Estate PhotographyGame DevelopmentScientific VisualizationE-learning ContentWeb DevelopmentGraphic Design

Best Practices for FITS to EXR Conversion

  • →When converting FITS to EXR, check whether EXR supports transparency — if not, your transparent areas will be filled with a solid color
  • →Use EXR for maximum quality archival and FITS for lossless workflows
  • →Optimize images for web to reduce page load times — tools like our converter let you adjust quality settings before conversion
  • →Maintain original aspect ratio to avoid distortion during conversion
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

JPG vs PNG vs WebP: Which Image Format Should You Use?

Learn more about FITS and EXR formats in our detailed guide.

Troubleshooting FITS to EXR Conversion

  • !Converting FITS to EXR gives blurry output → increase the quality setting before conversion
  • !Colors look different in EXR than FITS → check color profile mismatch (sRGB vs Adobe RGB)
  • !File size changed more than expected → EXR uses different compression, file size differences of 2-5x are normal
  • !Transparent areas in FITS turned white in EXR → EXR may not support transparency

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Convert FITS to EXR Online - Free & Fast

Convert FITS files to EXR online for free. High-quality conversion with no registration required.

Image Converter

Upload or enter a URL to convert FITS to EXR instantly

Click to upload or drag & drop FITS file

or paste from clipboard

.fits,.FITS (max 100MB)

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About FITS and EXR

FITS

FITS (FITS data) - Flexible Image Transport System, scientific data format. Best for astronomy, scientific imaging, research.

EXR

EXR (OpenEXR images) - OpenEXR, high-dynamic-range raster format for film. Ideal for vfx, 3d rendering, hdr imaging.

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from astronomy, scientific imaging, research to vfx, 3d rendering, hdr imaging
File Size~15-100MB for high-res HDR frames after conversion

FAQs

Is converting FITS to EXR free?

Yes, GoConvertFile offers free conversion of FITS to EXR for files up to 100MB. No registration required.

How long does it take to convert FITS to EXR?

Most FITS to EXR conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is EXR best used for?

EXR is ideal for vfx, 3d rendering, hdr imaging. OpenEXR, high-dynamic-range raster format for film

What file size should I expect after converting FITS to EXR?

File size after FITS to EXR conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.

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