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What is ICO?

ICO (Icon) is a file format for computer icons in Microsoft Windows. ICO files contain one or more small images for application icons and favicons.

What is FITS?

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

When Should You Use ICO vs FITS?

Use ICO When...

Reach for ICO when your priority is favicons, application icons, platform-specific assets — its uncompromising quality ensures every detail is preserved.

Use FITS When...

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

ICO vs FITS: Key Differences

  • •ICO and FITS diverge on compression: lossless compression for the source, lossless compression for the target.
  • •Since both ICO and FITS use lossless compression, the quality characteristics are comparable — differences in file size come down to how efficiently each format implements compression.
  • •Transparency: N/A - Scientific data format
  • •Storage footprint: 1-16KB for ICO vs Varies from 1MB to several GB for FITS.
  • •Primary audience: ICO is built for favicons, application icons, platform-specific assets scenarios, while FITS focuses on astronomy, scientific imaging, research — pick the format that matches your output requirement.

Advantages of ICO

  • ✓At its core, ICO relies on lossless encoding — a design choice that makes it perfect for Favicons, application icons, platform-specific assets.
  • ✓You won't run into compatibility issues with ICO — it's a universal standard across platforms.
  • ✓File size management with ICO: larger files guaranteed to match the original exactly.
  • ✓Every major application in the Favicons, application icons, platform-specific assets space supports ICO natively.

Advantages of FITS

  • ✓FITS uses lossless compression tailored for Astronomy, scientific imaging, research.
  • ✓FITS is supported natively on virtually every device, browser, and operating system.
  • ✓FITS files are bit-for-bit perfect, preserving every pixel and sample for professional work.
  • ✓FITS integrates seamlessly with all major creative tools and workflows.

Common Use Cases for ICO to FITS Conversion

  • Email marketing campaigns
  • Presentation graphics
  • Blog and article illustrations
  • Mobile app UI assets
  • Product photography for marketplaces
  • Digital art portfolios

Industry Applications

Digital ArtUI/UX DesignAdvertisingBrand ManagementContent ManagementMedical Imaging

Best Practices for ICO to FITS Conversion

  • →When converting ICO to FITS, check whether FITS supports transparency — if not, your transparent areas will be filled with a solid color
  • →Use FITS for maximum quality archival and ICO for smaller file sizes when quality is less critical
  • →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 ICO and FITS formats in our detailed guide.

Troubleshooting ICO to FITS Conversion

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

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Convert ICO to FITS Online - Free & Fast

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

Image Converter

Upload or enter a URL to convert ICO to FITS instantly

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.ico,.ICO (max 100MB)

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About ICO and FITS

ICO

ICO (ICO icons) - Icon - Windows favicon and application icon format. Best for favicons, application icons, platform-specific assets.

FITS

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

Format Comparison

CompressionLossless → Lossless
TransparencySupported
Use CaseConvert from favicons, application icons, platform-specific assets to astronomy, scientific imaging, research
File Size~Varies from 1MB to several GB after conversion

FAQs

Is converting ICO to FITS free?

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

How long does it take to convert ICO to FITS?

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

What is FITS best used for?

FITS is ideal for astronomy, scientific imaging, research. Flexible Image Transport System, scientific data format

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

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

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