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What is XWD?

X Window Dump (XWD) is the native screenshot format for X11 windowing systems, capturing pixel data from X displays.

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 XWD vs FITS?

Use XWD When...

Reach for XWD when your priority is x11 screenshots, remote display capture — 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.

XWD vs FITS: Key Differences

  • •XWD uses lossless compression while FITS uses lossless compression — both take the same approach to file size management.
  • •Neither format changes compression philosophy — both are lossless compression — so any size differences are due to encoding efficiency, not a shift in quality approach.
  • •How transparency is handled: FITS supports transparency, so alpha information is preserved during conversion.
  • •XWD files are typically Similar to uncompressed PNG while FITS files range Varies from 1MB to several GB
  • •Primary audience: XWD is built for x11 screenshots, remote display capture scenarios, while FITS focuses on astronomy, scientific imaging, research — pick the format that matches your output requirement.

Advantages of XWD

  • ✓At its core, XWD relies on lossless encoding — a design choice that makes it perfect for X11 screenshots, remote display capture.
  • ✓You won't run into compatibility issues with XWD — it's a universal standard across platforms.
  • ✓File size management with XWD: larger files guaranteed to match the original exactly.
  • ✓Every major application in the X11 screenshots, remote display capture space supports XWD natively.

Advantages of FITS

  • ✓FITS applies lossless compression specifically calibrated for Astronomy, scientific imaging, research.
  • ✓FITS enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓FITS guarantees every bit of the original data survives — no approximations, no shortcuts.
  • ✓You will find FITS support built into virtually every tool that handles Astronomy, scientific imaging, research — no plugins or converters needed.

Common Use Cases for XWD 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 XWD to FITS Conversion

  • →When converting XWD 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 XWD 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 XWD and FITS formats in our detailed guide.

Troubleshooting XWD to FITS Conversion

  • !Converting XWD to FITS gives blurry output → increase the quality setting before conversion
  • !Colors look different in FITS than XWD → 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 XWD turned white in FITS → FITS may not support transparency

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Convert XWD to FITS Online - Free & Fast

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

Image Converter

Upload or enter a URL to convert XWD to FITS instantly

Click to upload or drag & drop XWD file

or paste from clipboard

.xwd,.XWD (max 100MB)

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About XWD and FITS

XWD

XWD (XWD screenshots) - X Window Dump, screenshot format for X11 systems. Best for x11 screenshots, remote display capture.

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 x11 screenshots, remote display capture to astronomy, scientific imaging, research
File Size~Varies from 1MB to several GB after conversion

FAQs

Is converting XWD to FITS free?

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

How long does it take to convert XWD to FITS?

Most XWD 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 XWD to FITS?

File size after XWD 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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