X-Windows Screen Dump X11

Partly documented

other

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Identify it

Extensions	`.xwd.xdm`
Signatures	`000000??00000007000000` at byte 0 (X-Windows Screen Dump X11)
PRONOM	`fmt/401`

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Open it

Listed for the family; check that the software handles this version.

GIMPOpen sourcereads and writes · GNU General Public License, version 3.0
ImageMagickOpen sourcereads and writes · ImageMagick License
Hijaak Digital Photo Studioreads and writes
PaintShop Photo Pro X3reads and writes
xwdwrites
Adobe FrameMaker 5.5reads
ENVIreads · proprietary license

Convert it

To	With	Fidelity	Command and losses
Portable Network Graphics	ImageMagick	Lossless	`convert in.xwd out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
Tagged Image File Format	ImageMagick	Lossless	`convert in.xwd out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
GIF 89a	ImageMagick	Lossy	`convert in.xwd out.gif` Reduced to 256 colours.
JPEG File Interchange Format 1.02	ImageMagick	Lossy	`convert in.xwd out.jpg` Lossy compression.
WebP	ImageMagick	Lossy	`convert in.xwd out.webp` Lossy compression.

Documentation

kaitai grammar: https://github.com/kaitai-io/kaitai_struct_formats/blob/master/image/xwd.ksy

Sources

From Kaitai Struct format gallery, PRONOM. Updated 2026-10-24.

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