Adobe Photoshop Large Document Format

Writable

image

Adobe Photoshop is a raster graphics editor developed and published by Adobe Systems. The Large Document Format supports documents of up to 300,000 pixels in any dimension as opposed to the PSD limit of 30,000 pixels.

Identify it

Extensions	`.psb`
MIME types	`image/vnd.adobe.photoshop`
Signatures	`384250530002000000000000` at byte 0 (Adobe Photoshop PSB) `384250530002` at byte 0
PRONOM	`fmt/996`
Wikidata	`Q1437034`

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Open it

ImageMagickOpen sourcereads and writes · ImageMagick License
Q141647655Open sourcereads and writes · Apache Software License 2.0 / MIT License
ConverseenOpen sourcereads · GNU General Public License, version 3.0
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
PhotoRecOpen sourcereads · GNU General Public License
Zoner Photo Studioreads and writes
Affinity Photoreads
Clip Studio Paintreads · proprietary license
MediaRich Serverreads
Q129793reads · shareware
SAIreads · proprietary license

Convert it

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

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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