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What is the difference between PSB (Photoshop Big) and PSD (Photoshop Document)?

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    I'm voting to close this question as off-topic because it's not a question about graphic design. Also, it can be easily answered by searching the internet. – Westside Dec 19 '16 at 8:40
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    @Chris: it can be easily answered by searching the internet – is no reason for closing. This site aspires to be what is found when searching the Internet. – Wrzlprmft Jan 3 '17 at 8:41
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If you check the Adobe help website it's stated right there:

Photoshop format (PSD) is the default file format and the only format, besides the Large Document Format (PSB), that supports all Photoshop features.

then

The Large Document Format (PSB) supports documents up to 300,000 pixels in any dimension. With documents larger than 30,000 pixels in width or height, some plug-in filters are unavailable.

And finally

Like most file formats, PSD supports files up to 2 GB in size. For files larger than 2 GB, save in Large Document Format (PSB), Photoshop Raw (flattened image only), TIFF (up to 4 GB), or DICOM format.

  • presumably, there is numeric representation limit in the PSD file format specification (and some filters) that is hit when the document gets to be 30K pixels. So for PSB either they use int64 etc, or they use a high-order+low-order word scheme (or ... ?). – Yorik Feb 17 '17 at 14:47
  • @Yorik I have no idea about the details on the PSD file format specification – Luciano Feb 17 '17 at 15:24
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the PSB file remove the limit of 30 000 pixel image size so when you work on a big size print project you gonna use psb instead of psd file :)

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If you want very detailed information you can check PSD/PSB file specification: https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/

Look for PSB tag in that document.

PSD has 4 bytes for bitmap dimension size but PSB has 8 bytes.

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