: 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

@Eichhorn212

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.

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