We have found 5 software records in our database eligible for .psb to .psd file format conversion.
The only way how to convert PSB images to PSD, would be to use Adobe Photoshop, because it is highly unlikely that some other, 3rd party software would be capable of psb to psd conversion.
It may also be needed to resize the contents of .psb file and resize the canvas in Photoshop so the final file size is not greater than 2GB. This is because .psb files are typically created and automatically saved by Photoshop when the size exceeds the maximum Photoshop's limit for a .psd file.
PSB
Files with psb file extension can be most often encountered as graphics files from Adobe Photoshop. It's a JPEG 2000 based bitmap format for very large images. This format is only compatible with some later editions of Photoshop.
PSD
A psd file extension is traditionally associated with default graphic format of Adobe Photoshop. Adobe psd graphics file is pixel based graphics file format. However some graphic elements can be stored in vector graphics. In default psd graphics file contains layers with masks, color spaces, ICC profiles, transparency, text, alpha channels and spot colors, clipping paths, and duotone settings.