Photoshop PSB files are like oversized PSD files.

What Is a PSB File?

A file with the PSB (Photoshop Big)file extensionis an Adobe Photoshop Large Document file.

PSB files used by Photoshop

Photopea export options.

PSDs, on the other hand, are limited to 2 GB and image dimensions of 30,000 pixels.

How to Open a PSB File

PSB files that are images can be opened withAdobe Photoshop.

Use theSubtitle>Add Subtitle Filemenu to open one.

Photopea export options

Photopea export options.

It supports saving to PSD,JPG,PNG,EPS,GIF, and several other formats.

Those options and others, likePDFandSVG, are also supported in Photopea.

Another way to convert a PSB file without using Photoshop is with afree file converterlikeAconvert.

This website can convert the file to over a dozen other formats.

The only downside is that the upload file size is probably limited.

Still Can’t Open It?

If your file doesn’t open with the programs linked above, it’s probably a totally different file.

PBS is one example.

This file extension is used byPaintShop Probrush strokes files.

you’re free to’t open one with Photoshop, even though the file extension is similar to PSB.

If you really have aPSTfile, then it’s probably email data it’s storing, not images.