Home » Tip of The Day » Saving Documents Larger Than 2 GBSaving Documents Larger Than 2 GB March 28, 2017. Posted in: Tip Of The Day. PSDs have a file size limit of 2 GB. If you want to save a document that is larger than 2 GB, save it as a PSB (Large Document Format). « Previous Photoshop Tip: | Next Photoshop Tip: » Sign-up for the PTC Newsletter so that you'll never miss a tutorial!. Your Email Address: