Photoshop Large Document Format (.psb)

The PSB file extension is used in Adobe Photoshop, the premier software for advanced image editing. PSB, short for "Photoshop Big" is designated for saving large document format files. It becomes the go-to option when image dimensions surpass the standard PSD format’s threshold of 30,000 x 30,000 pixels or a 2 GB file size. The PSB format can accommodate images up to an extraordinary 300,000 x 300,000 pixels and supports a maximum file size of 4 Exabytes (EB)—equivalent to over 4.2 billion GB. Such large files are typically necessitated in industries requiring ultra-high-resolution images, such as professional photography, satellite imagery, and cutting-edge graphic design.

Retaining all the modifiable attributes of a PSD file, including layers, masks, colors, and text, the PSB format is fine-tuned for grand-scale projects. Its capacity for immense size makes it indispensable for professionals engaged in intricate graphics work, where deep zoom levels are essential without compromising image sharpness. Nevertheless, the PSB file's specialized nature means limited support across software platforms. Adobe Photoshop remains the primary application for accessing and modifying PSB files, although other Adobe products are also compatible with this format.