.PSB File Extension

Photoshop Large Document Format

Developer Adobe Systems
Popularity
3.5  |  49 Votes
 
NEW: Open your .PSB file online with File Helper.View Online

What is a PSB file?

A PSB file is a large image file saved in the Adobe Photoshop Big (PSB) format, which Adobe Photoshop uses to store high-resolution images that exceed the size limits of the standard Photoshop Document (.PSD) format. It contains all the same editable features as a PSD file, including layers, masks, text, and effects, but is used specifically for images larger than 30,000 by 30,000 pixels or greater than 2 GB in file size. PSB files are helpful for working on detailed or complex Photoshop projects that require more space than the PSD format allows.

More Information

Screenshot of a .psb file in Adobe Photoshop 2025
PSB file open in Adobe Photoshop 2025

Photoshop users save projects as PSB files when working with large graphics, such as detailed print layouts, 3D compositions, or high-resolution digital artwork, that require more space than the PSD format allows. The PSB format supports images up to 300,000 x 300,000 pixels, the maximum image size Photoshop permits. Adobe designed the format to maintain full editing capabilities on oversized projects without losing detail or structural data.

Although PSB files are nearly identical to PSD files in terms of structure and functionality, they are not widely supported outside Adobe software. Most third-party image editors do not support PSB files, so using them in workflows that rely primarily on Adobe Photoshop is best.

How to open a PSB file

You can open a PSB file in Adobe Photoshop in Windows and macOS. To open a PSB file, select File → Open..., then choose the PSB file.

In macOS, you can preview the image a PSB file contains with the Quick Look feature (by selecting your PSB file and pressing your spacebar), though this may not work for very large or complex files.

How to convert a PSB file

Adobe Photoshop can convert PSB files to the following formats:

  • .PSD - Adobe Photoshop Document
  • .PSDC - Adobe Photoshop Cloud Document
  • .PDF - Portable Document Format
  • .JPG - JPEG Image
  • .PNG - Portable Network Graphic
  • .TIF - Tagged Image File Format
  • .GIF - Graphical Interchange Format
  • .WEBP - WebP Image
  • .AI - Adobe Illustrator Artwork
  • .BMP - Bitmap Image
  • .DCM - DICOM Image
  • .EPS - Encapsulated PostScript
  • .TGA - Targa Graphic

Programs that open PSB files

PowerDivX Subtitles File

Developer PowerDivX
Popularity
3.8  |  17 Votes
 

Movie subtitles file created for use with PowerDivX, an older multimedia player; saves subtitles in a simple text format, specifying the start and stop time of each subtitle; for example:

More Information

{0:01:21}{0:01:51}My Movie Subtitle 1.
{0:01:21}{0:01:51}My Movie Subtitle 1.

The PSB format is still supported by VLC media player.

Programs that open or reference PSB files

Verified by FileInfo.com

The FileInfo.com team has independently researched all file formats and software programs listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

If you would like to suggest any additions or updates to this page, please let us know.