Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.PSB
File Type
Photoshop Big
Category
Image
Best first step
Use compatible software
Quick Summary
A practical overview of the .psb file format
The PSB file format, also known as "Photoshop Big," is an Adobe Photoshop file format designed to support extremely large images. It is essentially an extended version of the more common PSD format, but without the size limitations. While PSD files are limited to a maximum size of 2 gigabytes and d…
File extension
.PSB
File type
Photoshop Big
Category
Image
Recommended action
Open with a trusted compatible app
How to open a .psb file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .psb.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .psb file?
File extension details and usage information
The PSB file format, also known as "Photoshop Big," is an Adobe Photoshop file format designed to support extremely large images. It is essentially an extended version of the more common PSD format, but without the size limitations. While PSD files are limited to a maximum size of 2 gigabytes and dimensions of 30,000 pixels in either height or width, PSB files can handle images up to 4 exabytes in size and dimensions of up to 300,000 pixels in either direction. This makes PSB ideal for working with very high-resolution images, such as those used for large-format printing, panoramic photography, scientific imaging, and other applications where detail and scale are paramount. PSB files retain all the features of PSD files, including layers, channels, paths, guides, and color modes, ensuring that complex image editing workflows can be maintained even with massive file sizes. They are fully compatible with Adobe Photoshop and other Adobe Creative Suite applications.
Software Compatibility
Programs that may open or work with .psb files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .psb files be converted?
Options for saving or exporting this file to another format
In many cases, a .psb file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .psb file.
Why can't I open a .psb file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .psb format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .psb files
To open a .psb file, use software that supports this file format.
- Adobe Photoshop
- Adobe Photoshop Elements
- Corel PaintShop Pro
- IrfanView (with plugins)
- XnView MP
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .psb file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.