.PSB File Extension
Reference for .PSB files supporting Photoshop documents larger than 2GB or 30,000x30,000 pixels.
image/vnd.adobe.photoshop
49 49 2A 00
Format Architecture & Technical Specifications
The .PSB format is a specialized digital image specification utilizing raster or vector encoding for graphical assets. It maintains structured color palettes, coordinate bounding boxes, and compressed pixel arrays. Files with the .PSB extension are categorized under Images and are widely utilized in modern computing environments for storing, rendering, and exchanging structured data. By verifying the header signature (49 49 2A 00) using forensic byte inspection tools, users can authenticate file integrity and rule out disguised executable payloads.
How to Open .PSB Files
1 Open .PSB on Windows 11 & 10
Locate the .PSB file in File Explorer. Right-click the file, select "Open with", and choose Adobe Photoshop. To set this application as the permanent default, check "Always use this app to open .PSB files" and click OK.
2 Open .PSB on macOS (Apple Silicon & Intel)
In Finder, hold Control and click the .PSB file, then hover over "Open With" to select Photopea or your preferred desktop application. To associate all .PSB files, press Command+I (Get Info), expand "Open with", and click "Change All".
3 Open .PSB on Linux & Unix Desktops
Open your file manager (Nautilus, Dolphin, or Thunar), right-click the .PSB file, and choose "Open With Other Application". Select Adobe Photoshop from the list or launch via terminal using native viewer commands.
4 Inspect .PSB in AnyFileX In-Browser Viewer
Drag and drop the .PSB file into the AnyFileX File Identifier to inspect its internal binary structure, confirm header integrity, and preview content without installing third-party utilities.
Compatible Software Programs
Adobe Photoshop
windows, mac, linux • Free
Photopea
windows, mac, linux • Free
Affinity Photo
windows, mac, linux • Free
Security Considerations & Verification
Supports document canvas dimensions up to 300,000 x 300,000 pixels Files ending in .PSB should always be inspected for valid magic bytes to verify they match legitimate Images specifications.
- Inspect File Header: Use the AnyFileX Magic Byte Detector to verify that the first bytes match 49 49 2A 00.
- Prevent Extension Spoofing: Ensure "File name extensions" is checked in your OS file manager to detect disguised double extensions (e.g., file.PSB.exe).
- Verify Checksum Integrity: Calculate SHA-256 or MD5 hashes against source downloads using our online Checksum Verifier.
- Inspect Container Structure: If PSB files fail to launch, verify whether the file was truncated during download or corrupted in transit.
Frequently Asked Questions
What is a .PSB file?
A .PSB file is a PSB File Format associated with Images. Reference for .PSB files supporting Photoshop documents larger than 2GB or 30,000x30,000 pixels.
How do I open a .PSB file on Windows or Mac?
You can open .PSB files using Adobe Photoshop, Photopea, Affinity Photo. If you do not have native software installed, you can use AnyFileX's free File Identifier or convert .PSB to a standard format in your browser.
Is a .PSB file safe to open?
This format carries a safety rating of Low Risk. Supports document canvas dimensions up to 300,000 x 300,000 pixels Files ending in .PSB should always be inspected for valid magic bytes to verify they match legitimate Images specifications.
Can I convert a .PSB file to other formats?
Yes! .PSB can be converted to formats such as .PNG directly in your web browser.
What should I do if a .PSB file is corrupted or won't open?
If your .PSB file displays an invalid header or signature error, check its magic bytes hex header (49 49 2A 00) using AnyFileX's Magic Byte Detector or follow our step-by-step file repair guide.
How do I open a .PSB file without installing software?
You can inspect and view .PSB files directly in your web browser using AnyFileX tools such as the File Identifier and Hex Viewer, which process files 100% locally in browser memory without server uploads.
Can a .PSB file contain viruses or malware?
Files with the .PSB extension are rated as Low Risk. While legitimate files are standard, attackers often disguise dangerous executables by renaming them. Always verify magic bytes before running unknown files.
How can I convert a .PSB file to another format?
You can convert .PSB files to standard formats using AnyFileX in-browser converters or compatible desktop software like Adobe Photoshop. In-browser conversion ensures 100% privacy with zero data transfer to external servers.