What is a .PSB file?
PSB is Photoshop’s large-document format for huge images. Created and opened by Adobe Photoshop.
- Did you know
- PSB was added in Photoshop CS (2003) to handle files beyond 30,000 pixels or 2 GB.
- PSB stands for “Photoshop Big”, and it can store canvases up to 300,000 by 300,000 pixels and files of around four exabytes.
- A standard .psd is capped at 30,000 pixels a side and 2 GB, so anything larger - giant panoramas or big print artwork - has to be saved as a .psb instead.
- What Analyser shows you
- Open Adobe Photoshop documents (PSD and PSB) in the browser: the flattened composite image Photoshop bakes in is shown, plus the full layer tree with each layer name, blend mode, opacity, visibility and a per-layer thumbnail. Reads the canvas dimensions, colour mode and bit depth. Files saved without Maximize Compatibility have no composite, so their layers are shown instead.
- Depth of analysis
- .PSB is a partial-analysis format: Analyser opens it and shows the embedded preview or thumbnail and the metadata it can read, but the real editable content stays in the application's proprietary format and is not reconstructed in the browser. Formats with a complete viewer are marked "Full" on the formats page.
- Open a .PSB file
- Drag a .PSB file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
- Related formats
- .PSD. See all supported file types.