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.psb

Photoshop large document

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PSB is Photoshop’s large-document format for images exceeding PSD limits. Viewer and third-party support can differ from PSD. Separate layered source preservation from print or viewing output, and check disk space and linked assets.

Main use
Saving large Photoshop editing documents
Data type
Binary data / document
All sections, questions and sources

Content reviewed： · Editor：Kai

Example: a practical checking sequence

Example: a recipient cannot open a poster PSB. Clarify editing versus printing. Check PSD limits before preparing an editable copy; downscale/flatten only copies. For print delivery, verify output quality, linked assets and fonts while retaining layered PSB.

Opening steps

Choose your environment or purpose to see its steps.

Open in desktop Photoshop

Large documents need storage and working disk space.

  1. Copy PSB and linked assets and check free space.
  2. Open in Photoshop and inspect dimensions, layers and color mode.
  3. Save a separate PSB and reopen for verification.
Receive it in other software

Define the required use rather than assuming full layer compatibility.

  1. Check recipient PSB support and size limits.
  2. Request viewing output or discuss an appropriately sized editable alternative.
  3. Verify output dimensions, color and preserved layers.

Menu labels and support vary by app, OS and version. Preserve the original before making changes.

Troubleshooting by symptom

  • PSD saving fails: check dimensional and file-size limits.
  • Viewer failure: PSD support does not necessarily include PSB.
  • Save error: check free space, scratch disk, syncing and external storage.
  • Missing content: check linked Smart Object source assets.
  • Only a flattened image is available: check layer support and compatibility-image settings.

PSB → PSD / PNG / JPEG by purpose

  1. Preserve layers and create a working copy.
  2. Check PSD limits for editing or export display images at required dimensions.
  3. Reopen and inspect colors, text, images and retained features.

Downscaling or flattening is not reversible; keep PSB and tailor copies to recipient requirements.

Check PSD and PSB limits

Adobe documents PSD limits including 2 GB and 30,000 pixels; PSB handles larger documents. Check feature and output limitations as well.

Source for these steps：Adobe · Save large documents in Photoshop

Transfer assets with the document

Missing linked images, fonts or color settings can change appearance even when PSB opens. Provide a visual reference and asset inventory.

  • Locate external dependencies.
  • Check font licensing.
  • Check delivery dimensions and color space.

Related-format differences

Related-format differences
Format / purposeUse and preserved information
PSBLarge layered editing source.
PSDCommon editing document within its limits.
PNG / JPEGDisplay image without editable layers.

Handling and security

Layers and linked assets can contain unpublished information; share only required content and avoid unknown converters.

Questions and answers

Will every PSD viewer open PSB?

Check PSB support and limits.

Can I rename it to PSD?

Use actual saving with verified limits.

Should I flatten it to reduce size?

Flatten only a copy; retain layers in the original.

Is space for the final file enough?

Working and temporary disk space also matters.

What if content is missing?

Check linked source assets.

Format facts: name, steward and MIME type
Formal name
Photoshop Large Document Format
Steward / specification
Adobe
MIME type
Check the producer or implementation; do not assume a single universal MIME value.

Primary and official sources