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EPUB at a glance
EPUB
EPUB grew out of the digital publishing standards ecosystem and later moved under W3C stewardship, reinforcing its identity as an open publishing format rather than a vendor-specific storefront file.
PSB at a glance
PSB
Photoshop's native format became one of the de facto interchange anchors of raster design and retouching, even outside Adobe-only teams, because so many creative pipelines converged around its feature set.
Format comparison
| Feature | EPUB | PSB |
|---|---|---|
| File type | Ebook | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2007 | 1990 |
| Inventor | IDPF / W3C | Adobe |
| Status | active | proprietary |
| Primary use cases |
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When to use each format
When to use EPUB
- Your source file is already in EPUB.
- Preserve source expectations before exporting to PSB.
- EPUB is commonly used in ebook workflows.
When to use PSB
- Your target workflow expects PSB.
- Improve delivery compatibility with PSB.
- PSB is commonly used in image workflows.
FAQs
Why convert EPUB to PSB?
Convert to PSB when the image must remain editable in Photoshop at very large dimensions or layer counts.
It is useful for oversized composites, print backdrops, and complex production artwork.
What changes when converting EPUB to PSB?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting EPUB to PSB?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.