PDF vs EPUB: When to Use Which
PDF and EPUB are both used for digital publications but serve different reading experiences. PDF preserves exact page layouts as designed, while EPUB reflows text to fit any screen — from a phone to a desktop. The right choice depends on whether layout precision or reading comfort matters more.
Understand the key differences between these formats and when to use each one.
PDF vs EPUB: When to Use Which — Feature Comparison
| Feature | SublimePDF | EPUB |
|---|---|---|
| Text reflow | No — fixed layout, requires zoom on small screens | Yes — text adapts to any screen size |
| Reading on phones | Poor — requires zooming and scrolling | Excellent — text reflows to screen width |
| Layout preservation | Exact — every element stays in place | Approximate — layout adapts to device |
| Image-heavy content | Excellent — precise image placement | Limited — images may resize or reposition |
| Font customization | Fixed — reader can't change fonts | Reader can change font, size, and spacing |
| DRM support | Adobe DRM, permissions | Adobe DRM, Apple FairPlay |
| Software support | Universal — browsers, readers, OS built-in | E-readers, Apple Books, Calibre, some browsers |
| File size | Often larger (embedded fonts/images) | Typically smaller (optimized for text) |
| Annotation | Wide annotation tool support | Varies by reader app |
| Textbook / technical content | Better — preserves diagrams, equations, tables | Difficult — complex layouts don't reflow well |
Key Differences
The Verdict
Choose EPUB for text-heavy books where comfortable reading on any device matters — novels, articles, and simple non-fiction. Choose PDF for documents where visual layout is essential — textbooks with diagrams, design portfolios, technical manuals with precise formatting. SublimePDF can help you convert between formats when your needs change.
SublimePDF's client-side architecture is built on WebAssembly and processes files in the PDF open standard (ISO 32000), ensuring compatibility and privacy across all platforms.