Document Formats: PDF, Word & eBooks Explained
From fixed-page PDFs built for printing to flowable Word documents built for editing, choosing the right format prevents layout shifts and missing fonts.
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Format Comparison & Technical Specifications
| Output Format | MIME Type | Specification | Type |
|---|---|---|---|
| PDF PDF | application/pdf | ISO-32000-2 | Portable Document Format |
| DOCX Word Document | application/vnd.openxmlformats-officedocument.wordprocessingml.document | ISO-IEC-29500 | Microsoft Word OpenXML Document |
| EPUB eBook | application/epub+zip | W3C-EPUB-33 | Electronic Publication eBook |
| TXT Plain Text | text/plain | RFC-4180-CSV | Unformatted Plain Text |
| HTML Document | text/html | W3C-SVG | HyperText Markup Document |
Technical Specifications & Codec Breakdown
PDF vs. DOCX: Fixed Layout vs. Reflowable Text
PDF locks text and graphics to exact physical coordinates so a document looks identical on every screen and printer. DOCX is a flowable XML document designed for editing - change the font or margins, and all text below shifts automatically.
Why PDF to Word Conversion Shifts Formatting
PDFs don't store paragraphs or tables - they store raw visual coordinates (e.g. 'draw character A at X=120, Y=340'). Converters must intelligently reconstruct sentences and tables from scattered coordinate positions, which is why complex multi-column PDFs can experience slight formatting shifts when exported to DOCX.
When to Use Which Format
Use PDF for final contracts, invoices, resumes, and anything meant to be printed or signed. Use DOCX for drafts, collaborative writing, and editable templates. Use EPUB for e-readers because text resizes dynamically to fit any screen.
Font Embedding & Universal Compatibility
If you send a Word document using a custom font the recipient doesn't have installed, their computer substitutes a generic font, often breaking the layout. Converting to PDF embeds the exact font glyphs into the file, ensuring 100% visual fidelity everywhere.
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