PDF optimization is more than just compression. A well-optimized PDF loads faster, downloads smaller, and displays correctly on any device. Here's the complete guide.
Why PDFs Get Large
- → Embedded images: The #1 cause of large PDFs. Images exported at 300 DPI or uncompressed
- → Embedded fonts: Custom fonts add 100-500KB each
- → Metadata and comments: Can add unnecessary size
- → Unnecessary pages: Extra blank pages from printing
Quick Optimization — Use FileCurve
- 1. Compress PDF — reduces embedded image quality
- 2. Split PDF — remove unnecessary pages before sending
- 3. Compress first, then remove pages for smallest final file
Compression Levels Explained
- Screen quality (72 DPI): Minimum size. Only for on-screen viewing — not for printing. Good for sharing previews.
- eBook quality (150 DPI): Good balance. Readable on screens, acceptable for casual printing. Recommended for email.
- Printer quality (300 DPI): Good print quality but larger files. Use for documents that will be printed.
- Prepress quality (300 DPI + color profile): For professional print. Largest files.
Fast Web View (Linearization)
A "fast web view" or linearized PDF loads page-by-page as you scroll, rather than waiting for the whole file. In Acrobat: Save As → Optimize for Fast Web View. This doesn't reduce file size but dramatically improves the user experience for large PDFs on slow connections.
PDF/A for Long-Term Archiving
If you need to archive PDFs for 10+ years, use PDF/A format. It embeds all fonts and color profiles, ensuring the document renders identically regardless of future software. Slightly larger files, but guaranteed long-term fidelity.