Best PDF Compression Settings for Every Use Case

Choosing the right compression level can be the difference between a blurry, unreadable file and a crisp, professional document that's still half the size. Here's a practical guide to every setting.

The Three Compression Levels Explained

Most quality PDF compressors — including compress-pdf.cc — offer three levels of compression. Each represents a different trade-off between file size and visual quality.

• Maximum compression — Aggressively resamples images to the lowest quality that remains readable. This produces the smallest possible output file. Best for scenarios where file size is critical and image quality is secondary.
• Balanced compression — A sensible middle ground. Images are compressed noticeably but still look sharp and clean at normal viewing sizes. This is the recommended default for most documents.
• Light compression — Applies only minimal image resampling. Produces a smaller file than the original while keeping images very close to their original quality. Best for visual documents where appearance matters most.

Use Case Guide: Which Level to Choose

• Email attachment with strict limit (e.g. under 10MB): Maximum compression
• Uploading to a government or university portal: Maximum or Balanced
• Business report or proposal for a client: Balanced
• CV / résumé: Balanced (most CVs are small enough that any setting works)
• Photography portfolio or design deck: Light compression
• Scanned document (e.g. signed contract): Balanced — scans are images and compress well
• Medical imaging or architectural drawings: Light compression or no compression
• Text-only PDF (no images): Any level — the difference will be minimal
• Ebook or digital magazine: Balanced

What Actually Changes at Each Level

Text, fonts, and vector graphics are never degraded at any compression level. Only embedded raster images (photos, screenshots, scanned content) are affected. Here's what changes:

• Maximum: Images resampled to ~35% quality at up to 1024px per side. Visible compression artifacts at close zoom but readable at 100%.
• Balanced: Images resampled to ~60% quality at up to 1600px per side. Clean appearance at normal sizes; slight quality loss only visible when zoomed in significantly.
• Light: Images resampled to ~80% quality at up to 2400px per side. Barely distinguishable from the original at most viewing sizes.

Our Recommendation

For the vast majority of documents — reports, invoices, contracts, presentations, CVs — Balanced compression is the right choice. It typically reduces file size by 50–70% while keeping the document looking polished and professional.

Only switch to Maximum when you're facing a hard file size limit and quality is less important. Only switch to Light when the document contains images that genuinely cannot afford any degradation.