How to Compress a PDF Without Losing Quality (Free)
Compress PDF files while keeping text sharp and images readable. Learn which compression setting to use for different document types.
All PDF compression involves some quality trade-off, but for most use cases the difference is imperceptible. The key is matching the compression level to how the document will be used. FixMyPDF's three-level compressor gives you control over this balance.
What Happens During PDF Compression
PDF compression mainly works on embedded images. Text and vector graphics compress efficiently with no visible quality loss. Images are re-encoded at a lower resolution — this is where the trade-off occurs. For screen viewing and typical business use, a reduction from 300 DPI to 150 DPI is completely invisible.
Which Compression Level to Use
Low compression: minimal quality reduction, smallest size savings. Use for documents going to print. Medium compression: balanced quality and size — the right choice for most shared documents. High compression: maximum size reduction, slight softening of images at large print sizes. Use for email attachments, upload forms, or archiving.
Documents That Compress Well With No Visible Loss
Text-only PDFs: near-lossless regardless of setting. Scanned documents: High compression still produces readable text. Business presentations: Medium compression works well — slide images remain clear on screen. Contracts and forms: any setting is appropriate since these are text documents.
Documents Needing Care
Photography PDFs, art portfolios, and print-ready files for professional printing should use Low compression or avoid compression entirely. For these, consider whether the recipient needs print quality or just a reviewable document — if the latter, Medium is fine.
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