Compress PDF Without Losing Quality — Free Online Tool
Why PDF Compression Matters
Email attachments over 25 MB get rejected. Slow-loading PDFs hurt UX on mobile. Large scanned documents choke cloud storage quotas. PDF compression reduces all of these problems — a 50 MB scanned report can become 5–10 MB with no visible quality loss for text and vector content.
What Gets Compressed
PDF compressor targets: (1) Embedded images — recompresses using JPEG or WebP at a lower quality tier, which has no effect on text sharpness. (2) Redundant streams — eliminates duplicate font subsets and object streams. (3) Metadata — strips unnecessary XMP and thumbnail data. Text remains pixel-perfect because text in PDFs is vector, not raster.
When NOT to Compress
Avoid compressing PDFs that contain: high-resolution photos for print (compression will visibly soften them), PDFs with embedded digital signatures (compression may invalidate the signature), or archival legal documents where lossless integrity is required. For these, use Merge, Reorder, or Password Protect instead.
Frequently Asked Questions
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