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PDF Compressor
Reduce PDF file size by compressing embedded images and removing unnecessary metadata. Choose your compression level. Your PDF never leaves your browser.
🔒 100% browser-based — your PDF never leaves your device
💡 How it works: PDF compression re-encodes embedded images at reduced quality. Text, vector graphics, and document structure are preserved perfectly. Results vary — image-heavy PDFs compress most; text-only PDFs show minimal reduction.
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💡 Recommendation: Medium compression reduces most image-heavy PDFs by 40–70% with no visible quality loss when viewing on screen. Use Low if the PDF contains fine-detail images like medical scans or architectural drawings.
Most oversized PDFs contain high-resolution images embedded at 300 dpi or higher — far beyond what screens display. A PDF from a scanner or design application may embed 3000×4000px images on every page. Compression re-encodes those images at screen-appropriate quality (72–150 dpi equivalent) without changing the document structure.
Will compression change the appearance of my PDF?
At Low and Medium settings, compression is generally invisible on screen — the difference is only apparent when printing at large format. At High and Maximum settings, image quality visibly degrades, particularly in photographs and detailed illustrations. Text is always sharp regardless of compression level because it is stored as vectors, not pixels.
Why didn't my PDF get smaller?
If your PDF contains mostly text and vector graphics (no embedded images), there is little to compress. A 10-page text document may only reduce by 5–15% because the text data is already efficiently stored. For significant compression results, your PDF needs to contain embedded raster images (photos, scans).