PDF Compressor
Free PDF Compressor — Reduce PDF File Size Online
Compress any PDF file and reduce its size entirely in your browser using PDF-lib. Choose from 3 compression levels. The compressor removes duplicate objects, unused resources and redundant metadata while keeping all content intact. See a side-by-side size comparison before downloading.
When PDF Compression Helps Most
PDF compression works best on files with many embedded images, scanned documents, presentation exports and reports with graphics. Text-only PDFs are already compact and may see minimal reduction. For maximum compression of image-heavy PDFs, consider also converting images inside the PDF to WebP or JPEG format before creating the PDF.
Frequently Asked Questions
How much can a PDF be compressed?
Results vary by PDF content. PDFs with many embedded images can reduce 20-60%. Text-only PDFs may see 5-15% reduction as text is already compact. The compressor removes duplicate objects and unused resources.
What is the difference between Screen, eBook and Printer?
Screen produces the smallest file size suitable for on-screen viewing and email. eBook gives a balanced quality-to-size ratio good for most uses. Printer preserves higher quality suitable for printing but results in a larger file.
Will the PDF content change after compression?
No. All pages, text, images and formatting remain intact. Only internal duplicate objects and unused metadata are removed during compression.
Is my PDF uploaded to a server?
No. All compression happens entirely in your browser using PDF-lib. Your files never leave your device — completely private and secure.