Compress PDF

Shrink PDF files in your browser. Choose lossless optimisation or re-render pages at a lower quality.

PDF file

Compression level

JPEG quality (re-render modes)

Remove document metadata (title, author, producer, dates)

Convert pages to grayscale (re-render modes)

How it works

Choose Lossless to rebuild the PDF structure, drop unused objects and strip web metadata — no visible quality change.
The other levels re-render every page (150, 110 or 80 DPI) and rebuild the PDF with JPEG compression, which gives the biggest savings on scanned or image-heavy files. Selectable text is lost in those modes.
Your file never leaves your device: everything runs in this tab with pdf.js and pdf-lib.
Already-compressed PDFs with little image content may only shrink a few percent — that is normal.