Is PDF compression lossless?

The smart-rebuild mode is lossless. The JPEG re-encode mode is much smaller but can soften text and images.

No — the file is processed entirely in your browser.

How much can I compress a PDF?

Savings depend on content; scanned PDFs often shrink 60–90% with JPEG re-encoding.

Reduce el tamaño del PDF reconstruyendo el documento y re-codificando imágenes. Compresión honesta del lado del cliente, sin subida.

Drop a PDF or buscar archivos

Comprimirion method

JPEG quality: 72%