Compress / optimize PDF online
Quick answer: Scanto can re-save a PDF with optimized object streams. For photo-based scans, the strongest size reduction is usually Scan to PDF at lower JPEG quality.
Privacy-first: processing stays on your device.
Frequently asked questions
How do I get the smallest scan PDF?
Photograph or export pages as images, then use Scan to PDF with quality around 60-75%.
Will optimize reduce every PDF a lot?
Text-heavy PDFs may shrink only slightly. Image-heavy scans benefit more from the image workflow.
Is compress PDF free?
Yes, with no account required.
Also free: Mind Map Online — create mind maps with no login.