Scanned Document Compressor
Shrink heavy scanned PDFs to easily shareable sizes. 100% private, offline processing.
Drag & drop multiple files
or browse files
Supports: .pdf
Max 20 files, 50MB each
Optimize Scans for Email and Portals
Scanned homework, contracts, textbooks, and multi-page forms are notoriously large and difficult to email or upload. Our Scanned Document Compressor specifically targets the high-resolution image layers created by desktop and mobile scanner apps (like CamScanner, Adobe Scan, or flatbed scanners). It reduces the DPI and compresses the image streams while ensuring your signatures, stamps, and handwritten notes remain perfectly legible.
Frequently Asked Questions
Why are scanned PDFs so large?
When you scan a document, the scanner typically takes a high-resolution photograph of each page. These high-DPI images are embedded directly into the PDF, leading to massive file sizes, often exceeding 10MB for just a few pages.
How does this tool compress scanned documents?
Our tool intelligently downsamples the embedded high-resolution images within the PDF while applying advanced stream compression. It finds the optimal balance between reducing DPI to save space and maintaining sufficient contrast so the text remains easy to read.
Is it safe to compress confidential scanned contracts?
Yes, absolutely. Unlike online converters that require you to upload your sensitive files to a server, CompressKaro processes your scanned PDFs entirely within your web browser using WebAssembly. Your documents never leave your computer.