Compress PDF
Shrink your PDF file size with adjustable compression.
Drop PDF file here or click to browse
PDF file, no size limit
How It Works
Upload PDF
Select or drag-and-drop your PDF file
Choose Level
Select low, medium, or high compression
Download
Get your compressed PDF with size comparison
Frequently Asked Questions
How does PDF compression work?
Low compression re-saves the PDF to remove redundant data. Medium and high compression re-render each page as a JPEG image at different quality levels and rebuild the PDF, achieving significant size reduction.
Will compression reduce the quality of my PDF?
Low compression preserves original quality. Medium offers a good balance between quality and file size. High compression produces the smallest files but with reduced image quality.
How much smaller will my PDF be?
It depends on the content. PDFs with large images typically see 50-80% reduction at high compression. Text-heavy PDFs may see 10-30% reduction.
Is this safe to use?
Yes. ArmorPDF processes everything in your browser using JavaScript. Your files never leave your device and are never uploaded to any server.
Can I compress a large PDF file?
Yes, there is no file size limit. Large files may take longer to process since everything runs in your browser.
Does this work on mobile devices?
Yes. ArmorPDF works in any modern browser on any device, including iPhones, iPads, and Android phones.