PDF Compressor

Reduce PDF file size while maintaining quality. Free and secure.

PDF Compressor

Reduce PDF file size without losing quality

Privacy First: All compression happens in your browser. Your files never leave your device.

How to Compress a PDF File

1. Upload your PDF

Upload the PDF you want to reduce. The tool shows the original file size. Large PDFs are often caused by embedded high-resolution images — these compress very well.

2. Choose compression level

High compression gives the smallest file but may reduce image quality. Low compression preserves quality with a modest size reduction. For text-only PDFs, all levels look identical.

3. Download the compressed PDF

Download the smaller PDF. The document structure, text, and links are preserved. All processing happens in your browser — your PDF is never uploaded to a server.

What Makes PDFs Large?

Embedded high-res images
Scanned documents and image-heavy PDFs are the most compressible. A 300 DPI scanned page can be reduced to 150 DPI for screen viewing with a huge size reduction.
Unoptimised fonts
PDFs embed font files. Multiple large fonts (especially CJK fonts) add significant size. Font subsetting reduces this.
Redundant metadata
PDFs can contain extensive metadata, preview thumbnails, and revision history that adds size without visual content.
High-quality exports
PDFs exported from design tools like InDesign or Illustrator at "print quality" settings are often 5–10× larger than necessary for screen use.

PDF Size Limits by Platform

Platform / Use CaseSize LimitNotes
Gmail attachment25 MBLarger files must use Google Drive link
Outlook attachment20 MB (Microsoft 365)Varies by org policy
WhatsApp document100 MBPDF sent as document file
LinkedIn (resume)5 MBProfile resume upload limit
Indeed (resume)5 MBJob application attachment
UK visa application6 MB per documentUKVI document upload portal
FAQ

PDF Compressor