- Upload: Drag and drop or click to upload a PDF file.
- Compress: Click 'Compress PDF' — the file is re-structured using object streams and metadata is stripped.
- Compare: See original vs compressed file size with percentage reduction.
- Download: Save the compressed PDF.
PDF Compressor — Reduce PDF File Size in Your Browser
Our PDF Compressor uses pdf-lib to restructure and optimize PDF files entirely in your browser. It reduces file size through lossless techniques — no quality loss, no uploads.
How Compression Works
The compressor applies several optimization techniques:
- Object streams: Consolidates PDF objects into compressed streams
- Metadata removal: Strips title, author, subject, keywords, producer, and creator metadata
- Structure optimization: Rebuilds the PDF cross-reference table for optimal size
What Gets Removed
- Document metadata (title, author, subject, keywords)
- Producer and creator information
- Redundant object definitions
What Stays Intact
- All text content
- Images and graphics
- Fonts and formatting
- Bookmarks and links
- Form fields
Common Use Cases
- Email attachments: Reduce PDF size to fit email limits
- Web uploads: Optimize PDFs for website or portal uploads
- Storage: Save disk space with smaller PDF files
- Sharing: Faster downloads for recipients
Privacy
All processing happens locally in your browser. No PDF data is transmitted to any server.