How PDF Compression Works in Your Browser
This tool uses pdf-lib to re-save your PDF with optimised stream compression, removing unused objects and internal metadata. This can reduce many PDFs by 20–60% without any quality loss for text-based documents.
Which Compression Level Should I Choose?
- Low — removes metadata, minimal compression. Best for documents you need to print at full quality.
- Medium — uses object streams for better compression. Good balance for email attachments.
- High — maximum stream compression. Best for web sharing or storage where file size is critical.
Tips for Smaller PDFs
- Text-only PDFs compress the most effectively
- If your PDF has large images, consider saving from the source application at a lower image quality
- After compressing, also try our Split PDF tool to break large documents into smaller parts