How does PDF compression work?

PDF compression re-renders each page at an optimized resolution and image quality, then rebuilds the document. This significantly reduces file size, especially for PDFs with high-resolution images.

Will compression reduce the quality of my PDF?

It depends on the compression level. 'Low' compression maintains nearly original quality while still reducing size. 'High' compression produces the smallest files but with some visible quality reduction. Use 'Custom' mode for fine control.

What is the maximum file size I can compress?

You can compress PDF files up to 100MB. Files under 10MB are processed entirely in your browser for maximum privacy.

Is my PDF uploaded to a server?

No. The compression happens entirely in your browser using JavaScript. Your file never leaves your device.

Can I compress password-protected PDFs?

No. Password-protected PDFs need to be unlocked first. Use our Unlock PDF tool to remove the password, then compress the resulting file.

PDF Worker

Compress PDF

Reduce your PDF file size while maintaining quality. Choose from preset compression levels or fine-tune with custom settings.

Drop your PDF file here, or click to browse

Supports PDF files up to 100MB

Max file size: 100 MB