🗜️ Compress PDF
Reduce PDF file size by re-rendering pages as optimized images. Choose compression level for the best quality-size balance.
Click to upload or drag & drop a PDF file
Your file never leaves your device
📖 How PDF Compression Works
This tool reduces PDF file size by rendering each page to a canvas using pdf.js, then re-encoding the canvas as a compressed JPEG image at the selected quality level. A new PDF is created with each page as a compressed image using pdf-lib.
This approach works especially well for scanned documents and PDFs with many images. Text-only PDFs may also see reduction since all content is rasterized. The trade-off is that text is no longer selectable in the output.
❓ Frequently Asked Questions
Since this tool rasterizes pages, text becomes part of the image. At Low or Medium compression, text remains very readable. At High or Extreme, you may notice some blurriness.
Yes! All compression happens in your browser using JavaScript. Your PDF file never leaves your device.
Low: Best for documents you'll print. Medium: Best for email/sharing. High: Best for archiving or web. Extreme: Smallest files but noticeable quality loss.
📖 What Is PDF Compression?
PDF compression reduces the file size of PDF documents by optimizing embedded images, removing redundant data, and streamlining the file structure. This is essential for email attachments (many servers limit to 10-25MB), faster upload/downloads, reduced storage costs, and meeting file size requirements for online submissions.
Our compressor balances quality and size reduction, processing everything locally in your browser. Sensitive financial reports, legal documents, and medical records are never transmitted externally.
🚀 How to Use This Tool
- Upload the PDF you want to compress
- Select compression level (low, medium, high)
- Preview the size reduction
- Download the optimized PDF
💡 Tips & Best Practices
Size Tip: Most PDFs with images can be reduced by 50-80%. Text-only PDFs are already small. For email attachments, aim for under 10MB. Higher compression may reduce image quality — use medium for the best balance.