Compress PDF files online for free with our secure PDF compressor. Reduce file size up to 90% while maintaining quality. No upload required - all processing happens in your browser.
Click to upload or drag and drop
PDF files only
Lower = smaller file, but lower quality
Lower = more compression, but lower quality
Click 'Choose File' and select the PDF document you want to compress from your device. The file will be loaded locally in your browser.
Use the scale factor slider (0.1-1.0) to control page size and the image quality slider (0.1-1.0) to balance compression vs. quality. Lower values = smaller file size.
Click 'Compress PDF' to start the compression process. The tool will process each page and show you a real-time preview of both original and compressed versions.
Review the file size reduction percentage and download your compressed PDF using the 'Download Compressed PDF' button. The file is ready to use immediately.
Control compression with customizable scale factor (0.1-1.0) and image quality settings to balance file size and visual quality
Achieve up to 90% file size reduction with smart compression algorithms that optimize images and content
All processing happens locally in your browser - no server uploads, ensuring complete privacy and security
Compare original and compressed PDFs side-by-side with built-in preview functionality before downloading
PDF compression is the process of reducing the file size of PDF documents by optimizing images, removing redundant data, and applying compression algorithms. Our online PDF compressor converts each page to optimized JPEG images and rebuilds the PDF with smaller file sizes while preserving readability. This process is particularly effective for PDFs containing images, scanned documents, or graphics-heavy content.
Your PDFs never leave your device. All compression happens locally in your browser using advanced JavaScript libraries, ensuring your sensitive documents remain private and secure.
Compress as many PDFs as you need without registration, subscriptions, or hidden fees. No watermarks or usage restrictions.
Instant compression without waiting for server processing or file uploads. Results are available immediately after processing.
Fine-tune compression settings to achieve the perfect balance between file size and document quality for your specific needs.
Yes, our PDF compressor is completely safe because your files never leave your browser. All processing happens locally on your device using client-side JavaScript, ensuring your documents remain private and secure.
File size reduction varies depending on the original content, but typically ranges from 50-90%. PDFs with many images or graphics see the most significant size reduction, while text-heavy documents may see smaller reductions.
Our tool allows you to control the quality-to-size ratio. You can adjust the scale factor (0.1-1.0) and image quality settings to find the perfect balance between file size and visual quality for your needs.
No, there are no artificial file size limits. The tool processes PDFs entirely in your browser, so the only limitation is your device's available memory.
No installation required. The PDF compressor runs entirely in your web browser using modern JavaScript libraries like PDF-lib and PDF.js.