Compress PDF Online Free (Reduce PDF Size Privately)
Shrink PDF file size while keeping sharp quality. Free, fast in-browser compression with complete file privacy.
How to Compress PDF
Upload Your PDF
Select the PDF file you want to reduce in size for emailing or uploading.
Choose Compression Level
Select your preferred quality-to-size ratio from the available compression options.
Download Compressed PDF
Click Compress and download your optimized, smaller PDF file instantly.
Compress PDF file size without losing quality
If your PDF is too large to email or upload, our compressor can shrink its size significantly. It optimizes images and streams within the PDF while maintaining maximum visual quality. You can choose different compression levels depending on your needs.
Since all optimization is done locally on your machine using JavaScript and WebAssembly, there are no upload queues or delays. It's fast, private, and has no size restrictions.
Frequently Asked Questions
How does Compress PDF process my PDF?
Compress PDF uses advanced browser-based algorithms to analyze and optimize your PDF structure. The processing happens entirely locally using JavaScript and WebAssembly for fast, private results.
Is it safe to use Compress PDF with confidential documents?
Absolutely. Compress PDF processes everything locally inside your web browser using JavaScript and WebAssembly. Your files are never uploaded to any external server. Sensitive documents, contracts, and personal files remain completely private on your device.
Is Compress PDF really free? Are there hidden limits?
Yes, Compress PDF is 100% free with no hidden costs. There are no file size limits, no daily usage caps, no watermarks on your output, and no account registration required. Use it as many times as you need.
Will compression reduce the visual quality?
You can choose from different compression levels. Lower compression preserves more visual quality, while higher compression produces smaller files. The tool optimizes intelligently to minimize quality loss.