Swift Compressor
Professional local optimization for multiple PDF files
Secure local processing · Zero server lag
Privacy Safe
Military-grade local processing. No data logs or server storage.
Turbo Engine
Optimized for multi-core hardware. Fast processing of large files.
Smart Shrink
Advanced object stream optimization reduces size by up to 90%.
Compress PDF Files Online — Free & Secure
Shrink the size of your PDF files without losing readability or vector structure. Fast and secure local processing ensures your files never leave your device.
How to Compress a PDF Online?
Step-by-step optimization guide
Upload PDF
Select or drag & drop your PDF file into our compressor workspace. The file loads instantly in your browser.
Auto-Optimize Layout
The compressor scans and optimizes internal object streams, metadata, and cross-reference streams locally.
Download Compressed File
Click 'Compress PDF' to run. Instantly download your optimized, smaller PDF to your local drive.
In-Browser PDF Compression Features
Fast browser-based operations without queues or subscriptions. Tailor files instantly and secure privacy.
No Server Access
Your PDF is processed inside your browser tab. Zero data uploads, zero security concerns.
Stream Optimization
Removes duplicate structures and formats object layout streams to reduce weight.
Preserves Font Vectors
Preserves text vector layouts and font embeddings perfectly for crisp readability.
Optimize PDF Sister
Easily adjust compression settings for visual-heavy documents using our sister tool.
Frequently Asked Questions
Compress PDF FAQs
How can I reduce my PDF file size online?
Simply upload your PDF file to our tool. The tool runs an optimization algorithm locally in your web browser. Once finished, click 'Download PDF' to save your compressed file.
Are my files uploaded to any servers during compression?
No! All compression and optimization occur entirely on your own device using WebAssembly. Your files are never uploaded to any remote servers, offering 100% privacy.
Will the text or image quality be reduced after compression?
Our smart compressor reduces file sizes by removing duplicate metadata and optimizing PDF internal object streams, preserving vector graphics and text quality cleanly. For extreme image compression, you can use our Optimize PDF tool.
What is the maximum file size I can compress?
Since compression is done locally in your browser tab, there is no server limit on file sizes. It relies purely on your device's memory, allowing you to process large files smoothly.