PDF Compressor – Reduce PDF File Size Online Free
Choose from 3 compression levels to shrink your PDF. No uploads — all processing is local in your browser. Download your smaller PDF in seconds.
Click, or drop your files here
Multiple content formats supported
Guide
How to Use
Upload Your PDF
Click or drag to upload your PDF file (up to 100MB).
Choose Compression Level
Select Low (lossless), Medium (balanced), or High (maximum size reduction).
Compress & Download
Click 'Compress PDF' and download your smaller optimized file.
Benefits
Why Use Our Tool?
3 Compression Levels
Low (lossless metadata strip), Medium (re-rendered at 72% quality), High (maximum compression).
Email-Ready Size
Quickly reduce PDFs to fit email attachment limits of 25MB.
Zero Uploads
All processing is local. Your file stays on your device.
Fast Processing
Most PDFs compress in just a few seconds.
FAQ
Frequently Asked Questions
What's the difference between Low, Medium, and High compression?
Low strips metadata only — no visual change, lossless. Medium re-renders pages as images at 72% JPEG quality. High applies maximum compression at 45% JPEG quality for the smallest file size.
Will High compression make my PDF blurry?
High compression converts pages to images, which reduces visual quality. Use Low compression for documents you need to read or edit clearly.
Can I compress a PDF for email attachment?
Yes. Use Medium or High compression to reduce below typical 25MB email attachment limits.
Does compressed PDF still have selectable text?
Low compression preserves text selection. Medium and High output is image-only — text will not be selectable.
What is the maximum file size?
Up to 100MB PDFs are supported.
Is my PDF sent anywhere?
No. All compression runs in your browser using pdf-lib and PDF.js. Your file never leaves your device.