Compress PDFs Instantly
Reduce file size by up to 90% while keeping your PDFs looking great. No account needed. Your files are 100% private and auto-deleted.
Privacy and file handling
Files are uploaded to our secure servers for compression and are automatically deleted within five minutes.
We do not read or store your files.
We use analytics to improve the site. It does not include your file contents.
Why Choose CrushMyPDF?
Everything you need in a PDF compressor
100% Secure
Your files are processed locally and automatically deleted after 5 minutes. No data is stored.
Lightning Fast
Compress your PDFs in seconds with our advanced compression algorithms.
Works Everywhere
No installation required. Use on Windows, Mac, Linux, iOS, or Android.
Quality Guaranteed
Choose your compression level to balance file size with document quality.
Forever Free
No hidden fees, no premium plans, no account required. Always free.
Easy to Use
Upload, select compression level, download. That's it!
Professional PDF Compression for Everyone
CrushMyPDF is a leading free online tool designed specifically to help you reduce PDF file size without losing document clarity. Whether you're a student submitting college applications, a professional emailing large reports, or just looking to save disk space, our advanced algorithms ensure your documents remain high-quality while being significantly smaller.
We leverage industry-standard compression engines like PyMuPDF and Ghostscript to optimize your files. Unlike other tools, we prioritize your privacy—every file you upload is automatically deleted from our secure servers within 5 minutes. No accounts, no fees, no hassle—just fast, secure compression whenever you need it.
How It Works
Simple 3-step process
Upload PDF
Choose your PDF file (max 15 MB)
Select Level
Pick your compression level
Download
Get your compressed PDF instantly
Tips & Tricks
Frequently Asked Questions
Common questions about our PDF compression tool
Latest from our Blog
PDF Compression Techniques Explained (2026 Guide)
A reference of the main PDF compression techniques used today - image downsampling, font subsetting, stream filtering, object cleanup - and when each one matters.
How PDF Compression Works: A Simple Walkthrough
A clear walkthrough of how a PDF goes from large to small - which parts get rewritten, which get downsampled, and why text usually stays sharp.
What Does Compressing a PDF Actually Do? (Plain English)
Compressing a PDF shrinks the file size so it uploads faster, fits inside email limits, and takes less storage. Here is exactly what changes - and what does not.