Compress PDF
Reduce PDF file size with private browser compression.
Drop one PDF here, or click below to compress it.
100% secure · GDPR Compliant
Today's Activity
Up to 90%
PDF size reduction possible
100%
On-device compression
Free
No account required
Start in 3 easy steps
A quick visual tour of the private PurePDF workflow.
Upload your PDF
Drop the large PDF you want to shrink.
Choose compression
Select a quality level or custom reduction target.
Export optimized file
Queue the compressed PDF in the download hub.
Designed for private PDF work
Fast, clear, and built around local browser processing.
Local compression
Ghostscript runs in your browser so sensitive files stay private.
Choose the savings
Pick light, balanced, extreme, or a custom compression target.
Download ready
Optimized PDFs go straight to the download hub with size metadata.
Try our complete PDF toolkit
Every PurePDF tool, organized by what you need to do.
Frequently
Asked
Questions
Quick answers about this PurePDF workflow.
Is the PDF compressor really free?
Yes. PurePDF Compress PDF is 100% free with no account required, no watermarks, and no file limits for standard use.
Do my files get uploaded to a server?
No. Compression runs entirely in your browser using WebAssembly. Your PDF never leaves your device.
How much can I reduce my PDF file size?
Typically 40–90% depending on content. Image-heavy PDFs compress the most. Text-only PDFs compress less but still see meaningful reductions.
Can I compress a PDF without losing quality?
Yes. Use the "High Quality" or "Balanced" compression level to reduce file size while keeping text sharp and images visually clean.
Can I compress a PDF to under 1MB for email?
Yes. Use the "Extreme" compression level or set a custom percentage target to reach your desired file size, including under 1MB.
What is the maximum file size I can compress?
The free tier supports files up to 10MB. Pro ($7.99/mo) supports up to 100MB for larger documents.
Can I use this on my phone or tablet?
Yes. PurePDF works on any modern mobile browser including Chrome and Safari on iOS and Android.
Is this GDPR compliant?
Yes. Because your file never leaves your browser, there is no data transfer to any server — making it fully GDPR compliant by design.
Does compression affect the PDF text or fonts?
No. Text and fonts remain fully intact. Compression primarily targets embedded images and document metadata.
Can I compress multiple PDFs at once?
The free tool processes one PDF at a time. Batch compression is available on the Pro plan.