PDF Compressor — Reduce PDF File Size Free Online
Compress PDF files and reduce their size by up to 70%. Choose your compression level, see exact before/after savings, and download instantly — 100% free, no signup.
Why Choose Our Secure PDF Compressor?
AllCloudTools provides a completely secure, client-side PDF compressor. Your document is processed entirely in your web browser, which means it is never sent to any server.
100% Secure & Private
Your files never touch a cloud server. Compression happens 100% locally.
Before/After Savings
Choose your quality setting and see the exact file size savings immediately.
High-Speed Processing
Uses advanced client-side processing for instant optimization.
How to Compress PDF Files in 3 Steps
Upload Document
Select a PDF file from your local disk or drag it directly into the upload dropzone to begin.
Select Preset
Choose between Maximum, Balanced, or Minimal compression settings.
Compress & Save
Click 'Compress PDF' and download your optimized document instantly.
Frequently Asked Questions
Results vary by content. PDFs with many high-resolution images can shrink by 50–70% on Maximum compression. Text-heavy PDFs may only reduce by 10–20%.
On Balanced and Minimal settings, quality loss is barely noticeable. Maximum compression significantly reduces image resolution — best for screen viewing, not printing.
Yes. Files are processed in memory on our servers and never stored or shared. All data is permanently deleted immediately after your download.
You can compress PDF files up to 100 MB in size.
If your PDF contains mostly text or is already optimised, there is limited room to compress further. Compression has the greatest impact on PDFs with embedded high-resolution images.