Compress PDF
Reduce PDF document file size in your browser without uploading to external servers. Choose between structural or balanced image compression presets.
Drop your PDF file here
or browse to select a document to compress
Select one file · Processed 100% locally
How to Use Compress PDF
Upload PDF
Choose the document you wish to compress.
Choose Preset
Select Low (lossless structural cleanup), Recommended (balanced 150 DPI), or High (maximum compact).
Download
View the exact reduction percentage and download your optimized document.
Capabilities & Features
- •Low, Recommended, and High compression presets
- •Honest size reduction reporting (no fabricated savings)
- •Lossless structural object stream optimization
- •Downsamples oversized embedded raster imagery when needed
Important Notes & Limitations
- •PDFs that already contain heavily compressed images or only vector text may experience modest reduction.
Client-Side Privacy Guarantee
When using Compress PDF, your files, extracted text, and document metadata are processed exclusively inside your browser using client-side JavaScript, WebAssembly, and native Web Crypto APIs. Your document data is never sent to our servers or any cloud service. Once you close this tab or click clear, volatile memory is automatically released.
Frequently Asked Questions
How does local compression work?
It cleans redundant PDF objects and compresses embedded raster graphics using client-side canvas re-encoding.
Why did my file size decrease only slightly?
If your PDF already has optimized streams and minimal bitmap images, there is no redundant data to remove. We never display fake savings.
Explore More PDF Tools
All utilities run 100% locally in your browser.