Compress PDF
Reduce PDF file size by stripping redundant metadata and optimizing object streams.
Your PDF is processed locally in your browser.
PDFSimplify processes documents on your device using client-side WebAssembly and Web Workers. No document data is transmitted to our servers or external cloud services during processing.
Drop your PDF here to compress
Genuine client-side optimization with zero server upload
No file size limit imposed by server • Processed locally in your browserHow Compress PDF Works in Your Browser
Reconstructs the PDF object catalog into a clean document container in client browser memory, strips redundant metadata streams, and compacts cross-reference tables locally using modern Flate compression.
Why client-side processing is more private:
Unlike conventional online converters, your documents never traverse external networks to third-party processing servers. Everything happens inside your local machine’s memory.
How to Use Compress PDF
Upload PDF
Select the file you want to compress.
Choose Mode
Pick Basic, Balanced, or Strong compression.
Download
View size savings and save the optimized PDF.
Key Features
Helpful Tips
- •Documents with bloated metadata or multiple revisions see significant size reduction.
Troubleshooting & Notes
- •Already compressed text-only files will show honest zero-reduction notices rather than fake reduction.
Frequently Asked Questions
Will compression degrade readability?↓
No. Our Balanced mode focuses on structural compaction and metadata stripping without rasterizing text layers.
What if my file is already compressed?↓
PDFSimplify honestly notifies you if the file cannot be shrunk further and allows you to keep the original without alteration.
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Related Guides & Articles
How to Compress a PDF and Reduce File Size in Your Browser
Techniques for shrinking bloated PDF documents by stripping orphan objects and optimizing internal streams.
How to Visually Organize, Reorder, and Delete PDF Pages
A practical guide to rearranging pages, deleting unwanted sheets, and fixing document flow using a visual grid.