How to Compress PDFs Securely and Offline Without Uploading to Servers
Learn how to compress PDF files 100% privately and offline using WebAssembly, without uploading sensitive documents to cloud servers.
## 1. The Hidden Risks of Cloud-Based PDF Compressors The vast majority of free online PDF compression tools require uploading your files to third-party remote servers. While this might seem harmless for general documents, it poses a severe vulnerability when handling legal contracts, financial statements, medical records, payroll sheets, or government-issued IDs. Once an upload occurs, you lose direct control over data retention policies, server-side encryption standards, and potential breach exposure. ## 2. How Client-Side WebAssembly Compression Works Thanks to modern web technologies like