Your Documents, Your Device
Your files never leave your browser. All processing happens locally — no uploads, no servers.
Security by Architecture, Not Promise
Security by architecture — your data physically cannot reach our servers.
Client-Side Processing
Every PDF tool runs entirely in your browser using WebAssembly. Your files are never uploaded to any server — they never leave your device.
Zero Data Collection
We don't collect, store, or transmit your file data. No file metadata, no processing logs, no analytics on your documents. What happens in your browser stays in your browser.
No File Uploads
Unlike iLovePDF, Smallpdf, and other competitors that require uploading your files to their servers, PDFly processes everything locally. Your sensitive documents remain completely private.
No Session Tracking
We don't track which tools you use, what files you process, or how long you spend on each task. Your activity is invisible to us by design.
Four Layers of Protection
Independent layers ensure your data stays private at every level.
Browser Sandbox
All processing runs inside your browser's security sandbox, which isolates our code from the rest of your system. This prevents any unauthorized access to your files or device.
WebAssembly Execution
PDF processing is handled by compiled WebAssembly modules that run at near-native speed within the browser sandbox. No external calls are made during processing.
No Network Requests
Once the page loads, no network requests are made during file processing. You can verify this by opening your browser's Network tab in DevTools while using any tool.
Memory-Only Processing
Files are loaded into your browser's memory for processing and are discarded when you close the tab. Nothing is written to disk, cached, or persisted in any way.
PDFly vs. Server-Based Tools
Why client-side processing is fundamentally more secure than server uploads.
PDFly
Client-Side- Files processed in your browser
- No file uploads to any server
- Works offline after page load
- No file size limits or caps
- No tracking or analytics on files
Server-Based Tools
Server-Side- Files uploaded to remote servers
- Files stored on server temporarily
- Requires internet connection
- File size limits and daily caps
- Usage tracking and analytics
Verify It Yourself
You don't have to take our word for it. Open your browser's Developer Tools (F12), go to the Network tab, and use any PDFly tool. You'll see zero network requests during file processing — confirming that everything happens locally in your browser.
Process PDFs with Complete Confidence
Your documents never leave your device. Try PDFly's 55+ free tools today — no signup, no uploads, no risk.