Your Files Never Leave Your Browser
PDFb2 is fundamentally different from other PDF tools. We process everything locally on your device using client-side JavaScript. No uploads. No cloud servers. No one else can see your files.
How Client-Side Processing Works
1. Select Your File
Choose a PDF from your device. The file is read directly by your browser's JavaScript engine — it never leaves your computer.
2. Process Locally
Your browser runs the processing code (compress, merge, sign, etc.) using JavaScript libraries. No data is sent to any server.
3. Download Result
The processed file is generated in your browser and saved directly to your device. At no point does any file travel over the internet.
What We Never Do
Upload your files to our servers
We have no file upload endpoint. There is no server to receive your documents.
Store or cache your documents
We cannot store what we never receive. Your files exist only in your browser memory.
Read or analyze your content
We have zero access to your file contents. Processing runs entirely in your browser.
Share data with third parties
No file data is transmitted anywhere. Not to us, not to advertisers, not to anyone.
PDFb2 vs. Cloud-Based PDF Tools
| Feature | PDFb2 | Cloud PDF Tools |
|---|---|---|
| File processing location | Your browser | Their servers |
| Files uploaded to cloud | Never | Always |
| Works offline (after page load) | Yes | No |
| Third-party access to files | Impossible | Possible |
| Compliant for sensitive docs | Yes | Depends on provider |
| Speed (no upload/download) | Instant | Depends on connection |
Built for Professionals Who Handle Sensitive Documents
Legal
Contracts, NDAs, court filings, and privileged communications. Attorney-client privilege demands documents stay on your device.
Finance
Tax returns, financial statements, investment documents. Regulatory compliance requires keeping sensitive financial data private.
Healthcare
Patient records, medical forms, insurance documents. HIPAA considerations mean your files should never touch a third-party server.
Technical Details
What technology powers the PDF processing?
PDFb2 uses pdf-lib (for PDF manipulation), pdfjs (for rendering), and other JavaScript libraries that run entirely in your browser. These are the same open-source libraries used by many desktop applications.
What network requests does PDFb2 make?
PDFb2 loads the web page and its JavaScript code from our CDN. After that, the only network requests are for authentication (when you sign in) and analytics. Your PDF files are never part of any network request.
Can I verify this myself?
Yes! Open your browser's Developer Tools (F12), go to the Network tab, and process a PDF. You'll see that no file data is transmitted. The only requests are for page assets, authentication, and analytics.
Does it work offline?
Once the page is loaded, most processing features work without an internet connection. You need connectivity only to load the page initially and for account-related features.
Try It — 3 Free Downloads, No Sign-Up
Process your first PDF and see for yourself. No account needed.