ExactPDF Security: How We Protect Your Documents

Our Security Promise

At ExactPDF, security isn't an afterthought - it's the foundation of everything we build. This post explains exactly how we protect your documents and why you can trust us with your files.

The Core Principle: 100% Local Processing

Your files never leave your device. This single fact eliminates most security risks:

No data breaches - We can't leak what we never receive

No server hacks - There's nothing to hack

No employee access - Nobody at ExactPDF can see your files

No government requests - We have no data to hand over

How It Works

When you use ExactPDF:

JavaScript runs in your browser - All PDF processing happens client-side

Files stay local - Loaded from your device, processed in memory

Results download directly - Saved back to your device

We use trusted open-source libraries:

pdf-lib - PDF manipulation (MIT license)

pdfjs-dist - PDF rendering (Apache 2.0)

Tesseract.js - OCR processing (Apache 2.0)

Security Measures We Implement

1. Security Headers

Every page includes protective headers:

Header	Purpose
Content-Security-Policy	Prevents XSS attacks
X-Frame-Options: DENY	Blocks clickjacking
X-Content-Type-Options	Prevents MIME sniffing
Referrer-Policy	Limits referrer data
Permissions-Policy	Restricts browser features

2. Input Validation

For the few server-side features (like Office-to-PDF conversion):

File type verification - Only allowed extensions

Size limits - Prevents resource exhaustion

Filename sanitization - Blocks path traversal

Rate limiting - Stops abuse

3. No User Accounts

We don't have:

Login systems

Password databases

Personal data storage

Payment information

Nothing to steal = nothing to worry about.

4. Regular Security Audits

We regularly review:

npm dependencies for vulnerabilities

Code for security anti-patterns

API endpoints for abuse vectors

Browser compatibility and security

Verify It Yourself

Don't take our word for it. Here's how to verify our claims:

Test 1: Network Monitor

Open Developer Tools (F12)

Go to the Network tab

Process any PDF

Result: Zero file uploads

Test 2: Offline Mode

Disconnect from the internet

Try any PDF tool

Result: It still works

Test 3: Source Inspection

View page source

Check for tracking scripts

Result: No Google Analytics, no Facebook Pixel, no tracking

What About the Office-to-PDF API?

This is our only server-side feature because LibreOffice can't run in browsers. Here's how we protect it:

Temporary files only - Deleted immediately after conversion

No logging of content - We log errors, not your data

Rate limited - 5 requests per minute per IP

Sandboxed execution - Isolated from other processes

Common Questions

Q: Do you use cookies?

A: Only essential cookies for language preferences. No tracking.

Q: Can you see my PDFs?

A: No. We literally cannot. They never reach our servers.

Q: What about the "Buy me a coffee" links?

A: External links open in new tabs. No file data is shared.

Q: Is ExactPDF open source?

A: We use open-source libraries and are transparent about our practices. The codebase itself is proprietary but auditable.

Our Commitment

Privacy by design - Not an opt-in feature, built into the core

Minimal footprint - We collect only what's necessary (nothing)

Transparency - This blog post is proof of our openness

Continuous improvement - Regular security reviews and updates

Conclusion

Security isn't about marketing claims - it's about architecture. ExactPDF's local-first design means your documents are protected by the strongest security measure possible: they never leave your control.

Have questions about our security practices? We're happy to discuss them.

Try ExactPDF - 100% Private PDF Tools