How to Verify Our Privacy Claims
We claim your files never leave your device. Don't just trust us—verify it yourself. Here are three ways to prove we're telling the truth.
Trust, But Verify
Any website can claim "we don't upload your files." The difference? We give you the tools to verify this yourself. No technical expertise required—just 5 minutes of your time.
Check Network Traffic (5 minutes)
The most reliable way to verify no uploads occur
Step-by-Step Instructions
- Step 1:
Open Utilioo in your browser
Visit utilioo.com in Chrome, Firefox, or Edge
- Step 2:
Open Developer Tools
Press F12 (Windows/Linux) or Cmd+Option+I (Mac)
Or right-click anywhere → "Inspect" → "Network" tab
- Step 3:
Go to the Network tab
Click the "Network" tab at the top of DevTools
- Step 4:
Clear all network requests
Click the 🚫 icon (clear) to start with a clean slate
- Step 5:
Drop your PDF files
Drag and drop 2-3 PDF files into Utilioo
- Step 6:
Click "Merge PDFs"
Watch the Network tab as the merge happens
- Step 7:
Verify: ZERO file uploads
What you SHOULD see:
- ✓ No POST requests to external servers
- ✓ No file data being transmitted
- ✓ Only GET requests for page assets (CSS, JS)
- ✓ Analytics ping (Google Analytics page view only)
What you should NOT see:
- ✗ POST requests with large payloads
- ✗ Requests to /api/upload or similar endpoints
- ✗ File data in request headers/body
- ✗ Uploads to AWS, Google Cloud, or other cloud services
💡 Pro Tip:
Look at the "Size" column in the Network tab. If you see large uploads (matching your PDF file sizes), that's a red flag. With Utilioo, you'll only see small requests (kilobytes, not megabytes).
Use Completely Offline (1 minute)
The simplest proof—if it works offline, no uploads are possible
Offline Test Instructions
- Step 1:
Visit Utilioo.com once
Load the page normally with internet connected
- Step 2:
Disconnect from the internet completely
Turn off Wi-Fi, unplug ethernet, or enable Airplane Mode
Make sure you're actually offline—try opening google.com to verify
- Step 3:
Merge PDFs in Utilioo
Drop files, click merge, download result
- Step 4:
It works! 🎉
If Utilioo works offline, it's mathematically impossible for files to upload.
No internet connection = no uploads. This is the simplest and most definitive proof.
Why This Works:
After your first visit, Utilioo's code is cached in your browser (Progressive Web App). All PDF processing happens locally using JavaScript. No server connection needed!
Technical Deep Dive (For Developers)
Understand exactly how Utilioo works under the hood
Architecture Overview
Frontend Stack:
- ✓Next.js 14: React framework (all code runs in browser)
- ✓pdf-lib: Open-source PDF manipulation library (GitHub)
- ✓Web Workers: Multi-threaded processing for performance
- ✓IndexedDB: Local browser storage (not sent to servers)
Backend Architecture:
We don't have one for PDF processing.
Our backend only handles:
- • Payment processing (Stripe)
- • Usage tracking (merge count only, not file data)
- • Analytics (Google Analytics page views)
Zero PDF files ever touch our servers.
How PDF Merging Works:
- 1. File Selection: User selects files via HTML file input (local file system access only)
- 2. Read Files: JavaScript FileReader API reads files into browser memory (ArrayBuffer)
- 3. Parse PDFs: pdf-lib parses each PDF structure in-memory
- 4. Merge: pdf-lib combines all pages into a new PDF document
- 5. Download: Browser's download API saves merged PDF to user's device
At no point in this process does data leave the browser sandbox.
Independent Security Audit
We're currently working with independent security researchers to audit our application. Results will be published here when complete.
Interested in auditing Utilioo? Contact us: write@digiwares.xyz
Frequently Asked Questions
Why should I trust you?
You shouldn't blindly trust anyone. That's why we give you the tools to verify our claims yourself. Follow the steps above—they take less than 5 minutes and provide definitive proof.
Why not just open-source everything?
Great question! While we believe in transparency, open-sourcing our entire codebase would allow competitors to clone Utilioo in hours. Instead, we use open-source libraries (pdf-lib, Next.js) that are already audited by thousands of developers, and we provide multiple ways for you to verify our privacy claims independently.
What about Google Analytics?
Yes, we use Google Analytics to track page views and user behavior (which pages you visit, how long you stay, etc.). However, we explicitly DO NOT send:
- • Your PDF file names
- • File contents
- • File metadata
- • Number of files merged
Only anonymous page views are tracked. No file data whatsoever.
Can you access my files from your end?
No. It's technically impossible. Your files are processed entirely in your browser's memory (RAM). They never transmit to our servers, so we have no way to access them—even if we wanted to (we don't).
What if I don't trust browser verification?
Then use Method 2: the offline test. If Utilioo works with zero internet connection, it's mathematically impossible for uploads to occur. This is the simplest and most definitive proof.
Convinced? Try Utilioo Risk-Free
Now that you know your files never leave your device, merge PDFs with complete confidence.