When you use online tools to convert PDFs, compress images, or edit files, where does the actual processing happen? The answer has significant implications for your privacy and data security.
Server-Side vs. Client-Side Processing
Server-Side Processing
Most online tools work by uploading your files to their servers:
- You select a file on your computer
- The file uploads to a remote server
- The server processes your file
- You download the result
The problem: Your files exist on someone else's computer, even temporarily.
Client-Side Processing
Tools with client-side processing work differently:
- You select a file on your computer
- Your browser processes the file locally
- The result is ready instantly
The benefit: Your files never leave your device.
Why This Matters
🔒 Data Breaches
When files are uploaded to servers, they become potential targets. Even "deleted" files may exist in backups or logs. With client-side processing, there's nothing to breach.
📋 Compliance
For businesses handling sensitive data (medical records, legal documents, financial information), uploading files to unknown servers may violate HIPAA, GDPR, or other regulations.
🚫 No Data Mining
Some "free" services analyze uploaded files for data mining. When processing happens locally, your content remains private.
⚡ Speed
Client-side processing is often faster because there's no upload/download wait time. The processing starts immediately.
How to Identify Client-Side Tools
Look for these indicators:
- ✅ Works offline after initial page load
- ✅ No progress bar for "uploading"
- ✅ Instant processing of large files
- ✅ Privacy policy states "files never leave your device"
XCT Labs: Privacy by Design
All tools on XCT Labs use client-side processing. When you compress a PDF or convert an image, your browser does all the work using JavaScript. Our servers never see your files.
This isn't just a feature—it's a fundamental design choice. We believe your files are your business, not ours.
🛡️ Try Our Private Tools
All XCT Labs tools process files in your browser. Your data stays with you.
Explore Tools →