Is Online PDF Compression Safe?

It depends on which tool you use.

The Risk: Server-Side Processing

Most online compressors upload your files to their servers:

• Documents travel over the internet
• Company could read or store your files
• Data breaches could expose documents

The Safe Way: Client-Side Processing

Tools like FreeConversion use client-side processing — files are compressed in your browser and never leave your device.

How to verify:

• Compression works offline (turn off WiFi)
• No "uploading" progress bar
• Check network requests in browser dev tools

Red Flags

• Tools requiring account creation
• Excessive ads and pop-ups
• Long "upload" times
• Vague privacy policies

Best Practices

• Use client-side tools for confidential documents
• Never compress sensitive info on unknown websites

What About HTTPS?

Even with HTTPS encryption, server-side tools still receive your unencrypted files on their servers. HTTPS only protects data in transit.