Compare PDFs
Find differences between two PDFs
About this tool
Spot what changed between two versions of a document by comparing their text side by side. Useful for tracking contract edits, reviewing revisions, or confirming a file matches the original — all without leaving your browser.
Three simple steps
How Compare PDFs works
Upload 2 PDFs
Original + revised
Auto-diff
Find text changes
Review
Side-by-side
Built for you
Why use PDFLabz?
100% Private
Files never leave your browser.
Free, no signup
Unlimited use, no account.
No watermarks
Clean, untouched output.
Works everywhere
PC, Mac, phone, tablet — all browsers.
FAQ
Frequently asked questions
What does it actually compare?
Text content. Visual layout differences (images, formatting) require manual review.
Is Compare PDFs really free?
Yes — every tool on PDFLabz is free with no daily limit, no account, and no watermark.
Are my files private?
100%. This tool runs entirely in your browser using JavaScript. Your files never reach our servers.
Is there a file size limit?
Up to 100 MB per file. Larger files just take longer because everything runs locally on your device.
Do I need to install anything?
No installation. Any modern browser (Chrome, Firefox, Safari, Edge) on any OS works.
Privacy first
This tool runs entirely in your browser. Your file never reaches our servers.