Compare two PDF files online free — find differences
Upload two PDF, DOCX or TXT documents and get a precise line-by-line diff. Added, deleted and changed lines are highlighted. Processed locally, no AI.
Three steps — done
The entire process takes under a minute. No software to install, no account required.
Upload two documents
Upload Document 1 (original) and Document 2 (revised version). PDF, DOCX and TXT are supported.
Automatic comparison
Click "Compare documents" — the algorithm compares texts line by line and identifies every difference.
Review the results
You get: a similarity score, added lines (green), deleted lines (red), changed lines (yellow) and a unified diff.
Secure, fast, free
The principles we uphold for every tool.
Files deleted immediately
Documents are removed from the server as soon as results are downloaded. We retain nothing.
No external APIs
Processing happens on our server — your files are never sent to OpenAI, Google or Amazon.
No sign-up required
No account, email or password needed. Upload a file and get results instantly.
Works on any device
Fully responsive for phones and tablets — runs entirely in the browser.
Frequently asked questions
Answers to common questions about security, formats and limitations.