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.
Your file never leaves your computer: everything is processed in the browser, nothing is uploaded.
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 never uploaded
The document is processed inside your browser and never uploaded. You can see it yourself on the Network tab of the developer tools. We retain nothing.
Works without the internet
Once the page has loaded, no connection is needed. Turn off the network and process a file — the tool keeps working. That is the simplest way to see the document goes nowhere.
No registration 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.