Find out what actually changed between two PDFs
Contracts get redlined, reports get revised, and forms get resubmitted — and it's rarely obvious what actually changed between one PDF and the next just by eyeballing them side by side. DocZap's Compare PDF tool reads the text from both files and highlights every addition and removal, so you can review a revision in seconds instead of re-reading the whole document.
Built for content changes, not pixel differences
This tool compares the actual text inside each PDF rather than the rendered appearance of the page, which makes it well suited to catching the changes that matter most — an edited clause in a contract, a changed number in a report, a deleted paragraph in a policy document. It's not designed to flag purely visual differences like a shifted logo or a different font.
Everything happens in your browser tab
Both files are read using pdf.js, and the comparison itself runs with a JavaScript diff algorithm, all locally on your device. Neither PDF is ever uploaded anywhere, which matters given how often the documents worth comparing — contracts, financial statements, legal filings — are exactly the kind you don't want passing through an unfamiliar server.
Once you've reviewed the differences, DocZap's Redact PDF or Watermark PDF tools below are useful next steps before sharing the finished document.