Find every discrepancy between two PDF documents in seconds, not hours.

Upload Document A and Document B, and our PDF comparison tool reads both documents and highlights every difference between them — added, removed and changed content — ranked by severity. There's no need to read line by line: in seconds you get a clean, plain-English summary of exactly what changed between the two versions. Your first PDF comparison is free, with no card required.

Yes — your first full comparison is completely free, no card and no trial sign-up tricks. You upload both documents and get the entire report, including the Critical Issues and Warnings breakdown and the PDF export. After your free comparison, a single affordable monthly subscription covers unlimited comparisons. See Pricing for details.

It does everything a traditional redline or "compare documents" feature does — it shows every difference between two versions of a document — but it goes further. Instead of just marking text as inserted or deleted like a basic document compare, it interprets each change and tells you whether it's a Critical Issue (something that materially shifts meaning, figures or risk) or a lower-priority Warning. So you're not just seeing what changed, you're seeing what matters.

PDF only. Upload two text-based PDFs, or paste the text directly into the box if you prefer. PDFs that are scanned images without selectable text can't be read — they need to be text-based PDFs.

Any two text-based PDF documents: contracts and agreements, reports, policies, invoices, proposals, manuscripts, terms and conditions, and more. If you have an old version and a new version — or two competing drafts — the tool will compare them and surface the differences.

The engine is extremely thorough at catching differences between two documents — far more consistent than a tired human eye scanning dense text. That said, it's designed as a fast first-pass review, not a replacement for professional advice. For anything high-stakes, use the report to focus an expert's time on the parts that actually changed, rather than paying them to re-read the whole document from scratch.

Yes. Files are sent over an encrypted (HTTPS) connection, processed in memory, and never written to disk or a database. Your documents are never stored, never reviewed by a human, and never used to train any algorithm. The text exists only for the few seconds it takes to run the comparison, then it's discarded. See our Security & Privacy page for the full picture.

Nothing — they're never saved. We deliberately store no PDF files and no document text. There is no copy to leak, subpoena or lose. You get your comparison report, and the underlying documents simply cease to exist on our side.

Seconds. A manual side-by-side review of two documents can take a careful reader an hour or more; our engine reads both documents and returns a ranked report of every material difference in well under a minute — then lets you export it as a PDF to share with your team.

One straightforward monthly subscription covers unlimited comparisons — ideal if you review documents regularly. There are no per-document fees and you can cancel anytime from your account. But you can run your first comparison free before deciding. See Pricing.