Drop two contract drafts above to see a clause-level redline
Compare Contracts Online — See Every Clause Change
Upload the original contract and the counterparty’s version and see every clause they added, deleted, or reworded — highlighted instantly. A private contract comparison tool that redlines PDF and DOCX agreements entirely in your browser, so your NDAs, MSAs, and client documents never leave your device. Included in Pro — €9.99/mo.
How to compare contracts
- Upload the original contract (PDF or DOCX).
- Upload the counterparty's marked-up version.
- Every clause change, added term, and deleted word is highlighted immediately.
Key features
- PDF and DOCX contract comparison in one tool
- Clause-level change highlighting — additions, deletions, and substitutions
- Page images tab: a pixel-level visual diff of each rendered PDF page, so changes to signatures, stamps, and layout show up even when the text is identical
- No files sent to any server — architecturally private
- Unlocks with Pro — €9.99/mo
Common uses
- Compare the original draft against the counterparty's markup clause by clause
- Review NDA amendments and see every added or removed term before signing
- Track changes across multiple negotiation rounds of a service or licensing agreement
- Confirm a "final" contract matches exactly what was negotiated before you sign
- Redline a supplier or vendor agreement without emailing it to a third-party service
Frequently asked questions
How do I compare two contracts online?
Upload the original contract and the revised version — both PDF and DOCX are supported. Compare Files extracts the text locally and highlights every clause addition, deletion, and wording change inline, so you can see exactly what the counterparty edited in seconds instead of reading the whole agreement line by line.
Are my contracts kept confidential?
Yes. All contract comparison happens entirely in your browser — no files are uploaded to any server, ever. Your NDAs, lease agreements, and client documents never leave your device, so there is no data-breach risk and no need for a data processing agreement.
Can I see a visual, page-by-page comparison too?
Yes. Alongside the clause redline there is a Page images tab that renders each PDF page and shows a pixel-level diff, so you can catch a swapped signature block, an added stamp, or a reformatted page even when the underlying text is identical. Visual page diffs are available for PDFs; DOCX comparison is text-based.
How is this different from Word's built-in Compare feature?
Word's compare only works when both files are DOCX and produces a tracked-changes document you still have to read through. Compare Files highlights every addition, deletion, and modification inline — and it works on PDFs too, so you can catch redlines even when opposing counsel sends a PDF instead of a Word file.
What does contract comparison cost?
PDF and DOCX contract comparison is included in Pro — €9.99/mo, with no per-document fees. Plain text pasted directly is always free, with no usage limits.
No AI means no hallucinations
Compare Files uses a deterministic, logic-based engine — not a language model. It reports every change that is actually in your files, and never invents one.
Your files never leave your device. Everything runs in your browser — no uploads, nothing stored.
No AI, so no hallucinations. A deterministic engine reports every real change and never invents one.
No upload, no server wait. Comparisons run locally and keep working offline once the page has loaded.