How to Compare Contract Versions

Redlines: trust the file, not the summary

A redline shows the previous draft and the new one merged into a single view: deleted wording struck out, new wording marked. When the counterparty's redline arrives with the new draft, verify it – a redline made with change tracking only contains the edits the author tracked. Comparing the two files directly, with Compare Word Documents for DOCX drafts or Compare PDF for exported versions, reconstructs every difference from the documents themselves. If the redline and the comparison disagree, the comparison is right.

The checklist: what to verify on every changed version

Parties and definitions. Legal entity names, registration details, and the defined terms that other clauses hang on. A changed definition rewrites every clause that uses it.
Amounts and payment terms. Prices, caps, currencies, payment deadlines, late-payment interest. One digit here outweighs pages of boilerplate.
Dates and deadlines. Term of the agreement, renewal and notice windows, delivery milestones. Watch for switches between calendar and business days.
Liability and indemnities. Liability caps, carve-outs from the caps, indemnity scope, insurance requirements. Softening here is the classic quiet edit.
Termination. Who may terminate, on what grounds, with what notice, and what survives termination – confidentiality, accrued payments, IP assignments.
Governing law and disputes. Jurisdiction, arbitration clauses, prevailing-language provisions in bilingual contracts.
The annexes. Statements of work, price lists and specifications change more often than the body and are compared least often. Compare them as files too.

Where the tooling fits

The mechanical pass is free: Compare Word Documents or Compare PDF highlights every addition, removal and edited clause between two versions, so the checklist above is applied to a short list of real changes instead of a whole document. Scanned signed copies become comparable after OCR PDF.

Judgment is where AI earns its keep. Contract Analysis reads the agreement and flags risks, one-sided obligations, missing protections and unusual clauses – the questions a reviewer asks after "what changed" is settled. For agreements that matter, run the changed version through it before signing.

Frequently asked questions

What is a contract redline?

A redline is a version of a contract showing every edit against the previous draft: deletions struck through, insertions marked. The name comes from the red pen lawyers used on paper. A mechanical comparison of the two files produces the same picture without trusting anyone to have tracked their changes.

How do I compare two versions of a contract?

Run both files through a document comparison first – Compare Word Documents for DOCX drafts, Compare PDF for signed or exported versions – then review each highlighted change against the checklist: parties, amounts, dates, liability, termination, governing law.

The counterparty says "only minor edits". Should I still compare?

Always. "Minor edits" is a description of intent, not of the file. A comparison takes two minutes and either confirms the claim or finds what it missed – a changed notice period, a softened obligation, a shifted liability cap.

Can AI review the changes for risks?

Yes. After the mechanical comparison shows what changed, Contract Analysis reads the agreement itself and flags risky clauses, one-sided obligations and missing protections. Comparison answers "what changed"; analysis answers "what it means".