How do I see what changed between two versions of a contract?
Paste both versions into an AI tool and ask what changed and whether anything moves against you. It returns a short diff in seconds instead of a twenty-minute re-read — for example, payment terms shifting from 30 to 15 days, a new late-fee clause, or a total that quietly rose four percent.
How to do it
- Gather both versions of the documentHave last month's contract and this month's renewal ready as text or PDF. You need both to compare, not just the newest one.
- Paste them into your AI tool, labeled old and newDrop both versions into the same prompt and clearly mark which is the previous version and which is the update, so the tool knows the direction of the change.
- Ask one comparison questionUse a single prompt: “Here are two versions of a contract, old and new. What changed, and does anything move against me?” This focuses it on differences, not a summary.
- Check the flagged changes against your interestsRead the diff for shifted deadlines, added clauses, and moved numbers — payment terms, fees, totals, auto-renewal — and note anything that favors the other party.
- Verify anything material in the original textBefore signing, confirm the important changes against the actual contract wording. Treat the AI diff as a fast first pass that tells you where to look.
Questions that come up
Does this work for PDFs and scanned contracts?
Most AI tools read text-based PDFs directly, so you can attach or paste both files. Scanned images or photos need to be run through OCR first, or the tool will only see a picture and miss the wording. Convert them to selectable text before comparing.
Can I trust the AI to catch every change?
Treat it as a fast first pass, not the final word. It reliably surfaces shifted numbers, dates, and added clauses, but it can miss subtle wording or misread ambiguous phrasing. Verify anything material — fees, deadlines, liability — against the original contract before you sign.
What if the two versions are formatted differently?
It still works, because the tool compares meaning rather than layout. Even if paragraphs are reordered or numbering changes, it can match clauses by content. If formatting is very messy, tell it which document is old and which is new so the direction of each change stays clear.
Full transcript
Drop both contract versions into your AI and ask what changed. Old and new, side by side, one question: anything move against me? Instead of re-reading the whole thing to catch the clause that shifted. It answers in three lines: terms went thirty to fifteen days, a late fee appeared, the total rose four percent. Next renewal that lands, diff it before you sign.