As of 13 August 2026, AI can compare two versions of a document.
This still needs a person who signs their name to it.
Can you do it?
5 minutesto a draft.
15 minutesto something you’d act on.
Cost, all in£0
Skill needednone
Who has to check ityou
What the alternative costsThe supplied tool list gives no price for a human or software alternative to document comparison.
If this goes wrong: a change is missed or described incorrectly, and you can rerun the comparison and check the source files before relying on it.
What to actually do
Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Do it yourself
Second choiceA chat interface, no skill needed, and roughly 15 minutes until you can act on the result.
How to actually do it
- Open a chatbot that accepts file uploads, and keep both document versions available on your device.
- Name the files clearly as the older version and the newer version, then remove private information that is not needed for the comparison.
- Attach both files, or paste their complete text into the prompt using the DOCUMENT A and DOCUMENT B labels.
- Ask the chatbot to separate added, removed and changed text, and to flag changes to numbers, dates, names, links, tables and formatting.
- Open both original documents side by side and check every important item in the chatbot's list against the source wording.
- Search the originals for numbers, dates, names and headings that the chatbot flagged, then save or copy the checked comparison for your records.
Prompt
Compare DOCUMENT A and DOCUMENT B below. Treat DOCUMENT A as the older version and DOCUMENT B as the newer version. Produce four sections: 1. Added text, 2. Removed text, 3. Changed text, showing the old wording and new wording together, and 4. Changes to headings, tables, numbers, dates, names, links, and formatting that may affect meaning. Preserve the exact wording for every important change. Do not infer that a change is harmless, do not invent missing text, and do not report a difference unless it appears in the supplied documents. If either document is incomplete, scanned, badly extracted or difficult to read, say which part could not be compared. End with a short list of items I should check directly in the original files. DOCUMENT A: [PASTE OR ATTACH THE OLDER VERSION] DOCUMENT B: [PASTE OR ATTACH THE NEWER VERSION]
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
Use a tool built for this
The distant third
What it gets wrong
- It can miss changes in scanned pages, images, text boxes, footnotes, tracked changes or complicated tables.
- It cannot decide whether a wording change alters your rights, obligations or practical meaning without the relevant context.
- It does not reliably judge whether formatting changes are intentional, significant or legally important.
- It cannot compare content that you have not supplied, including linked files, previous versions or hidden document metadata.
- It may summarise a real change instead of preserving the exact wording, so important differences still need checking in the originals.
Even on a YES, the friction has a name: context depth, judgement under ambiguity and verification cost.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 2 |
| Verification | 2 |
| Liability | 2 |
| Effort delta | 2 |
| Total | 10 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT compare two documents?
- Yes. Upload both documents, label the older and newer versions, and ask for added, removed and changed text, but check important results against the originals.
- How do I compare two versions of a document with AI?
- Give the AI both complete versions and ask it to preserve the exact old and new wording for each important change. Check numbers, dates, names, tables and formatting directly in the files.
- Can AI find every change between two documents?
- No tool should be assumed to find every change, especially in scans, images, footnotes, tables or complex formatting. Use the result as a comparison aid and inspect both documents yourself.
- Is it safe to upload private documents to AI?
- Only upload documents to a service whose privacy and retention terms you understand, and redact information that is not needed. Do not upload confidential material if you cannot accept the service processing it.
Nearby answers
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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