Document compare

Track every revision.

Upload two Word documents and see exactly what was added, removed, or changed between drafts.

Original document
Drag and drop, or click to browse
Word documents (.docx) — up to 20 MB
Edited document
Drag and drop, or click to browse
Word documents (.docx) — up to 20 MB
Reading… Documents stay in your browser — never uploaded
Comparison results Document
No text content found
This document appears to be empty or contains only images. We can only compare text content in Word documents.
Change 1 of 1
These documents are identical
No text differences found. Every word and paragraph break matches between the two documents.
Explain these revisions in plain English
Pro summarises what your editor changed. "Three paragraphs in the introduction were rewritten, the second-page conclusion was tightened, and the citation list was expanded."
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How does document comparison work?

ChangeChecks lets you compare Word documents online for free — no Microsoft 365 subscription, no account, no upload. Drop in two .docx files (drafts, proposals, briefs) and we extract the text from each and show every difference between them. The merged view reads like Track Changes, with numbered markers and a summary bar that tells you how many regions changed before you read anything.

Word's built-in Compare feature requires you to open both documents, find the menu, and learn the diff conventions. ChangeChecks gives you the same answer in seconds, in any browser, on any operating system. That is useful when you are reviewing client redlines without their approval to install Office, when you are on a Chromebook, or when the original Track Changes record was lost in a save-as round trip.

Everything runs in your browser, so privileged drafts and confidential proposals stay on your device. If you have ever needed to compare two Word documents to find every change a collaborator made, this gives you the answer without the round trip.

Frequently asked questions

Are my Word documents uploaded?

No. Both files are read in your browser; nothing is sent to a server.

Which formats are supported?

Modern .docx files. Older .doc files need to be saved as .docx first; Word can do this in one click.

Will it preserve formatting and Track Changes?

No. We compare the extracted text only — formatting, comments, and existing Track Changes are not surfaced in the diff.

What if the documents have very different structures?

It still works, but reorganisations get noisy. The tool aligns paragraphs intelligently; major moves may appear as a series of removed plus added paragraphs.

Can I download the result?

Not yet. PDF export is on the Pro roadmap.

Learn more

How to compare two Word documents online
Step-by-step: drop the files, read the summary, walk every change.
For legal teams
Track every clause change in a revised contract.
For writers and editors
See exactly what your editor changed without wading through markup.