How to compare two documents for differences
Whether you're checking what an editor changed, verifying a contract revision, or comparing two drafts of your own writing, reading side by side is slow and error-prone. Here are four reliable ways to see exactly what changed between two documents — including one that runs entirely in your browser.
Microsoft Word's built-in Compare
Desktop Word has a dedicated feature: Review → Compare → Compare…, pick the original and the revised file, and Word produces a third document with every change shown as tracked revisions. It handles formatting changes as well as text, which makes it thorough but noisy — a font change flags as heavily as a rewritten sentence. Word for the web doesn't include Compare, so you need the desktop app.
Google Docs: version history and the Compare tool
If both versions live in the same Google Doc, File → Version history → See version history shows what changed between saves, color-coded by author. For two separate Docs, Tools → Compare documents merges the differences into a new document as suggested edits. Both need the files uploaded to Google's servers — fine for most work, not ideal for confidential text.
A private, in-browser comparison
For plain text — essays, articles, contract clauses, translations — paste the two versions into the compare tool on this site. It highlights every added and removed word instantly, and the comparison runs entirely in your browser: neither version is uploaded or stored anywhere. This is the fastest option when you have the text on your clipboard and don't need formatting-level detail.
When the changes matter legally
For contracts and other documents where a missed change has consequences, use two methods and cross-check — for example Word's Compare plus a text-level diff. Word-level diffs catch reworded sentences that redline summaries sometimes bury, while Word's Compare catches formatting and footnote edits a plain-text diff can't see.
Which comparison method fits which job
| Word Compare (desktop) | Full .docx revisions incl. formatting; produces a tracked-changes document |
| Google Docs version history | Changes within one document over time, by author |
| Google Docs Compare documents | Two separate Docs; output as suggested edits |
| This site's text compare | Plain text, word-level, instant, nothing uploaded |
| Reading side by side | Last resort — slow and misses small edits |
Compare two texts now — free and private
Can I compare two Word documents without Microsoft Word?
Yes. Copy the text out of each document (or open them in any viewer) and paste both versions into an in-browser compare tool. You lose formatting-level comparison, but every added, removed or reworded passage is highlighted — and nothing is uploaded.
Does comparing text online upload my documents?
It depends on the tool. Google Docs comparison happens on Google's servers. The compare tool on this site runs entirely in your browser with JavaScript — both texts stay on your device, which matters for contracts and unpublished work.
What does word-level comparison miss?
Formatting (bold, fonts, spacing), footnotes, headers, images and table structure. If those matter — legal documents, typeset manuscripts — pair a text diff with Word's Compare, which tracks formatting changes too.