Find every change without reading twice
Two versions of the same text look identical until you find the one sentence that changed. Reading them side by side is slow and you can easily miss a deleted “not” or a new number. Text compare does it for you: the text that was added is highlighted, the text that was removed is marked, and the rest stays plain.
It is useful whenever someone sends back a document “with a few small changes”: a contract clause the other side edited, a policy that was updated, a translation that was revised, an essay your teacher corrected, a product description a colleague rewrote, or a configuration file that stopped working after an edit. You also see how many parts changed in total.
By words or by lines
Comparing by words is best for prose: paragraphs, letters, articles and contracts. It shows exactly which words changed inside a sentence, so a corrected date or a new adjective stands out.
Comparing by lines is best for lists, data and code, where each line is a unit: a list of names, a column of prices, a CSV exported twice, or a block of settings. A line that changed is shown as removed in its old form and added in its new form.
Ignore what doesn't matter
Not every difference is a real change. Text copied from a PDF or an email often comes with extra spaces, and a heading may have been rewritten in capitals. Turn on “ignore spaces” so double spaces and spacing at the ends of lines don't count, and “ignore case” so “Total” and “TOTAL” count as the same word. What remains are the changes in content.
If both versions are Word documents or PDFs, copy the text of each one into the boxes. For PDFs there is also “Compare PDF”, which compares the files page by page.
Your texts are not sent anywhere
The comparison runs in your browser. Neither text is sent to a server or saved, so you can compare contracts, internal documents or unpublished work without worrying about where they end up. It is free, with no account and no limit, on a phone or a computer.
Students use it to see exactly what a tutor corrected, writers to review an editor's suggestions, freelancers to check what a client changed in a brief, and developers to spot the one line that differs between two settings files.
When you are done, you can count the words of the final version with “Word counter” or clean it up with “Case converter”.