Text Diff

The Text Diff tool lets you compare text side by side and highlights exactly what changed, line by line — additions in one color, deletions in another, unchanged lines left as-is. It's the fastest way to spot differences between two versions of a document, config file, contract clause or code snippet without reading both end to end.

Common scenarios: comparing two drafts of a legal contract to see exactly which clauses and dollar figures changed, running a text comparison between a config file before and after a deployment to confirm only the intended lines moved, catching an accidental extra space or reordered line in a code review, or checking that an edited essay didn't lose a sentence during a rewrite. Paste the original on one side and the modified version on the other; the diff renders instantly.

Unlike command-line diff tools, there's nothing to install and no terminal syntax to remember — the side-by-side, color-coded layout makes changes obvious at a glance, even for people who've never used a diff checker before. Very large documents are processed progressively so the page stays responsive rather than freezing on a multi-thousand-line comparison, and the whole comparison runs locally in your browser, which matters when the two documents are confidential — an unreleased contract, proprietary source code or an internal report.

A couple of things to know before comparing: the diff is line-based, so moving a paragraph to a different part of the document shows up as a deletion in the old location and an addition in the new one rather than a single 'moved' marker. It's also whitespace-sensitive, so trailing spaces or different line-ending styles between the two versions can show lines as changed even when the visible text is identical — trim or normalize whitespace first if that's not what you want to see.