Free Text Diff Tool – Compare Two Texts and Highlight Differences Online
Text comparison is a fundamental task in writing, programming, and content management. Whether you are reviewing changes to a document, comparing code versions, or verifying that edits were applied correctly, a reliable diff tool saves time and prevents errors.
Our free text diff tool uses a Longest Common Subsequence (LCS) algorithm to compute the minimal set of changes between two texts. Lines present only in the original appear in red (removed), lines present only in the modified version appear in green (added), and unchanged lines are shown normally for context.
Unlike many online diff tools that require file uploads or account creation, our tool works entirely in your browser. Paste your two texts side by side, and the differences are highlighted instantly. No data is transmitted to any server, making it safe for comparing sensitive documents, contracts, or proprietary code.
The tool provides summary statistics showing how many lines were added, removed, and left unchanged. This gives you a quick overview of how much a text has been modified, which is especially useful for reviewing large documents or tracking revisions over time.