# Text Diff Checker Paste two versions of a text and see exactly what changed — added and removed lines, with the edited words highlighted inside each line. Powered by the same diff algorithm as Git, running entirely in your browser. Paste text in both panels to see the differences. ## How the comparison works The checker compares the two texts **line by line** using the Myers diff algorithm — the same approach used by Git and most professional diff tools. It finds the longest common subsequence of lines, so a single inserted paragraph shows up as one addition instead of marking everything after it as changed. When a line was *edited* rather than added or removed, the changed words inside it are highlighted so you can spot a one-word difference in a long sentence at a glance. ### Reading the output Green rows with a **+** exist only in the changed text; red rows with a **−** exist only in the original. A red row immediately followed by a green row is an edit — the brighter highlights inside mark exactly which words differ. With *Collapse unchanged lines* on, long identical stretches fold into a divider so the differences stay in view. ### Options **Ignore case** treats “Hello” and “hello” as identical — useful for case-insensitive formats. **Ignore trailing whitespace** (on by default) stops invisible end-of-line spaces from flagging otherwise identical lines, a classic source of noisy diffs when text has passed through different editors. **Swap sides** reverses the direction of the comparison in one click. ### What it's for Comparing two versions of a contract clause, checking what an editor changed in your draft, verifying a config file against a known-good copy, reviewing AI-revised text against your original, or confirming that two “identical” exports really are identical. If you work with code, your editor's built-in diff is still the right tool — this one is for the quick, no-setup cases. ### Privacy The comparison runs entirely in your browser. Neither text is sent anywhere, saved, or logged — compare confidential drafts freely. --- *Source: [ocxly.com/text-diff.html](https://ocxly.com/text-diff.html) — OCXLY, free 100% client-side privacy-first tools. Free online text diff checker: compare two texts or documents line by line with word-level highlighting, using the same Myers algorithm as Git. Runs entirely in your browser — nothing is uploaded.*