Text diff checker

Inline view merges the change into the flow of one stream, with removed text struck through and added text highlighted. Side-by-side places the two texts in adjacent columns so each original line lines up with its replacement, which is often easier for long structural edits.

Line-level marks entire lines that differ. Word-level runs a secondary diff inside each changed line, so only the actual changed words are struck or highlighted - helpful when a line differs by a single edit.

Yes. The algorithm handles large inputs well, and the result stays in memory until you leave the page. For very large documents you can still use it, but consider narrowing the difference to a section for clarity.

No. The comparison runs entirely in your browser with no network requests. Your text never leaves the page, and nothing is stored or logged.

Yes. Paste the old content and the new content, and the checker will recreate the same added and removed lines you would see in a conventional diff, accounting for whitespace differences via the word view.

Paste both versions into the two editors and the diff highlights every change between them. Switch between line and word granularity, and toggle inline or side-by-side to see the difference the way that is easiest to read for your document.

Use the merged inline view, which streams the comparison vertically so long documents remain readable, and rely on word-level marking when the change is a single spelling difference in an otherwise identical paragraph.

A diff checker is a comparison utility that takes two texts and reports exactly what changed between them - added lines, removed lines, and word-level edits. When used to compare text online you get a precise record instead of eyeballing two documents.

Not by default. Notepad++ needs a plugin like Compare, ComparePlus, or UltraCompare to diff two files; there is no built-in view. This page gives you the same result without installing a plugin, works for any amount of pasted text, and stays fully private in the browser.

Paste the two code versions into the checker and use line-level diff so added and removed statements line up structurally. The side-by-side view is ideal for this because each original line sits next to its replacement.

Text comparison is the process of analyzing two strings or documents to find their differences, usually by matching common lines and words. This page runs a Myers diff algorithm for the sake of the smallest edit script, the same class of algorithm version-control systems use.

ChatGPT can summarize differences, but it estimates rather than precisely diffs, and can describe style and tone as well as content. For exact text comparison - knowing every character that changed - a dedicated diff checker computes the authoritative result locally.

First establish what changed with a diff, then structure your analysis by feature or claim, quoting the exact passages that differ. Your conclusion should explain why the changes matter - with the checker highlighting every edit so nothing is missed when you review.

A diff checker shows you overlapping and changed content, but for a similarity percentage you typically need a plagiarism or text-similarity service. For a quick "did this file change legally?" check, the word- and line-level diff here gives you the concrete answer.

Paste both versions and run the compare. If line-level diff returns no differences, the texts are identical; if the only difference is whitespace or line endings, the word view will confirm that too.