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Text Diff

Text

Free online text diff tool. Compare two text blocks side by side and see added, removed, and unchanged lines highlighted. No signup required.

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How to use the Text Diff

Getting started with Text Diff is straightforward: paste your text and the tool instantly processes it. All logic runs in your browser, keeping your content completely private. No hidden server calls.

Why use the Text Diff

Text Diff is the quickest way to process text without compromising privacy. Everything runs in your browser — your content never touches a server.

When to use Text Diff

Use Text Diff when you have text from multiple sources (emails, documents, web pages) pasted together and need to normalise spacing, line breaks, and formatting into a single consistent style before you put it into a report or a presentation deck.

Key features of Text Diff

Text Diff processes text entirely in your browser for speed and privacy. There are no file size limits, the output preserves your original formatting where applicable, and the clean interface means you focus on your content rather than navigating tool clutter. Paste, transform, copy — it takes seconds.

Common use cases for Text Diff

Typical use cases for Text Diff: a writer normalises line spacing and removes extra whitespace from a document copied from an email before publishing; an editor counts words in a draft to verify it fits a publication limit; a translator converts text case to match style guide requirements across multilingual content.

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Quick answers for Text Diff

How does the Text Diff tool compare my text?
It splits both inputs into lines and runs a longest-common-subsequence diff. Lines that match are shown unchanged, lines only in the original are marked as removed (−), and lines only in the changed text are marked as added (+).
Can it diff more than just plain text?
Yes - anything you can paste in. Code, JSON, logs, configuration files, or commit messages all work. The line-based view is what most code review tools use, so it should look familiar.
Does the diff highlight inline word changes?
Not currently. The Text Diff tool works at the line level. If you want to see what changed within a single line, paste the two versions on their own lines and the result will show them side by side.
Is my text uploaded anywhere?
No. The diff is computed entirely in your browser, so even sensitive code, contracts, or logs stay on your machine.
Why are some lines counted as changed when only whitespace differs?
A line with different whitespace is technically a different line. To ignore those differences, normalize whitespace before pasting (or trim trailing spaces in your editor) and run the diff again.