Text Diff Checker
Text Diff Checker
Compare two versions of a text line by line. Lines only in the second text are green, lines removed from the first are red. Nothing leaves your browser.
When a document passes through several hands — an editor, a client, a colleague, a new version of a contract — the important question is simple: what actually changed? Reading two versions side by side and hunting for differences is slow, and the human eye is remarkably good at missing a single altered word in a familiar paragraph. A diff checker answers the question mechanically, line by line, so nothing slips past.
Paste the original into the first box and the revised version into the second. The comparison matches up the lines the two texts share and presents one combined view: lines that exist only in the new version appear in green with a plus sign, lines that were removed appear in red with a minus, and unchanged lines sit plainly between them. A summary tells you at a glance how many lines were added, removed, and left alone — identical texts say so plainly instead of showing a wall of plain lines.
The comparison works on whole lines, which suits documents, articles, lists, and code. A line where one word changed will show as one removed line plus one added line, which still points you at exactly the right place. For very large texts the tool may ask you to compare in sections — that limit protects your browser from a comparison table too big to build comfortably.
Both texts are compared locally in your browser and are never uploaded.
How to use
- Paste the original version of the text into the first box.
- Paste the changed version into the second box.
- Click Compare Texts.
- Read the combined result: green lines were added, red lines were removed, plain lines are unchanged.
- Use the summary counts to judge whether the edit was small or substantial.
Frequently asked questions
Why does a small edit show a whole line removed and added?
This checker compares complete lines, not individual words. If one word in a line changes, the old line counts as removed and the new line as added. That keeps the result fast and readable; the pair of lines sits together so you can spot the changed word yourself.
Does blank space matter?
Yes — lines must match exactly, including spaces at the start or end. A paragraph that only gained a trailing space will appear as changed. If you suspect invisible differences, that behaviour is actually useful: it reveals them.
Can I compare code with it?
Yes. Line-based comparison is exactly how programmers review changes. Indentation differences are treated as real differences, which is what you usually want in code.
Is my text private?
Completely. The diff is computed in your browser on this page. Neither text is sent anywhere or stored.