Diff checker
Compare two texts, entirely in your browser.
Add a file and run the tool.
Your file is ready.
Try a different file, or try again.
Settings
Adjust the settings below. The result updates as you go.
Runs fully in your browser. Nothing is uploaded.
Runs fully in your browser. Nothing is uploaded.
How it works
Paste the original text.
Paste the changed version.
Read the highlighted difference.
Frequently asked questions
No. Both texts are compared entirely in your browser.
Line mode is better for comparing whole documents, config files, or code - anything where you care which lines changed. Word mode is better for comparing a paragraph or a sentence, where you want to see exactly which words changed inside a line that's mostly the same.
Each field works best under 200,000 characters. Longer text is accepted, but comparison pauses above that so the tool never freezes your tab.
Yes. Tick Ignore case, Ignore whitespace or Ignore blank lines (blank lines apply to line mode only) and those differences stop counting as changes. The Added, Removed and Unchanged totals update with them.
Guides
A closer look at specific problems this tool solves.
Why You Should Diff Two Texts Instead of Reading Them Side by Side
Two paragraphs that look identical at a glance can differ by one flipped word, one deleted 'not', one changed number. Human eyes are bad at catching exactly that kind of change - a real diff isn't.
Read the guideHow to Compare Two Blocks of Text and See Exactly What Changed
Paste the original, paste the changed version, and the difference highlights live - no click required. Here's the actual process, including what the tool does when two texts turn out to be almost entirely different.
Read the guideLine Diff vs Word Diff: Comparing Config Files and Comparing Paragraphs
A config file and a paragraph of prose need two different kinds of diff. Line mode tells you which lines changed. Word mode tells you which words changed inside a line that's otherwise the same.
Read the guide
Comments