Compare Text
Compare text side by side: paste two versions and see every addition and deletion, word by word or line by line.
Differences
Paste two versions above to see what changed.
About
Compare Text and Spot Every Change
When you compare text by eye, small changes slip past: a dropped “not”, a changed number, a moved comma. This text comparison tool finds them all, using the same kind of algorithm as professional version-control software.
Paste two drafts to compare two texts in seconds. To see just the size of an edit, try the word count comparison tool, and to make bulk changes, use find and replace.
Guide
How to Use the Compare Text
Paste the original version in the left box and the changed version in the right box.
Choose how to compare: Words for prose, Lines for lists, code, or data, and Characters for spotting typos.
Switch between Side by side and Inline views. Removed text is struck through in red, and added text is underlined in blue.
Use Ignore case or Ignore whitespace to hide changes that don’t matter, such as extra spaces or capitalization.
Features
Key Features
Word, line, or character diff
A word diff for prose, a line-by-line text diff for code and data, and character mode for tiny typos.
Side by side or inline
Read both versions in parallel, or see the changes woven into one flowing text.
Similarity score
Counts added and removed words or lines, plus how much of the text stayed the same.
Private by design
An online diff tool that never uploads your text, so it’s safe for contracts and manuscripts.
Use cases
Who It’s For
Writers and editors
Compare two documents after an edit round to review every change before accepting it.
Legal and business
Find the difference between two texts in contract drafts, policies, and proposals.
Data and code
Compare two lists line by line to see which items were added or dropped.
Is this diff checker private?
Yes. The comparison runs entirely in your browser, which makes it safe for contracts, manuscripts, and other confidential documents.
Which text compare mode should I use?
Words suits essays, articles, and emails. Lines works best for code, lists, spreadsheets, and poems, where each line is a unit. Characters finds single-letter typos and punctuation changes.
What does “Unchanged” mean?
It’s the share of the longer text that appears in both versions, measured in characters. 100% means the texts are identical, and a low number means most of it was rewritten.
Why does it say the texts are too different?
When two texts share very little, a word-by-word comparison produces thousands of tiny changes that aren’t useful to read. Switch to comparing by lines for a clearer overview.