Compare two texts

After you click Compare, the tool shows one combined view:

• Green marks text that was added in the changed version.
• Red with strikethrough marks text that was removed.
• Everything else is unchanged.

Above it you see the totals, for example +12 added −7 removed (words). If nothing changed, the tool tells you the two texts are identical.

Moved text has no special marking: a sentence that moved to another place shows up as removed in one spot and added in another.

Mode	Best for
Line	Code, lists, config files, CSV data, poems
Word	Essays, articles, contracts, emails
Character	Short strings: names, IDs, URLs, typos

In line mode, each line is shown on its own row with a + or − sign, much like a code diff. Word mode treats words, spaces and punctuation marks as separate pieces, so a changed comma doesn't mark the whole word. Character mode finds the smallest changes, such as a single swapped letter in a product code; for very long texts it's limited and the tool will ask you to use word or line mode instead.

The comparison uses the Myers diff algorithm, the same approach used by Git and many other diff tools, which finds the smallest set of additions and removals that turns one text into the other.

Original: The meeting is on Monday at 10 a.m. in Room 4.

Changed: The meeting is on Tuesday at 10:30 a.m. in Room 4B.

In word mode, Monday is shown as removed and Tuesday as added. The time shows 10 kept, with : and 30 added, because the tool splits numbers and punctuation into separate pieces. 4 is removed and 4B added, since 4B is a single word. In character mode, you'd see just Mon → Tues, :30 added and B added, which is the most precise view for short texts.

Pick the mode that matches how you want to review: words for reading, characters for hunting down tiny changes.

• Ignore whitespace. Differences in spaces, tabs and line-end spacing don't count. Useful when one version was reformatted or copied from a PDF.
• Ignore case. Apple and apple are treated as equal.
• Swap exchanges the two sides, so additions become removals and vice versa.

The texts are compared in your browser and are never uploaded, so you can safely compare contracts, code and private documents.

• Contracts and agreements: see exactly what the other side changed in a new draft.
• Editing: compare your draft with the editor's version, or a translation with an updated source.
• Code and configuration: spot the changed line in two versions of a config file.
• Data: compare two exports of a list line by line. For unordered lists, compare two lists is better, because it ignores order.
• Plagiarism and copy checks: see how closely a text follows a source.

Tip: when comparing text from PDFs, first fix broken lines with remove line breaks on both versions, so differences in line wrapping don't hide the real changes.