How to compare two texts and save a clear difference report.

Open Text Compare. Under Original text, choose Write or paste text and enter the earlier announcement. Put the revised announcement in Updated text. The original says the workshop starts on Monday and asks attendees to bring a pencil; the update changes the day to Thursday, changes the pencil to a laptop and adds a line about coffee.

You can instead use Upload text file or drop a file onto each card. Imports accept UTF-8 TXT, CSV, JSON, XML, HTML and Markdown, up to 1 MB per source. These formats are read as text. Swap texts reverses the original and updated roles, so use it only when those roles are wrong.

ORIGINAL
The workshop starts on Monday.
Bring a notebook and a pencil.

UPDATED
The workshop starts on Thursday.
Bring a notebook and a laptop.
Coffee is included.

For this prose example, leave Compare by set to Words and keep both ignore checkboxes off. Select Compare texts. The tool compares words, spacing and punctuation; it does not judge whether the new wording is better.

Use Lines for a list or text-based code, and Characters to inspect small changes. Ignore letter case can hide capitalization-only changes. Ignore extra whitespace treats a whitespace run within a comparison unit as one space, but Lines still uses line boundaries. These choices affect the match and similarity score, so record them when sharing a report.

Compare by

Words

Ignore letter case

Off

Ignore extra whitespace

Off

The real downloaded example reports 79.2% similarity, two change groups, five added words and two removed words. The day change is one group. The pencil replacement and adjacent coffee addition form the second group; a change group is not necessarily one edited word.

Side by side keeps both versions visible with red removals and green additions. Unified combines the diff into one flow. Changes only focuses on the changed groups. Use the previous and next controls to move between them.

Similarity is twice the matched comparison units divided by the total units in both versions. Because whitespace and punctuation are units too, it is not simply the percentage of unchanged words. It also does not measure meaning, correctness or plagiarism.

Select HTML report under Report and use the download icon. The example saves as i2text-comparison.html. It contains the statistics, settings, highlighted sources and a change register. Open this file in a browser to review it independently of the tool.

Choose Text report for a plain-text record or JSON data for structured settings, segments and statistics. Both complete sources are included. The print icon opens a report for printing; choose Save as PDF in the browser dialog if needed. Copy summary copies the measurements rather than producing a merged final draft.

The comparison runs locally in your browser. Save the report before refreshing or closing the page. For a very large or substantially different section, read any broad-comparison notice and split the sources into smaller sections if you need finer detail.