Text Diff Checker
Compare two versions of text
Turn two drafts into one crystal-clear story of every word and punctuation mark that changed.
One click turns two drafts into a precise, color-coded map of every change.
How to compare two texts
- Paste the original version into Old text.
- Paste the revised version into New text.
- Choose whether capitalization matters, then select Compare.
- Green marks additions; red strikethrough marks removals.
For example, comparing “I love reading books” with “I really love reading great books” produces two additions: “really” and “great”. The remaining words stay visible as context.
When is a text comparison useful?
- Compare drafts of an article, book review or chapter after editing.
- Audit what an AI-edited version added or removed.
- Review transcripts, subtitles, emails, terms or meeting notes.
- Help students inspect changes between two revisions.
The diff map gives every review a faster start: jump straight to changed wording, then spend your attention choosing the strongest version.
Frequently asked questions
What is a text diff?
A text diff finds the smallest edit script that turns the old text into the new text. Unchanged content remains visible so every change keeps its context.
How is “modified” text displayed?
A modification becomes an intuitive color pair: old wording in red and new wording in green in the same area. You see the full transformation instead of a generic label.
Does it compare lines or words?
The tool tokenizes words, whitespace and punctuation, then runs a Myers diff. Small changes inside a sentence are therefore highlighted more precisely than a line-only diff.
How quickly does the result appear?
In one click. The algorithm instantly builds a color map of additions, removals and unchanged context.