Compare two texts and highlight differences
Compare two texts and highlight differences
Comparison tools differ in granularity. Line-based diff, what
git diff and the Unix
diff utility produce, finds
the longest common subsequence of whole lines and reports added or removed lines. This checker works inline
instead: word-level mode splits both texts on whitespace and pairs tokens left to right, flagging each
mismatch as a change, addition, or deletion, while unchecking it aligns the two strings character by
character for punctuation-level precision.
The ignore case and ignore whitespace options normalize both sides before comparing, which is handy when a copy edit changed capitalization or reflowed paragraphs, but the side-by-side panels always display your original text. After a run, the statistics strip counts additions, deletions, and changes, and the similarity score reports the share of compared tokens that matched exactly.
Because everything runs in your browser, the tool is safe for drafts and private documents. Typical uses include reviewing an editor's changes, verifying a config edit, and confirming whether two exports actually differ. To tidy text first, remove repeated lines with Remove Duplicates, measure the result in the Word Counter, or fix caption timing with the Subtitle Time Adjuster.
Word-level mode splits both texts on whitespace and pairs tokens left to right, which reads naturally for prose and most documents. Unchecking it compares character by character, pinpointing typos and punctuation changes inside otherwise identical words.
It is the share of compared tokens that matched exactly, after any ignore-case or ignore-whitespace normalization is applied. A score of 100 percent means every token lined up; the metric does not weight changes by how much text they affect.
No. They only normalize the copies used for comparison. The side-by-side panels always display your original input, so you can see exactly what was entered on each side.
No. Comparison, highlighting, and statistics all run in your browser, which makes the tool suitable for unpublished drafts and confidential documents.
git diff is line-oriented: it finds matching lines and marks whole lines as added or removed. This checker highlights inline word and character changes, which is usually more readable when reviewing edits inside sentences rather than code blocks.