Text Compare

The tool uses a Longest Common Subsequence (LCS) algorithm to compare texts at the word level. It identifies which words were added, removed, or kept unchanged between the original and modified versions, then highlights the differences inline.

This tool is designed for writers and editors who want to compare prose at the word level. Developer diff tools typically compare code line by line. This tool focuses on readability with inline highlights rather than side-by-side code panels.

Yes! All processing happens entirely in your browser. Your text is never sent to any server. No data is collected, stored, or transmitted.

Ignore Case treats uppercase and lowercase letters as the same. Ignore Whitespace collapses multiple spaces into one. Ignore Punctuation removes punctuation marks before comparing, so differences in commas or periods are not flagged.

Similarity is calculated as the number of unchanged words divided by the total number of unique words across both texts, expressed as a percentage. A score of 100% means the texts are identical under the current comparison options.