Text Similarity Checker

The score is a Dice coefficient: the tool computes the longest common subsequences between the two texts at character, word and line level, and reports how much of the combined content they share. 100% means the texts are identical; 0% means they have nothing in common. The headline number is the character-level score — the most sensitive of the three.

The three levels answer different questions. Character similarity notices tiny edits (a fixed typo barely moves it). Word similarity tracks rephrasing — swapped, added or removed words. Line similarity tells you how much of the document structure survived, which is useful for code, CSV data and configuration files.

Typical uses: measuring how much a rewrite actually changed, detecting near-duplicate pages or product descriptions, comparing a translation revision against the previous version, or checking whether a submitted text is a light paraphrase of a known source. Note this compares the two texts you provide — it does not search the web like a plagiarism scanner.

Use the options to make the score fairer: “Ignore whitespace” discounts formatting-only changes, and “Ignore case” treats capitalization changes as identical. As with every tool on this site, the computation runs entirely in your browser.