Text Similarity Checker — Compare Two Texts, Find Real Overlap

How to use

1. Paste text A on the left, text B on the right.
2. The overlap %, matched-word count and longest common phrases appear instantly.
3. Use the phrase list to decide: coincidence, lazy paraphrase, or citation needed.

About this tool

This is the tool teachers and editors actually need: paste two versions — a student submission and a reference answer, your draft and a source you must not copy, two candidate intros — and get a precise overlap score plus the longest common word sequences listed verbatim. It is the same shingle-matching arithmetic search engines use for duplicate detection, running entirely on your device. Nothing is uploaded, nothing is stored. “How similar are these two texts” means different things in different jobs, so this text similarity checker scores the relationship three ways: token overlap (shared words as a percentage of each text), shared-sequence detection (the longest common word runs — the fingerprints editors actually look for), and length ratio (a 40-word summary of a 2,000-word article should not score as “dissimilar” just for being short). Draft-vs-final comparisons, paraphrase self-checks before submission, two-source verification and A/B copy comparisons all read the three numbers differently — which is why all three are shown instead of one magic percentage. The privacy property is the point: student essays, unpublished manuscripts and internal documents are exactly the texts that must not be pasted into random websites, so both text boxes live and compute entirely in your browser tab.

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