Original (differences highlighted)
Compared (differences highlighted)
ℹ️ About this tool
Free Online Text Similarity & Paraphrase Detector
Compare two texts side by side and instantly detect paraphrasing with the Paraphrase Detector. This free tool highlights every difference at the word level, calculates a similarity percentage, and helps you verify originality. No signup required, and your texts never leave your browser.
How to Use the Paraphrase Detector
Paste the original text in the left field and the text you want to compare in the right field. Click Compare and the tool will analyze both texts, highlighting differences in each version with color-coded markers. Review the similarity score displayed at the top and examine the highlighted sections to understand exactly what was changed, reworded, or rearranged between the two versions.
Why Use This Paraphrase Detector
This tool is completely free with no account required. It runs entirely in your browser so your texts stay private and are never stored. You get instant word-level difference highlighting and a clear similarity percentage, making it easy to assess how closely one text mirrors another.
Popular Use Cases
Teachers and professors use the Paraphrase Detector to check whether student submissions are original or closely paraphrased from a source. Writers compare draft revisions to track exactly what changed between versions. Content teams verify that rewritten articles are sufficiently different from the original. Researchers compare abstracts or summaries against source material to ensure proper rewording.
Frequently Asked Questions
How does the paraphrase detector work?
The tool analyses both texts at the word and phrase level, identifying segments that have been reworded, reordered, or replaced. It highlights the differences in each text and calculates an overall similarity score so you can quickly judge how closely one text mirrors the other.
Can it detect AI-generated paraphrases?
The detector compares the two texts you provide and highlights structural and lexical changes regardless of how they were produced. It does not determine whether a text was written by a human or an AI, but it clearly shows what was changed between the two versions.
Is my text stored or shared?
No. The comparison runs entirely in your browser. Your texts are never uploaded to a server and are discarded the moment you leave or refresh the page.
What similarity percentage indicates paraphrasing?
There is no universal threshold, but texts with 70-90% similarity that show systematic rewording of phrases typically indicate paraphrasing. Below 50% usually suggests independent writing, while above 90% points to near-copy with minor edits.
Can I compare texts in different languages?
The tool compares texts character by character and word by word, so it works best when both texts are in the same language. Comparing texts in different languages will show nearly everything as different since the words themselves differ.
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