Does this check against the internet?

No. This tool compares only the two texts you paste into it. It does not search the web or any external database. For web-based plagiarism detection, use Copyscape, Turnitin, or Grammarly Plagiarism Checker.

How is similarity calculated?

It uses cosine similarity on word frequency vectors — the same technique used in information retrieval and NLP. It measures how similar the word distributions of two texts are, ignoring word order.

What does the 'shared phrases' section show?

It finds sequences of 3 or more consecutive words that appear in both texts. These are strong indicators of copied content or paraphrasing.

When is this tool useful?

Comparing two versions of a document to check for unintentional overlap, checking if a contractor's work is too similar to a competitor's content, or reviewing student submissions when you have the original.

Does this tool search the internet for plagiarism?

No. This tool compares only the two texts you provide. It does not fetch web pages or check against any external database. For web-wide plagiarism detection, use a dedicated service like Copyscape.

What similarity score is considered plagiarism?

A score above 30% suggests significant overlap and warrants review. Scores above 50% indicate substantial shared content. The threshold depends on context — academic work typically requires below 15%.

Is my text sent to a server?

No. The comparison runs entirely in your browser. Neither text leaves your device.

Plagiarism Checker — Compare Texts for Similarity Free Online

Compare two texts for similarity and shared phrases using cosine similarity scoring. Highlights overlapping content. Browser-based — does not search the web. Free.

Scope: This tool compares the two texts you paste below using cosine similarity. It does not search the internet or any external database. For web-based plagiarism detection use Copyscape, Turnitin, or Grammarly.

Text A (original)

Text B (compare)

Important: This tool compares two texts you provide using cosine word similarity. It does not search the internet or any database for matching content. For academic plagiarism detection against the web, use Turnitin, Copyscape, or similar services.

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What is Plagiarism Checker — Compare Two Texts for Similarity Free?

A plagiarism checker compares two pieces of text and calculates how similar they are using cosine similarity — a measure of shared word patterns and phrases. It highlights overlapping sentences and gives a similarity percentage. This tool is useful for comparing a draft against a source, checking if content has been paraphrased too closely, or verifying student submissions. Note: it compares the two texts you provide directly — it does not search the internet.

How to Use Plagiarism Checker — Compare Two Texts for Similarity Free

1Paste the original text into the left panel.
2Paste the text you want to check into the right panel.
3Click Compare to run the similarity analysis.
4Review the similarity score (0—100%).
5Examine the highlighted overlapping phrases in both texts.

Key Features

Cosine similarity scoring (0—100%)
Highlights overlapping phrases in both texts
Sentence-level similarity breakdown
Works with any text length
Runs entirely in your browser — no web search performed

Benefits

Verify content uniqueness before publishing
Compare a paraphrased text against its source
Check student submissions for copied passages
Identify overly similar sections that need rewriting

Why Use Irreva for Plagiarism Checker — Compare Two Texts for Similarity Free?

Verify content uniqueness before publishing

Compare a paraphrased text against its source

Check student submissions for copied passages

Runs 100% in your browser — files never leave your device.

No account, no sign-up, no subscription — free forever.

Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

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