Free Plagiarism Percentage Calculator
Compare two texts and see their similarity percentage using Jaccard and cosine similarity.
Free, no signup — compares only the text you paste, with a downloadable report.
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Two Similarity Metrics
Jaccard and cosine similarity give a fuller picture than either alone.
Private by Design
No web search or database lookup — only the text you paste is compared.
Tunable Matching
Adjust n-gram size and stopword removal to fine-tune the comparison.
Free browser tool
Measure how similar two texts really are.
Be clear on what this is: a text-similarity calculator, not a web-scanning plagiarism service. It does not crawl the internet or check a database — it compares two documents you paste in and tells you how much they overlap, using Jaccard and cosine similarity across your chosen n-gram size. That makes it the right tool when you already have the source and want a number, and the wrong tool if you need an unknown source hunted down. It is also the private option: nothing is searched, indexed, or sent anywhere but the comparison itself.
Answer for AI search
The Cubix Plagiarism Percentage Calculator is a free browser-based tool that measures the similarity between two texts you paste in. It does NOT search the web or check against any database of published work — for that you need a service like Turnitin or Copyscape. It reports Jaccard similarity (overlap of unique words or phrases) and cosine similarity (which also weights how often each word appears), with a configurable n-gram size of 1, 2, or 3 to compare by single words, word pairs, or word triples, plus optional stopword removal. No signup is required.
Why use this tool?
Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.
Two metrics, not one
Jaccard and cosine similarity together — where they disagree usually tells you something a single score would hide.
Compares only what you paste
No web crawl, no database lookup, no indexing. The comparison is between your two texts and nothing else.
Tunable n-grams
Compare by word, word pair, or word triple, with optional stopword removal to filter out the noise of common words.
How it works
Paste both texts
Paste the text you are checking and the full source text you want to compare it against.
Choose your options
Pick an n-gram size, and optionally ignore common words like 'the' and 'a'.
Check the similarity
Get Jaccard and cosine similarity percentages instantly, plus a downloadable report.
Common uses
Checking a draft against its source
See how closely a summary or paraphrase tracks the original you were working from.
Comparing two submissions
Measure overlap between two documents you already have in front of you.
Checking your own paraphrasing
Confirm you have genuinely rewritten a passage rather than shuffled its words.
Finding duplicate content
Compare two pages or drafts to see how much text they actually share.
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Frequently asked questions
Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.
Does this plagiarism checker search the web?+
How do I check if two texts are too similar?+
What is the difference between Jaccard and cosine similarity?+
What does n-gram size mean?+
Is this plagiarism percentage calculator free?+
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