Text Similarity Checker

Compare any two texts in seconds

This text similarity checker tells you how alike two pieces of writing are. Paste an original and a rewrite, two product descriptions, two essays or your page and a competitor's page, and you instantly see a similarity percentage plus highlighted phrases that appear in both.

It is useful for:

• Writers and editors checking that a rewrite is really new
• SEO teams making sure location or product pages are not near-duplicates
• Teachers and students comparing two submitted texts
• Businesses checking whether a freelancer reused existing content

Everything runs in your browser. Your texts are never uploaded.

How the similarity score works

The tool combines two well-known methods:

• Cosine similarity compares which words are used and how often. It shows whether two texts talk about the same things. Read more about cosine similarity.
• Jaccard similarity on 3-word phrases measures how much exact phrasing the texts share. It catches copying even when a few words are changed. See the Jaccard index.

The final score weights phrase overlap more heavily, because shared wording is a stronger sign of copying than shared topic words. Any run of 4 or more words found in both texts is highlighted in yellow.

How to use it

1. Paste the first text into Text A and the second into Text B.
2. Optionally tick Ignore common words to focus on meaningful words.
3. Click Compare texts.
4. Read the score and verdict, then review the highlighted phrases.

How to read the result

Two articles about the same topic will always share some words, so a low score above zero is normal.

Limits to know

This tool compares two texts you provide. It does not search the internet for copies, which would need a paid plagiarism database. To compare several pages on your website at once, use our Duplicate Content Checker. To review how often keywords repeat in one text, try the Keyword Density Checker, and use the Word Counter for length.

Two scores, two meanings

This tool gives you more than one number because "similar" can mean different things:

• Word overlap (cosine similarity) looks at which words both texts use and how often. Two articles about the same topic will score fairly high even if they are written differently, because they share vocabulary.
• Phrase overlap (three-word sequences) looks for identical runs of words. This rises sharply when sentences are copied or only lightly edited.

A high word score with a low phrase score usually means same topic, different writing, which is normal. A high phrase score means large parts of the text are copied.

Practical uses

1. Checking a rewrite. You updated an old article and want to be sure it is truly new, not just a few words changed.
2. Reviewing freelance work. Compare a delivered article against a source the writer may have used.
3. Comparing your pages. Check whether two service or location pages on your site are too alike before Google treats them as duplicates.
4. Students and teachers. Compare an assignment with a known source. For checks against the whole internet, a dedicated plagiarism service is needed.
5. Version control for documents. See how much a contract or policy changed between two drafts.

How to rewrite content properly

If the phrase score is high and you need original content, editing a few words will not help. Instead:

• Close the source and write from your own understanding.
• Change the structure: a different order, different headings and your own examples.
• Add something new: your experience, local data, screenshots or a case study.
• Use your own voice, as if you were explaining it to a client.

Simply swapping words with synonyms produces awkward text and still keeps the original structure. Google's guidance on creating helpful, people-first content stresses original information and analysis.

Example: reading the result

Suppose you compare your new blog post with a competitor's article. Word overlap is 70 percent and phrase overlap is 5 percent. That means you cover the same subject in your own words, which is fine. If phrase overlap were 45 percent, the highlighted shared phrases would show exactly which sentences to rewrite.

After rewriting, check length with the Word Counter and topic focus with the Keyword Density Checker. For comparing pages that are already live on your website, the Duplicate Content Checker fetches and compares URLs for you.

Example: reviewing a freelancer's article

You ordered a 1,200-word article and suspect parts were copied from a competitor. Paste the competitor's article on one side and the delivered text on the other. The phrase overlap is 38 percent and several long sentences are highlighted as identical. That is a clear sign the writer reused text. Share the highlighted phrases with the writer and ask for an original rewrite, then compare again until the phrase overlap is low.

Quick tips for fair comparisons

• Compare the main text only; remove menus, footers and author boxes copied from web pages.
• Compare texts of similar length; a short paragraph inside a long article will always look partly similar.
• Remember that common phrases, quotes and technical terms can match naturally.
• Use the score as a guide, then read the highlighted phrases before making a decision.

Last updated: October 25, 2026