Text Similarity Checker

Compare and check similarity between texts

The Text Similarity Checker analyzes two separate documents or text blocks to calculate the degree of overlap and similarity. Essential for checking for plagiarism, comparing drafts, and ensuring content uniqueness. Check text similarity now!

Compare two texts using 6 advanced algorithms: Jaccard Index, Cosine Similarity, Edit Distance, Word Overlap, Sentence Overlap, and Bigram Similarity. Press Ctrl+Enter to analyze.

Quick Examples

Analysis Options

Configure how texts are compared

Ignore Stop Words ON OFF

Filters common words (the, and, is) for more accurate semantic comparison • Re-analyzing...

Text Comparison Input

First Text

Second Text

Overall Similarity

Text Statistics

Text 1

Characters:

Words:

Sentences:

Unique Words:

Common

Shared Words:

Common words:

Text 2

Characters:

Words:

Sentences:

Unique Words:

Algorithm Breakdown

Jaccard Index

Formula: |A ∩ B| / |A ∪ B|
Compares unique words shared vs total unique words

Cosine Similarity

Formula: (A · B) / (||A|| × ||B||)
Measures angle between word frequency vectors

Edit Distance

Algorithm: Dynamic programming
Counts minimum character edits needed

Word Overlap

Formula: |A ∩ B| / min(|A|, |B|)
Shows what % of smaller text is in larger

Sentence Overlap

Method: Jaccard per sentence
Matches similar sentences (>30% threshold)

Bigram Similarity

Method: N-gram shingling (2-word sequences)
Detects word reordering: "Dog bites man" ≠ "Man bites dog"

Click to download analysis as JSON file

Understanding Similarity Scores

80-100% Very High: Texts are nearly identical or extremely similar

60-79% High: Strong similarity, likely related content or paraphrase

40-59% Medium: Some similarity, possibly same topic or theme

20-39% Low: Limited similarity, different contexts or subjects

0-19% Very Low: Minimal or no similarity between texts

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How to Use

Step-by-step guide 3 steps

1 Enter Text A & Text B: Paste the text blocks you want to compare into two separate fields.
2 Compare: Click "Check Similarity".
3 View Report: The tool analyzes the two texts, instantly calculating the percentage of overlap and highlighting specific sections where exact or near-exact matches were found.

FAQ

Common questions 3 questions

What is the difference between similarity and plagiarism?

Similarity is a neutral measure of overlap. Plagiarism implies the similarity is deliberate and uncredited. This tool measures the former, aiding in the detection of the latter.

Does it check against the entire Internet?

No. This tool checks the similarity only between the two texts you provide. It is a local comparison tool, not a full Internet-wide plagiarism database checker.

How does this help ensure content uniqueness for SEO?

You can use it to compare new content against your own existing web pages to ensure you are not accidentally creating duplicate content, which is penalized by Google.

Use Cases & Examples

Real-world applications 3 examples

Duplicate Content Check

Example Keyword: check text for content overlap
Compare a new article draft against existing internal pages to avoid creating penalized duplicate content.

Plagiarism Detection

Example Keyword: calculate text similarity percentage
Quickly check a submitted paper or outsourced content against a source text to confirm its originality.

Version Comparison

Example Keyword: compare two documents for changes
Analyze two different drafts of the same document to quickly see the percentage of changes made between versions.