Text Similarity Checker
Compare two texts and get a similarity percentage score. Measure how similar or different two blocks of text are.
About This Free Online Text Similarity Checker
Our free online Text Similarity Checker compares two blocks of text and calculates a similarity percentage using multiple algorithms. Get an overall similarity score, see which phrases and sentences are shared between texts, and view detailed breakdowns of word overlap, character overlap, and longest common subsequence. Perfect for checking document similarity, verifying rewritten content, comparing drafts, and detecting overlap between texts. All processing runs in your browser.
Features of Our Text Similarity Checker
- Overall similarity percentage score
- Word overlap analysis
- Character-level similarity
- Longest common substring detection
- Shared phrase highlighting
- Detailed breakdown statistics
- 100% private — browser-only processing
How to Use the Text Similarity Checker
Using this tool is simple and requires no signup or registration. Follow these steps:
- Paste the first text into the left textarea.
- Paste the second text into the right textarea.
- View the similarity percentage and detailed analysis instantly.
- Use the breakdown to understand which parts match.
Frequently Asked Questions About Text Similarity Checker
How is the similarity percentage calculated?
The tool combines multiple metrics: word overlap (Jaccard similarity), character n-gram overlap, and longest common subsequence ratio for a comprehensive score.
What does a high percentage mean?
A high percentage (80%+) means the texts share most of their content. A low percentage (below 30%) means they are largely different.
Is this a plagiarism checker?
This tool measures similarity but is not a plagiarism checker. It compares the two texts you provide without searching external sources.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.