Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

Calculate text entropy online for free. Measure text randomness and complexity. Information theory analysis.

Enter Text or Password

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Enter text above to calculate entropy and analyze complexity

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Enter text or password
Type or paste the text you want to analyze for entropy
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View entropy metrics
See Shannon entropy, password strength, and complexity score
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Review character distribution
Check how characters are distributed across different types

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Type or paste the text you want to analyze for entropy

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See Shannon entropy, password strength, and complexity score

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Check how characters are distributed across different types

Shannon entropy measures the unpredictability or randomness of text, calculated in bits per character. Higher entropy means more random.

Password strength is based on character pool size (lowercase, uppercase, digits, special) and length, estimating resistance to brute force.

For passwords, aim for at least 60 bits of entropy. Higher values (128+) indicate very strong, random text.

No, all calculations are done locally in your browser. Nothing is sent to a server or stored.