Shannon Entropy Calculator
Measure Shannon entropy in bits per character for any text.
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What is a Shannon entropy calculator?
A Shannon entropy calculator measures the unpredictability of text in bits per character, using the frequency of each character. Higher entropy means more randomness, which is useful for gauging password and key strength. Snabbit computes the entropy and total information content in your browser, so your input is never uploaded.
How to use the Shannon Entropy
- 1 Type or paste your text or string into the input box.
- 2 The entropy report calculates instantly.
- 3 Read bits per character and total information in bits.
- 4 Copy the figures if you need them.
What you can use it for
- Estimating the randomness of a password or token.
- Comparing the entropy of two strings.
- Teaching information theory with live examples.
- Checking how repetitive a piece of data is.
Frequently asked questions
What does bits per character mean?
It is the average information each character carries. Text using many equally likely characters has high entropy; repetitive text has low entropy, approaching zero.
How is entropy calculated?
Using Shannon’s formula: the negative sum over each character of its probability times the base-2 logarithm of that probability, giving a result in bits.
Can I use it to judge password strength?
It is a useful signal — total bits hints at how hard a string is to guess — but true strength also depends on how the string was generated. Everything runs locally in your browser.
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