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File entropy analyzer

Drop a file and see its Shannon entropy window by window next to a byte histogram, so compressed, encrypted, or padded regions stand out.

Drop a file to measure it

Any format · up to 128.0 MB · stays on your device
Choose a file

Drop a file to measure its entropy.

Shannon entropy counts how evenly the byte values are spread, from 0 bits (one value everywhere) to 8 bits (all 256 values equally common). It cannot tell encryption from compression; both read as high entropy. That is why the report compares against a typical range per format: high entropy in an archive is normal, high entropy inside a text file points at an embedded or packed payload. A uniform block in the middle of a file is usually padding, not a secret.
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