Security Analysis
String Entropy Analyzer
Entropy is a fast triage signal. Packed malware strings, stolen API keys and encrypted payloads all look random; English prose and config files do not. Paste a sample and compare.
Shannon entropy
0.00 bits/char
Length
0 chars
Unique characters
0
Total entropy
0 bits
Type or paste something to analyse.
The calculation happens in your browser with plain JavaScript. Nothing you paste is uploaded, logged or stored.
Reading entropy in practice
- English text sits around 3.5-4.2 bits per character; Base64 of random data lands near 5.5-6.
- A long, high-entropy string inside source code is often a leaked secret -- rotate it before anything else.
- Packers and shellcode raise entropy sharply, which is why EDR products flag high-entropy sections.
- Entropy alone is not proof: compressed images and legitimate tokens look identical to encrypted payloads.
Related tools
Security Log Analyzer
Paste sample logs and extract IPs, timestamps, users, URLs and severity indicators.
File Hash Calculator
Compute SHA-256, SHA-384 and SHA-512 file hashes without uploading the file anywhere.
IOC Defanger / Refanger
Safely defang and refang URLs, domains, IPs and emails when sharing indicators.