How to entropy analyzer — frequently asked questions
- Step 1Upload the file — Drop any file type. The analyzer processes it in browser memory — no upload, no account required.
- Step 2Read the overall score — The summary card shows the average entropy across all chunks. Below 4.0 suggests mostly text or structured data; above 7.0 suggests compression, encryption, or encoded binary data.
- Step 3Inspect the chart for anomalies — A flat high-entropy profile is expected for compressed files. Sudden spikes inside a low-entropy baseline indicate embedded payloads worth investigating.
Frequently asked questions
Why does my MP3 show 7.8 bits/byte?+
Audio compressed with MP3, AAC, or FLAC uses Huffman and entropy coding that produces near-maximal byte randomness — the same as ciphertext. High entropy is normal and expected for compressed media files.
What entropy score should concern me?+
Context is everything. A .exe with entropy consistently above 7.5 across the entire file is unusual — most unpacked binaries average 5.5–6.5. A .txt with entropy above 6.0 is also suspicious.
Can the analyzer process files larger than 500MB?+
Pro tier allows files up to 500MB; Developer tier allows up to 5GB. Large files are processed in streaming chunks to avoid browser memory exhaustion.
Does high entropy prove encryption or just compression?+
Neither alone. Entropy cannot distinguish AES ciphertext from zlib output — both appear near-random. Use the magic byte validator to check the header and entropy analysis together for context.
Privacy first
Every JAD Security operation runs entirely in your browser. Files, passwords, and PGP private keys never leave your device — verified by zero outbound network requests during processing.