How to steganography decoder — frequently asked questions
- Step 1Drop a PNG or BMP image — Only lossless formats are supported. JPEG files will show a format warning rather than an extraction attempt.
- Step 2Read the extracted text — If a null-terminated payload is found, it appears in the output panel. Copy or download the content.
- Step 3Interpret the result — Readable text → payload found. High-entropy garbage → encrypted payload likely embedded. Empty output → no standard LSB payload detected.
Frequently asked questions
Why doesn't JPEG work?+
JPEG uses lossy DCT compression that alters pixel values when saving. LSB data written into a JPEG is destroyed when the file is saved or re-opened. Only lossless formats (PNG, BMP, TIFF) preserve LSB data.
My extraction shows garbled characters — what does that mean?+
The image may contain: (1) an encrypted payload (ciphertext looks random), (2) a binary payload (non-text data), or (3) no payload at all (random LSBs produce random-looking output). Pair with the Entropy Analyzer — very high entropy in the extracted bytes suggests encryption.
Can the tool detect all steganography techniques?+
No. It implements sequential RGB LSB extraction only — the most common algorithm. DCT-domain steganography (JSteg, Outguess), palette-based techniques, and non-sequential pixel selection patterns require dedicated steganalysis tools.
Does extracting a payload prove someone hid data intentionally?+
No. Null-terminated readable text is strong evidence, but natural image noise can occasionally produce short apparent 'payloads'. Evaluate the extracted content, its length, and its coherence before drawing conclusions.
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.