Spectral Cipher ?

Quick guide

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What it does

Hides an image inside an audio file's spectrogram — the picture shows up when you look at the frequencies. Optional AES encryption.

How it's safe

Encoding and decoding happen locally. If you set a password, the payload is encrypted before it is woven into the audio.

Watch out

Heavy audio compression or format conversion can blur the spectrogram. Prefer lossless or high-bitrate exports when sharing.

Hide an image inside audio. The picture lives in the frequency spectrum - visible only through spectrogram analysis. Like Aphex Twin, but with encryption.