Blank: Hide in Sound

Hide a private message inside an ordinary-sounding audio file. Encrypted with your password, on your device. Only you and your recipient can reveal it.

Blank hides private messages inside ordinary-sounding audio. Pick a sound, type a secret, set a password — and Blank gives you back a normal .wav file with your message woven invisibly inside. Anyone can play it; only someone with the password can reveal what’s hidden.

Everything happens on your device. Your messages and passwords never leave your iPhone.

HOW IT WORKS • Encrypt — your message is sealed with AES-256 using your password • Hide — the encrypted data is woven into the audio, inaudibly • Reveal — open a Blank file, enter the password, read the message

FEATURES • Hide encrypted text inside 16-bit WAV audio • Built-in cover sounds, or import your own • On-device only — nothing is ever uploaded • Verify-on-decode: a wrong password or an altered file is detected, not faked • Face ID app lock • Light & dark, designed clean and modern • Preview the audio in-app before you share

BLANK PRO A one-time purchase unlocks unlimited message length. The free version hides short messages.

IMPORTANT — SHARE AS A FILE Send Blank audio as a file (AirDrop, Files, email). Sending it as a voice note, or through apps that re-compress audio, will erase the hidden message.

Blank is a privacy and education tool built around classic audio steganography and modern encryption.