Show HN: Turn images into audio that can be decoded with a spectrogram

A little Show HN project about turning pictures into sound should have been a niche nerd demo. Instead, the comments turned it into a mini soap opera about secret messages, old-school chaos, and one extremely unserious adblock jab. The app itself is simple to explain: you feed it an image, it spits out an audio file, and if someone looks at that sound with the right visual tool, the picture appears. Yes, it’s basically “hide a picture in a noise file and reveal it later,” which is exactly the kind of thing the internet loves.

The strongest reaction was pure mischief. One commenter immediately declared it a sneaky way to send encrypted images, with the obvious thrill being that most people would never think to inspect a random audio clip for a hidden picture. Another went full conspiracy-comedy, joking that this is better than playing records backward for secret messages—except now the hidden surprise is an image lurking inside a recording. That vibe really dominated: half “wow, clever,” half “the internet absolutely cannot be trusted with this.”

And then there was the comic relief. One user summed it up as an “Orthogonal Frequency Division Multiplexing fax machine,” which sounds hilariously overcomplicated and wonderfully fake to normal humans. Meanwhile, the driest laugh in the thread came from the adblock crack: “Please disable adblock for free use. lol.” In other words, even when people are admiring a clever toy, the comments still find a way to start side-eyeing the business model