Spectrogram steganography is cool but existing tools already do this.
Steganography enthusiasts and audio experimenters
Sonic Visualiser · Audacity · Spek
Phase-continuous FSK with quadrature FM discriminator, zero audio libraries, pure TypeScript sine wave math.
This repo rips out STB-Image's fixed-point iDCT and 8-bit pipeline and replaces it with a float32 path so YUV->RGB conversion and resampling keep extra precision — you can actually see less banding in the provided GIFs and histograms. It also supports encoding float pixels back to JPEG and ships demos that explore recompression stability, which is a neat, very focused trick if you only have JPEGs (RAW still wins).
Offline-first browser converter, but remove.bg and CloudConvert already own this space.
Yet another free MP3-to-MP4 converter in a sea of identical tools.
Podcast app for newsletters, not a reader app with a listen button.
Yet another browser image converter; CyberChef, CloudConvert, Convertio already exist.
