A downloadable tool for Windows

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SpectraGlyph

Hide your logo in sound. Reveal it in the spectrogram.

A Windows desktop app that paints images and text into the upper spectrum of an audio file — usually inaudible in speakers, but crystal-clear when someone opens a spectrogram in Audacity, Spek, or Sonic Visualiser.

Highlights

  • Dual modes: Invisible (>15 kHz) for a light touch on the mix, or Full range for bolder visuals.
  • Image or text: drop PNG/JPG/WebP or type in the app.
  • Masking: alpha, auto background, white/black removal, chroma key (any color), luminance, invert.
  • Live spectrogram with a draggable time × frequency region; preview updates as you edit.
  • Play what you see (original or watermarked) before you share.
  • Export WAV, FLAC, or MP3 (with a clear warning when lossy codecs may affect the watermark).
  • Recent files, presets, and a view guide you can copy so viewers match your FFT settings.
  • English & Swedish UI (View → Language).
  • Check for updates against GitHub Releases (in the built app).
  • Long audio: for large or long files, choose full load or a time range to work faster.

Requirements

Windows 64-bit (primary target).

SmartScreen

The downloadable .exe is built with open tooling and is not signed with a commercial certificate. Windows may show SmartScreen the first time you run it — use More info → Run anyway if you trust this project.

How viewers reveal the watermark

  1. Open the exported file in Audacity (or similar).
  2. Switch to spectrogram view.
  3. Typical settings: FFT 4096, Hann window, about 80 dB dynamic range.
  4. Use the in-app View guide for a copy-paste cheat sheet.
Published 21 hours ago
StatusIn development
CategoryTool
PlatformsWindows
Authorkingluii33
TagsAudio, Generator, spectrogram
Code licenseMIT License
Average sessionA few minutes
LanguagesEnglish, Swedish
InputsKeyboard, Mouse
LinksGitHub
AI DisclosureAI Assisted, Code

Download

Download NowName your own price

Click download now to get access to the following files:

SpectraGlyph-0.2.3-Windows-x64.exe 141 MB

Comments

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(+1)

Commenting here as a bookmark to myself

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