A full specimen plate of your track: frequency over time in ink, with key, tempo, length and loudness printed in the margin. Drawn in your browser and downloadable as an image.
Max 100 MB · max 15 minutes · MP3, WAV, M4A, FLAC, OGG
Nothing is uploaded. The file is decoded and measured inside your browser.
A spectrogram shows what a waveform cannot: which frequencies are present at every moment of a track. Bass sits at the bottom of the plate, cymbals and air at the top, and the density of the ink tells you how much energy is there.
SKELETUNE draws the whole file as one printed plate and prints the measured key, tempo, length and integrated loudness alongside it, so the image is both a picture and a readable record of the track. Decoding and analysis happen in your browser; no audio is uploaded anywhere.
WAV, MP3, FLAC, M4A, OGG — up to 100 MB and 15 minutes.
Square, portrait or story, each exported large enough to post without softening.
Save the image and share it. Playback lets you follow the plate as you listen.