/ Free online tool — Spectrogram viewer
Drop a file.
See the spectrum.
An STFT spectrogram of any audio file, on a log-frequency axis. Zoom, pan, and export a PNG. No upload. No sign-up.
Click or drop audio.
WAV, MP3, FLAC, OGG, M4A, or AAC.
/ Method
How the spectrogram
is built.
Method: short-time Fourier transform · Built by Sample Vault
The same spectral analysis the desktop app runs against your library, in your browser.
/ 01 — Short-time FFT
The audio is split into short overlapping frames. Each frame is windowed and run through a Fourier transform, turning a slice of time into the frequencies present in it.
/ 02 — Log-frequency axis
Frames are stacked left to right to make time, frequency runs bottom to top on a logarithmic axis, so each octave gets equal space and the low end stays readable.
/ 03 — Honest colour
Loudness at each point maps to colour through a perceptually-even palette — dark for quiet, bright for loud. No neon, no guesswork; the picture matches the numbers.
/ 04 — Fully local
The file never leaves your machine. Loads once, runs offline thereafter. Useful for unreleased material, label stems, and anything you can't put through a third-party service.
/ Across your library
From one file
to fifty thousand.
The desktop app reads brightness, band balance, stereo width, and ~40 other features from every file in your sample folders — then lets you search the way you'd describe a sound out loud.
/ Embed on your site
Put it on
your page.
Free to embed on any blog, forum, or lesson page. Paste the snippet where you want the spectrogram viewer to appear. Analysis runs in the reader's browser — nothing is uploaded.
<iframe src="https://samplevault.ai/embed/spectrogram" title="Free spectrogram viewer by Sample Vault" width="100%" height="620" loading="lazy" style="border:1px solid #262626;width:100%;max-width:680px"></iframe>
<p style="font:12px/1.5 system-ui,sans-serif;margin:8px 0 0">Free <a href="https://samplevault.ai/tools/spectrogram" target="_blank" rel="noopener">spectrogram viewer</a> by <a href="https://samplevault.ai" target="_blank" rel="noopener">Sample Vault</a></p>/ 09 — FAQ
Spectrogram viewer — frequently asked questions
Spectrogram questions, answered straight.