ToolJoltTools

Audio Spectrum Snapshot

Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master.

This averages thousands of FFT windows into one magnitude spectrum (log-frequency), the fastest way to spot a tonal-balance problem: a dip in the sub, a 3 kHz harshness ridge, or a brick-wall roll-off that reveals a low-bitrate MP3 source masquerading as a master. It complements your ears — not a replacement for them.
References: Smith, J.O., 'Mathematics of the DFT'; AES — spectral balance in mastering

🔒 Everything runs in your browser — your audio is never uploaded.

Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master.

About Audio Spectrum Snapshot

Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master. Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master.

How to use Audio Spectrum Snapshot

  1. 1Drag a file onto Audio Spectrum Snapshot, or click to choose one — it is analysed locally and never uploaded.
  2. 2Wait a moment while the tool processes the file entirely in your browser.
  3. 3Read the result, metrics and pass/fail verdict.
  4. 4Copy or export the report for your delivery, QC log or records.

Why use Audio Spectrum Snapshot?

  • ✓Analyses your file entirely in your browser — it is never uploaded, so even confidential masters stay private.
  • ✓100% free with no sign-up, no watermark and no usage limits.
  • ✓Works on any device — desktop, tablet or phone — and keeps working offline once loaded.

Frequently asked questions

What does Audio Spectrum Snapshot do?+

Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master. Render the average frequency spectrum of a file (FFT) so you can spot a missing low end, harsh highs, or a hard low-pass before signing off a master.

Is my file uploaded to a server?+

No. Audio Spectrum Snapshot processes your file entirely in your browser using local JavaScript and the Web platform — your media never leaves your device, so it is safe for unreleased or confidential content.

Is Audio Spectrum Snapshot free to use?+

Yes — it is completely free with no account, no sign-up and no usage limits. There is no watermark and no paywall.

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