in-browser tool

Free online audio analyzer

Drop a track and read it like a mastering engineer — loudness, peaks, dynamics, key, tempo and spectrum. It all runs in your browser; the file is never uploaded anywhere.

AUDIO ANALYZER

Loudness · True Peak · Spectrum · Metadata
ITU-R BS.1770-4 · EBU R128

Free and fully local — your files never leave the browser. No upload, no account, no ads.

⎙

Drop an audio file here

Everything runs in your browser — the file is never uploaded

WAV · FLAC · MP3 · AAC/M4A · OGG · OPUS · AIFF
Decoding… 0%
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Playback
0:00
0:00
Real-time spectrum
VU meter (RMS, dBFS)
L
R
−60 −45 −30 −15 0
Equalizer · 8 bands
Key & tempo
Tempo grid · align to transients drag — move track · double-click — set beat
— BPM from grid
phase zoom amplitude
Chroma profile · 12 semitones orange — tonic
Camelot · key wheel orange — your track, teal — mix-compatible keys
Genre
Similar tracks
A neural net compares your track's sound to a database of real tracks across 400 style features and finds the closest matches — with previews right here and links to Apple Music, YouTube and Yandex Music. Everything runs in your browser.
Technical specs
Loudness & dynamics
Platform targets · integrated loudness
Waveform & peaks
Waveform drag — move · red — clipping (above −1 dBTP)
zoom gain
Loudness over time
Momentary (400 ms) · Short-term (3 s) · Integrated
Momentary Short-term Integrated −14 LUFS
Average spectrum
Average magnitude spectrum log frequency scale, 20 Hz – Nyquist
Spectrogram
Spectrogram time → / frequency ↑ (log) / energy — colour
TRACK A
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TRACK B
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Metric comparison
Loudness over time · A vs B
Short-term (3 s) + Integrated
A · short-term A · integrated B · short-term B · integrated −14 LUFS
Average spectrum · A vs B
Average magnitude spectrum log frequency scale
Track A Track B
Waveform
Track A
Track B
Spectrograms
Track A
Track B

What it measures

  • LUFS — integrated, short-term (3 s) and momentary (400 ms), to ITU-R BS.1770-4 / EBU R128.
  • True Peak (dBTP) — oversampled inter-sample peaks, with clipping highlighted above −1 dBTP.
  • Dynamics — loudness range and crest, so you can see how squashed or open a master is.
  • Key & tempo — musical key on a Camelot wheel (with mix-compatible keys), chroma profile, and a draggable tempo grid / BPM.
  • Genre & similar tracks — an optional neural pass (runs in-browser) that names the style and finds close-sounding tracks.
  • Spectrum & spectrogram — average magnitude spectrum and a full spectrogram, plus a live real-time spectrum and VU on playback.
  • A/B compare — line two masters up side by side and export the report to PNG or PDF.

Streaming loudness targets

Most platforms normalize to an integrated-loudness target. The analyzer checks your master against the common ones:

  • Spotify, YouTube, Amazon — around −14 LUFS.
  • Apple Music — around −16 LUFS.
  • Podcast platforms — around −16 LUFS.
  • Broadcast (EBU R128) — −23 LUFS.

Aim a touch under the target and keep True Peak below −1 dBTP so lossy codecs don't clip on playback.

FAQ

Does my file get uploaded to a server?

No. The whole analysis runs locally in your browser with the Web Audio API and WebAssembly. Your audio never leaves your device.

How is LUFS different from dBFS?

dBFS is the peak level of the loudest sample. LUFS is perceived loudness — it factors in time and the ear's frequency response. Two tracks with the same dBFS peak can sound very different in LUFS.

Which formats are supported?

WAV, FLAC, MP3, AAC/M4A, OGG, OPUS and AIFF — anything your browser can decode.

How accurate is it?

Loudness follows ITU-R BS.1770-4 / EBU R128 and True Peak uses oversampling, so results track professional meters closely. Tiny differences can come from the decoder and resampling.