Free Tool

Frequency Analyzer

Upload an audio file for real-time frequency analysis. Your files never leave your browser — all processing happens locally. No signup, no install, completely free.

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Peak Frequency

---Hz

The loudest frequency at this moment. Helps you spot resonances, ringing notes, or dominant elements. The musical note shows which pitch it corresponds to.

RMS Level

---dB

The average loudness of the signal. For mixing, aim for -18 to -12 dBFS for healthy headroom. For mastered tracks, -10 to -6 dBFS is typical.

Crest Factor

---dB

The difference between peak and average loudness. Higher = more dynamic, punchier. Lower = more compressed. A healthy mix typically reads 8-14 dB. Below 6 dB often sounds crushed.

Spectral Centroid

---Hz

The "centre of gravity" of your frequency spectrum — where the average energy sits. Lower values sound darker and warmer. Higher values sound brighter and more present. Most balanced mixes sit around 1-3 kHz.

Stereo Width

---%

How wide the stereo image is. 0% = mono (all centre). 100% = fully wide. Very high values (>90%) may indicate phase issues. A solid mix typically reads 40-70%.

Frequency Bands

Sub

Low

L-Mid

Mid

H-Mid

High

Air

Problem Zones

No issues detected

How to Use This Frequency Analyzer

This free online frequency analyzer lets you inspect the spectral content of any audio file directly in your browser. No downloads, no sign-ups required.

🔒 Your audio stays private. All processing happens entirely in your browser using the Web Audio API. Your files are never uploaded to any server. Buchert Audio does not collect, store, or access your audio in any way.

Upload a file: Click "Upload File" and select a WAV, MP3, FLAC, OGG, or AAC file. You can also drag and drop directly onto the spectrum display.

Read the spectrum: The horizontal axis shows frequency (20 Hz to 20 kHz on a logarithmic scale). The vertical axis shows amplitude in dB.

Read the meters: The sidebar shows detailed analysis — hover or tap each metric for an explanation of what it means for your mix.

Watch for problem zones: The analyzer highlights common mixing issues like mud (200-500 Hz buildup) and harshness (2-5 kHz peaks).

What Is a Frequency Analyzer?

A frequency analyzer (also called a spectrum analyzer) uses Fast Fourier Transform (FFT) to break an audio signal into its component frequencies. It shows you the amplitude of each frequency band, making it easy to identify resonances, imbalances, and problem areas in a mix. Audio engineers use frequency analyzers during mixing, mastering, and sound design to make more informed EQ decisions.

Understanding the Frequency Bands

Sub (20-60 Hz): The lowest frequencies. Felt more than heard. Kick drum fundamentals and bass rumble live here.

Low (60-200 Hz): Bass guitar fundamentals, warmth, and body. Too much energy here makes a mix boomy.

Low-Mid (200-500 Hz): The "mud zone." Buildup here makes mixes sound boxy and unclear.

Mid (500 Hz-2 kHz): Vocal presence and instrument definition. Critical for clarity.

High-Mid (2-5 kHz): The "harshness zone." Presence and attack live here, but too much causes listener fatigue.

High (5-10 kHz): Sibilance, cymbal shimmer, and high harmonics.

Air (10-20 kHz): Airiness and sparkle. Adds openness to a mix when present in moderation.

Frequency Analyzer

Shape your sound with precision

How to Use This Frequency Analyzer

What Is a Frequency Analyzer?

Understanding the Frequency Bands