Audio Equalizer PRO

About Audio Equalizer PRO

This professional online audio equalizer lets you adjust frequency bands with precision. Choose from 3-band to 31-band EQ for detailed control. Features include real-time spectrum analyzer, stereo peak meters, high/low pass filters, custom preset management, and export to multiple formats including MP3 and FLAC. All processing happens locally in your browser using Web Audio API.

What makes this a professional equalizer?

This tool includes features found in professional DAWs: 31-band graphic EQ, parametric mode with adjustable Q factor, real-time spectrum analyzer, stereo peak meters with clipping detection, high/low pass filters with selectable slopes, output limiter, and support for lossless export formats.

What is the Spectrum Analyzer?

The spectrum analyzer displays the frequency content of your audio in real-time. It helps you visualize which frequencies are prominent, making it easier to make informed EQ decisions. Choose between bar graph or line display modes.

What do the Peak Meters show?

The L/R peak meters show the volume level of each stereo channel in decibels. The green-yellow-red gradient indicates safe levels (green), moderate levels (yellow), and near-clipping (red). Peak hold indicators show the maximum level reached.

What is Parametric vs Graphic EQ mode?

Graphic EQ mode uses fixed frequency bands with standard bandwidth. Parametric mode lets you adjust the Q factor (bandwidth) of each band - lower Q values affect a wider frequency range, while higher Q values create narrower, more surgical adjustments.

What are High-Pass and Low-Pass filters?

High-Pass Filter (HPF) removes low frequencies below the cutoff point - useful for eliminating rumble, wind noise, or mud. Low-Pass Filter (LPF) removes high frequencies above the cutoff - useful for reducing hiss or harshness. Slope options (12dB/24dB per octave) control how aggressively frequencies are cut.

What does the Limiter do?

The limiter prevents audio from clipping (distorting) when you boost frequencies. Soft limiting (-3dB threshold) provides gentle, transparent limiting. Hard limiting (-1dB) provides maximum protection but may affect dynamics more noticeably.

Can I save my EQ settings?

Yes! Click the save button to store custom presets locally in your browser. You can also export presets as JSON files to share or backup, and import presets from files.

What audio formats are supported for export?

Export to WAV (lossless, instant), MP3 (with quality selection 128-320kbps), OGG Vorbis, or FLAC (lossless compression). MP3, OGG, and FLAC require loading FFmpeg in your browser (about 30MB download, one-time per session).

What is the Loop feature?

The loop feature lets you select a region of the audio to repeat continuously. This is useful for testing EQ changes on a specific section. Drag the purple region handles to adjust the loop start and end points.

What do Stereo Width and Balance do?

Balance adjusts the left/right volume ratio. Stereo Width controls how wide the stereo image appears: 0% creates mono, 100% is normal, and 200% exaggerates the stereo separation. These settings are applied during export.