Audio Equalizer Online — 10-Band Real-Time EQ

A professional-grade 10-band audio equalizer with real-time preview, spectrum analyzer, and 14 genre presets. Adjust frequencies, apply high/low-pass filters, compare with A/B bypass — runs via Web Audio API in your browser.

How to Use the Equalizer

Upload your audio

Drop an MP3, WAV, FLAC, OGG or any audio file onto the upload area.

Choose a preset or adjust manually

Select from 14 genre presets or drag the 10 band sliders to create a custom EQ curve.

Preview in real-time

Press play to hear the EQ applied instantly. Use A/B toggle to compare with the original.

The EQ curve is baked into the file

Choose your output format, click Save, and download the processed file.

Shape your sound with a professional 10-band equalizer, spectrum analyzer, and instant preview

Drop audio or video here

MP3, WAV, FLAC, OGG, M4A, AAC, OPUS ·

Loading file...

🎵

125

250

500

16k

Double-click a slider to reset that band to 0 dB · Drag the dots right on the graph

High-Pass 80 Hz

Low-Pass 16k Hz

Limiter

Saturation 0%

Volume 100%

0:00 / 0:00

Format

Quality

Process

What each band actually controls

The ten sliders sit at fixed frequencies. Knowing what lives at each one turns guesswork into a decision — this is the same map engineers keep in their heads.

Band	What lives there
32 Hz	The very bottom: rumble, vibration, room noise. Laptop and phone speakers cannot reproduce it at all.
64 Hz	The foundation of kick drum and bass guitar — this is where the weight of a track comes from.
125 Hz	The bottom of a male voice and the body of a snare; too much of it turns the sound boomy.
250 Hz	The muddy zone: this is where the murk of a room recording piles up.
500 Hz	The body of instruments; an excess makes the sound boxy, like a cardboard tube.
1k Hz	The center of intelligibility — the ear is most sensitive right here.
2k Hz	Consonant attack and the pluck of a string; helps a voice cut through a mix.
4k Hz	Presence: the voice steps forward, but it turns harsh very easily.
8k Hz	Air and sibilance — and the same place where tape and mic hiss becomes audible.
16k Hz	The very top, felt rather than heard as “air”; past forty, many people no longer hear it at all.

Practical notes

The bands are bells, not steps: moving one also nudges its neighbors, so +6 dB at 1 kHz is audible at 800 Hz too.
In 10-band mode the bells are wide (Q 1.4); switching to 31 bands narrows them (Q 4.32), which is what makes surgical cuts possible.
Cutting what is in the way beats boosting what is missing: every boost eats headroom and brings clipping closer.

Features

10-band graphic EQ (±12 dB) with real-time preview and 14 genre presets

Presets span Bass Boost, Vocal, Rock, Hip-Hop and Loudness, from sub-bass to the air band.

FFT spectrum analyzer and frequency response curve visualization

A live Fast Fourier Transform display overlays your EQ curve so you see exactly what each band changes.

High-pass / low-pass filters, output limiter, and A/B bypass toggle

Cut rumble below 80 Hz or hiss above 12 kHz while the limiter prevents clipping on boosted bands.

Multiple export options — all processing in your browser

Save to MP3, WAV, or FLAC, with lossless WAV/FLAC available for studio-quality output.

31-band third-octave mode and curve editing right on the graph

Switch from the classic 10-band grid to 31 third-octave bands with dedicated 8, 10, 12.5 and 16 kHz sliders, or drag the handles on the response curve like in studio parametric EQs.

Frequently Asked Questions

What does an equalizer do?

An equalizer adjusts the volume of different frequency ranges. Bass boost increases lows (32-250 Hz) for deeper sound, treble boost enhances highs (4-16 kHz) for clarity, and vocal enhance focuses on midrange where human speech lives (500 Hz - 4 kHz).

Can I hear changes in real-time?

Yes! All EQ adjustments are applied instantly via Web Audio API. Move any slider and hear the difference immediately. Use the A/B bypass button to toggle between the original and equalized audio.

What are the high-pass and low-pass filters?

A high-pass filter removes frequencies below its cutoff (e.g., 80 Hz removes rumble and hum). A low-pass filter removes frequencies above its cutoff (e.g., 12 kHz removes hiss). Both are essential for cleaning up audio.

Will EQ reduce audio quality?

Minimal impact. Boosting frequencies can increase noise slightly, but the built-in limiter prevents clipping. For lossless output, choose WAV or FLAC format.

What is the spectrum analyzer showing?

The spectrum analyzer displays the frequency content of your audio in real-time using FFT (Fast Fourier Transform). The curve overlay shows your EQ settings — how much each frequency is boosted or cut.

How do I boost or cut exactly 10 kHz?

Switch the grid from 10 to 31 bands with the toggle above the sliders — the third-octave mode has dedicated 8, 10, 12.5 and 16 kHz bands. In 10-band mode the 8 kHz slider covers 10 kHz too: its bell is about an octave wide and reaches roughly 11 kHz.

Can I apply one setting to a whole folder?

Yes. Pick a folder or several files at once: you tune the curve on the first track, and "Apply to all" runs the rest through exactly that curve. Peaks are checked per file, so a boost never clips the louder tracks. Take the results as a ZIP or save them straight into a folder.

💡 Want us to improve this tool just for you?

We can! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

How do you rate this tool?

4.7 (3 ratings)

Thank you for your rating!

Change my rating

Want to leave a comment?

Want to share more? Leave a comment!

Thank you! Your comment will appear after moderation.

Comments

SW SG RKM 2 months ago

VOICE COMPRESSOR COULD BE ADDED

Who is this tool for?

Published 01 Feb 2026 Updated 09 Jun 2026 Author: The Supreme