Free Online Audio Equalizer

An audio equalizer, or EQ, adjusts the balance between the frequencies of a sound. It divides the spectrum into bands — here ten, from 32 Hz in the deep bass to 16 kHz in the highest treble — and lets you raise or lower each one. Turning up the low bands adds weight, the middle ones bring voices forward, the high ones add clarity and air. An equalizer changes the tone of a recording, never its notes, its key or its tempo.

To make a recording sound the way you need it to. Musicians and singers use it to hear one part better — the voice, the bassline, the hi-hat — and learn it by ear. It also fixes everyday problems: a muffled phone recording, a harsh voice, a thin or boomy mix. And it adapts a track to where it is played: small speakers, headphones, a car, a quiet room at night.

Upload your MP3, WAV, M4A or MP4 into the box above and press Play. Pick one of the six presets or drag the ten bands — you hear each change straight away. Click a preset again to switch it off, double-click a band to reset it, or press Reset to flatten them all. When it sounds right, click Download: the Audio Studio opens with your file and the same settings.

Bass adds weight and punch to the kick and the bassline. Vocals brings the singer forward and makes the words clearer. Treble adds crispness and detail to cymbals, strings and consonants. Warm makes the sound rounder and softer, Bright makes it more open and airy, and Loudness — more bass and treble, slightly fewer mids — keeps a song full at low volume. Each preset moves several bands by a few decibels, and you can adjust any band afterwards.

Start with the Vocals preset: it lowers the deep bass slightly, below most voices, and lifts 500 Hz to 8 kHz, the most at 2 kHz, where the words and the presence of a voice sit. If the voice then sounds harsh, take 4 kHz down a notch; if it lacks body, add a little at 250 or 500 Hz; if the s sounds hiss, lower 8 kHz.

It makes up for the way we hear at low volume. The quieter the music, the less sensitive the ear is to bass and treble compared with the mids — the equal-loudness curves, known as Fletcher–Munson curves, show it. Loudness lifts the lows and the highs and dips the mids a little, as the Loudness button of a hi-fi amplifier does, so a song keeps its fullness when you practise quietly.

They are opposites. Warm lifts the bass and the low mids and softens the treble: the sound becomes rounder and gentler, which suits a harsh or thin recording and long listening sessions. Bright trims the low mids and lifts the treble: the sound becomes clearer and airier, which suits a muffled or dull recording. Not sure? Play the song and click one, then the other.

A few decibels are usually enough: 2 to 4 dB already make a clear difference, and none of the presets goes beyond 4 dB. Cutting what bothers you often sounds more natural than boosting everything else. Each band goes from −12 to +12 dB, and a limiter at the end of the chain keeps a strong boost from clipping, so the sound stays clean.

Yes, it is made for them. A singing teacher brings the voice forward with Vocals so a student can learn a melody by ear, softens a harsh recording before playing it in class, or clears up a lesson recorded on a phone. A music teacher lifts the bass to show how a bassline works, or the treble to make a hi-hat pattern easy to hear. In the Audio Studio, the track then goes into the student's key and can be shared with a link.

By letting you hear exactly what you are learning. With Vocals, a singer hears the melody, the words and the breaths more clearly; with Bass, a bassist follows the line; with Treble, a drummer or a guitarist catches the details of the playing. Record yourself, and Bright or Warm helps you hear your own voice or instrument more clearly, so you can judge your diction, your tone and your timing.

Yes. Upload an MP4 and the sound is equalized while the picture plays as usual — handy for a lesson video, a recital, a cover or a clip filmed on a phone. Click Download and the Audio Studio exports the complete video, picture untouched, with its new sound. To equalize YouTube videos while they play, the free KeyPitch Chrome extension has the same 10-band equalizer and the same six presets.

Click Download under the equalizer. The KeyPitch Audio Studio opens with the same file and the same ten bands already set, and exports it in the format you brought — MP3, WAV, M4A or MP4. Equalizing and previewing are free; downloading the finished file is paid: a single export, a discounted pack of exports, or a subscription with unlimited downloads.

Yes — on iPhone, Android, tablets and computers, in any modern browser, with nothing to install. Bear in mind that phone speakers cannot reproduce deep bass: use headphones or a good speaker to judge the low end.

The equalizer is free, with no account and no limit on the number of files: MP3, WAV, M4A and MP4 up to 50 MB and 10 minutes. On this page your file never leaves your device — it plays and is equalized inside your browser and is not sent to any server.