What does an equalizer do?
An equalizer turns different frequency ranges up or down. The lows (32 to 250 Hz) add body and punch; the mids (500 Hz to 2 kHz) hold most of the voice and instruments; the highs (4 to 16 kHz) bring brightness, air and detail. Adjusting them lets you fix a dull recording, tame room boom or tailor a song to a particular set of speakers.
This equalizer has ten bands from 32 Hz to 16 kHz, each ranging from −12 to +12 dB. The outer bands are shelf filters that affect everything below or above them; the middle ones are peaking (bell) filters that act around their frequency. If you’re not sure where to start, try a preset: Vocal and Podcast boost intelligibility and cut muddy lows, Rock, Pop and Electronic give the classic V-shaped curve, and Loudness compensates for listening at low volume.
Boosting bands raises the overall level and could cause clipping. To prevent this, the result is automatically set just below the maximum, so the final file never distorts from digital clipping.
Processing happens in your browser. You get one free try with a single file; with ToolStudio Pro you can apply the same EQ to several files at once, with no limits.
How to equalize audio
- Upload your audio file.
- Pick a preset or move each band up or down.
- Click “Apply equalizer”.
- Listen to the result and compare it with the original; tweak and apply again if you like.
- Download it as MP3 or WAV.
When to use an equalizer
- Make the voice clearer in a podcast, lecture or interview.
- Remove excess bass from a recording made on a phone.
- Add brightness to a song that sounds dull.
- Tailor music to small speakers or car speakers.
- Match the sound of several clips before merging them.
Supported formats
- Input: MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WEBM, AIFF and the audio from MP4 or MOV videos.
- Output: MP3 at 128, 192, 256 or 320 kbps, or 16-bit PCM WAV.
- Up to 250 MB per file. The sample rate and channels (mono or stereo) are preserved.
Frequently Asked Questions
How many bands does the equalizer have?
Ten: 32, 64, 125, 250 and 500 Hz, and 1, 2, 4, 8 and 16 kHz, each with a range of ±12 dB.
Can the audio distort if I boost a band a lot?
Not from digital clipping: if the result would go over the maximum, the volume is lowered just enough to keep it from clipping.
Is my audio uploaded to a server?
No. Your audio is read, processed and converted right in your browser using the Web Audio API. The file is never uploaded to a server and never leaves your device.
Is it free?
You get one free try per tool: one audio file. You can reprocess that same file with different settings as many times as you like, but to process a new file you need ToolStudio Pro, which gives you unlimited use of every tool, batch processing (several files at once, downloaded together in a ZIP) and no ads. You can cancel anytime.
