Free tools for your next audio edit
Free audio equalizer. Shape the sound, then compare.
Adjust four frequency bands in a short MP3 or WAV. Preview the actual WAV or MP3 export against your original and download it. Processing is free and stays in your browser.
Equalize audio
Free · localNo file selected. Audio stays in this browser.
Applies four fixed-frequency peaking filters independently to each channel. No normalization, limiter or source separation. Phase and startup transients can change; boosts can cause clipping. Download before leaving and keep your original.
Make a careful comparison
How to equalize an audio file online
Start with the original and listen at a similar level. A louder result is not necessarily a clearer one.
- 01 / OPEN
Choose a representative clip
Open a mono or stereo MP3 or WAV up to 50 MiB and five minutes. Include the passage you want to improve and a quiet section for comparison.
- 02 / ADJUST
Change one band at a time
All bands start at 0 dB. Try a small boost or cut, then prepare and compare the export. The bands overlap, and each affects the whole recording.
- 03 / REVIEW
Listen and download
Choose WAV or MP3, prepare the result, and compare the two players. Download the same file used by the preview. Changing a setting clears the result; the next pass starts from the original.
Four fixed bands
What the equalizer changes
The 100 Hz band affects low bass, 500 Hz low mids, 2 kHz upper mids and 8 kHz high frequencies. These are center frequencies rather than hard boundaries: each peaking filter changes a range around its center. The four filters use a fixed Q of 1 and gains from −12 to +12 dB. Their ranges overlap, so the combined curve depends on all settings.
Start with small changes and compare speech, music and background sound together. For a voice, cutting a little low-mid energy may reduce muddiness, while too much can make it thin. Boosting highs may reveal consonants but also raise hiss or sibilance. No preset works for every source; the vocal EQ guide explains a listening workflow.
The filter applies the same coefficients independently to each channel. It changes phase and can produce startup transients; it does not separate sources, repair clipping or apply a limiter. Its peaking filters use the W3C Audio EQ Cookbook equations.
Check the actual file
Export and clipping
Audio is decoded locally at 48 kHz. WAV is 16-bit PCM, and MP3 is a new lossy encode at 128, 192 or 320 kbps. MP3 can add delay or padding; choose WAV for an editable timeline replacement. Source tags, artwork and original encoded bytes are not preserved. Both formats must fit 50 MiB.
Boosts can push samples beyond full scale. The tool counts samples clipped during PCM preparation; if the count is nonzero, lower the source level in an editor before retrying. The count is not a true-peak or decoded MP3 peak measurement. Keep the original and check the finished export.
For rumble alone, compare the high-pass filter. For a voice overlapping music or other sounds, voice isolation is a separate service with its own account and credit requirements.
MP3 encoder credits
Built with the LAME encoder via lamejs.
The optional MP3 download uses lamejs 1.2.1 by Alex Zhukov, a JavaScript port of the LAME MP3 encoder. Its unmodified script is served separately. See the attribution and source notes, upstream license notice, LGPL-3.0 and GPL-3.0 texts, and complete upstream source package.
A few useful answers
Free audio equalizer questions
How do I equalize audio online?
Choose a mono or stereo MP3 or WAV up to 50 MiB and five minutes. Adjust the four band gains, choose WAV or MP3, and prepare the result. Listen to the original and the actual export before downloading. Processing is local and free.
What do the four bands do?
Each band boosts or cuts a range around 100 Hz, 500 Hz, 2 kHz or 8 kHz, with fixed Q of 1. Neighboring ranges overlap. These are broad changes to the whole recording, not isolated instruments or voice-only adjustments.
Can equalization remove background noise or isolate a vocal?
EQ changes all sounds in each affected frequency range. A cut can reduce some noise but also changes wanted audio at those frequencies. It does not identify or separate individual sources.
Why does my result clip?
Boosting a band can raise peaks beyond the available range. The tool reports out-of-range samples during PCM preparation; lower the source level before retrying if this occurs. The count is not a true-peak or decoded MP3 peak measurement.
What is in the download?
WAV is 48 kHz 16-bit PCM; MP3 is a new lossy encode at the selected bitrate and may add delay or padding. The decoded frame count and mono or stereo channel layout are retained before encoding. Tags and artwork are not copied. The actual export must fit 50 MiB.
Is my audio uploaded?
The selected file is decoded and processed locally in the browser. No audio is uploaded for this equalizer. Download your result before leaving the page and keep the original.
After preparing your audio