Free Sound Optimizer & Audio Enhancer

Shape the tone, even out the volume and set the final level of a recording in your browser, with live loudness and peak meters, then export it as a WAV file.

Online Audio Mastering & Enhancement Tool

EQ, filters, a compressor, a noise gate, fades and level meters on one page. Everything runs in your browser, so your audio never leaves your device.

What Is the Sound Optimizer?

The Sound Optimizer is a small mastering chain for finished recordings. When you open a file, it measures the integrated loudness in LUFS, the peak level and an estimate of the tempo (BPM). You can then remove rumble and hiss with the Low Cut and High Cut filters, balance the tone with a 3-band EQ (Bass, Mid and Treble), quieten the pauses with the noise gate, soften harsh S sounds with the de-esser, even out the volume with the compressor and set the final level with Volume / Gain. Fades, speed, pitch and an 8D auto-pan effect are there when you need them. While the audio plays, the meters show loudness and peak after your changes, so you can see what every slider does.

How to Enhance Audio Quality

Press Play and adjust the sliders while you listen. These settings are good starting points:

  • Rumble and handling noise: set Low Cut to 80–100 Hz for voice recordings.
  • Dull or muffled voice: boost Treble by 2 to 4 dB. If S sounds become harsh, raise the De-Esser to 30–50%.
  • Hiss in the pauses: raise the Noise Gate slowly, usually to somewhere between -60 and -45 dB, and stop before quiet word endings get cut off.
  • Uneven volume: set the Compressor Threshold to around -24 dB and the Compression Ratio to 3:1 or 4:1.
  • Too quiet: raise Volume / Gain until the loudness reading is close to your target, and keep Peak below -1 dB.

Spotify and YouTube play music back at about -14 LUFS, and Apple Podcasts recommends about -16 LUFS, with true peaks at or below -1 dBTP. The Peak meter here shows sample peaks, so check the exported file in the LUFS & Peak Analyzer if you need the true peak value.

For a step-by-step walkthrough with example settings, read the guide How to Use the Sound Optimizer Tool.

Who Is It For?

It is made for podcasters and voice-over artists who want a clear, even voice, for musicians and beatmakers preparing a track for streaming, and for video editors who need consistent loudness, all without installing a digital audio workstation (DAW).

How to Optimize Your Audio in 3 Steps

Step 1

Open Your Audio

Choose an audio file from your device. MP3, WAV, FLAC and M4A work in all modern browsers; OGG depends on your browser.

Step 2

Adjust the Sound

Press Play and move the EQ, compressor and noise gate sliders while you watch the loudness and peak meters.

Step 3

Export as WAV

Choose the channels and sample rate, then click Download Audio (WAV).

Select Audio File

Drag and drop a file here or choose one from your device. Supported formats: MP3, WAV, FLAC, M4A and OGG (OGG depends on your browser).

Editing Studio

Tempo (BPM)

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Loudness (LUFS) LIVE

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Max: --

Peak (dBFS) LIVE

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Max: --

Your waveform will appear here after you choose a file.

Time: 00:00 / 00:00
sec
sec
Tip: Need to cut out unwanted parts first?
Open Audio Trimmer

Real-Time Effects & EQ

LUFS: -- Max: --
Peak: -- Max: --
Mastering tip: Spotify and YouTube play music back at about -14 LUFS; keep peaks at or below -1 dB. If raising Volume / Gain pushes Peak above 0 dB, first lower the Compressor Threshold and raise the Compression Ratio to even out the loudest moments.

Advanced EQ & Filters

Export Settings

Export Edited Audio

Tip: Need an MP3? Export a WAV here, then convert it.
WAV to MP3 Converter

The file is exported as a 16-bit WAV. If peaks would go above 0 dB, the overall level is lowered automatically to -1 dB. To check the true peak (dBTP), open the exported file in the LUFS & Peak Analyzer.

Audiogram Maker

Want to share your audio as a video? The Audiogram Maker turns it into an MP4 with a moving waveform for social media.

Frequently Asked Questions

Is the Sound Optimizer really free?
Yes. The Sound Optimizer is free to use, with no sign-up and no daily limits. You can process as many files as you like.

Are my audio files safe and private?
Yes. Analysis, effects and export all happen in your browser on your own device. Your audio files are never uploaded to our servers.

What does the Sound Optimizer do?
It puts the steps most recordings need on one page: Low Cut and High Cut filters, a 3-band EQ, a noise gate, a de-esser, a compressor, volume and fades, plus optional speed, pitch and 8D effects. Live meters show the loudness in LUFS and the peak level while you listen, and the result is exported as a WAV file.

How do I make my audio louder without clipping?
Lower the Compressor Threshold and set the Compression Ratio to around 3:1 so the loudest moments are evened out, then raise Volume / Gain while watching the Peak meter and keep it at or below -1 dB. If the export would still go above 0 dB, the tool lowers the overall level automatically so the file doesn’t clip.

What LUFS should I aim for on Spotify, YouTube and podcasts?
Spotify and YouTube play music back at about -14 LUFS, and Apple Podcasts recommends about -16 LUFS. Keep true peaks at or below -1 dBTP. After exporting, you can confirm the values in the LUFS & Peak Analyzer.

Can it fix audio that is already clipped?
No. Distortion that was recorded into the file can’t be undone here. The tool helps you avoid new clipping: the Peak meter turns red when the level goes above 0 dB, and the export lowers the level when needed. For a clean result, record again with a lower input level.

How do I reduce background noise in a recording?
Set Low Cut to 80–100 Hz to remove rumble, then raise the Noise Gate until the pauses are quiet. A gate silences the gaps between phrases; it can’t remove noise underneath the voice. For a separate gate and de-esser, use the Noise Gate & De-Esser.

Can I change the speed and pitch of a track?
Yes. Speed and Pitch both work by resampling, so tempo and pitch change together, like a record played faster or slower. To change them separately, use the Pitch & Speed Changer.

Will I lose audio quality after exporting?
The export is an uncompressed 16-bit WAV file, so no extra compression is added. If your settings would push peaks above 0 dB, the tool lowers the overall level slightly to prevent clipping.

Do I need to install any software?
No. The Sound Optimizer runs in your web browser on computers, phones and tablets, so you don’t need to install a digital audio workstation (DAW) or plugins. For careful listening, use headphones.

Can I process copyrighted music?
Please use the tool with audio you own or have permission to use, such as your own recordings, podcasts, voice-overs and royalty-free music. Publishing edits of someone else’s songs usually requires permission from the rights holder.