Chrome
Manual install (ZIP)
Chrome 88 and later on Windows, macOS, Linux and ChromeOS. The bass booster Chrome extension installs in seconds through developer mode.
Download Chrome ZIPfrom GitHubOfficial SonicLab extension · Free · No signup
Bass Booster Extension
The SonicLab Bass Booster extension is a free browser extension that deepens the low end of any audio file you open, right inside your browser. Pick a track, dial in the boost, hear the result instantly, and save the processed audio as a WAV file. Everything happens on your device. Your audio is never uploaded, and the extension requests no browser permissions at all.
Prefer the official browser store when available. ZIP downloads are provided for manual installation, and are the only route while store listings are in review.
Free to useNo permissions requestedAudio stays on your deviceExports 16-bit WAV
Bass Booster extension at a glance
- What it is
- A bass booster extension that deepens the low frequencies of audio files directly in your browser
- Browsers
- Chrome, Microsoft Edge, Opera and Firefox
- Price
- Free, with no account and no signup
- Bass boost range
- 0 to +18 dB, using a low-shelf filter
- Bass frequency range
- 40 Hz to 200 Hz
- Input formats
- MP3, WAV, FLAC, OGG, M4A and AAC, up to 100 MB
- Export format
- 16-bit WAV
- Permissions requested
- None
Choose your browser
Install the Bass Booster extension
Pick your browser below. Where an official store listing exists, install from there — the store handles updates for you and verifies the package. Listings on the Chrome Web Store, Microsoft Edge Add-ons and Opera Add-ons are not published yet, so for now every browser installs from a ZIP hosted on GitHub. This page is updated the moment a listing goes live.
Microsoft Edge
Manual install (ZIP)
Edge is built on Chromium, so the extension runs unchanged.
Download Microsoft Edge ZIPfrom GitHubOpera
Manual install (ZIP)
Opera is Chromium-based and installs the package the same way.
Download Opera ZIPfrom GitHubFirefox
Manual install (ZIP)
Firefox 109 and later. A separate build with Gecko's manifest keys.
Download Firefox ZIPfrom GitHubDownload the Bass Booster extension
Every build is published in the extension's own GitHub repository, where the full source is readable alongside the packages. Each browser gets its own ZIP: the code inside is identical, and only the manifest differs to satisfy each store's requirements.
A ZIP is a download, not an install — after saving it you unzip the file and load the folder through your browser's developer mode. The steps are below.
Download Chrome ZIPDirect download from GitHubDownload Microsoft Edge ZIPDirect download from GitHubDownload Opera ZIPDirect download from GitHubDownload Firefox ZIPDirect download from GitHub
All releases and the complete source: github.com/kaleemullah6698/bass-booster-extension
How to install the Bass Booster extension manually
Manual installation takes about a minute and is the same in every Chromium browser. You only need it while a store listing is unavailable — once the extension is in your browser's store, install it from there instead so you keep automatic updates.
Chrome
- Download the bass booster extension ZIP for your browser using the button above.
- Unzip it. You should end up with a folder containing manifest.json.
- Open chrome://extensions in your browser.
- Turn on Developer mode (the toggle is in the top-right corner of the extensions page).
- Click Load unpacked and select the unzipped extension folder.
- Pin the Bass Booster to your toolbar and click it to open the popup.
Microsoft Edge
- Download the bass booster extension ZIP for your browser using the button above.
- Unzip it. You should end up with a folder containing manifest.json.
- Open edge://extensions in your browser.
- Turn on Developer mode (the toggle is in the top-right corner of the extensions page).
- Click Load unpacked and select the unzipped extension folder.
- Pin the Bass Booster to your toolbar and click it to open the popup.
Opera
- Download the bass booster extension ZIP for your browser using the button above.
- Unzip it. You should end up with a folder containing manifest.json.
- Open opera://extensions in your browser.
- Turn on Developer mode (the toggle is in the top-right corner of the extensions page).
- Click Load unpacked and select the unzipped extension folder.
- Pin the Bass Booster to your toolbar and click it to open the popup.
Firefox
- Download the Firefox ZIP using the button above.
- Open about:debugging#/runtime/this-firefox in Firefox.
- Click Load Temporary Add-on.
- Select the manifest.json file inside the unzipped folder. Firefox requires the file, not the folder.
- The bass booster extension is active until you restart Firefox. Reload it the same way after a restart.
How the Bass Booster extension works
This bass boost extension works on an audio file you open from your own computer, rather than on sound playing in a tab. Click the toolbar icon, choose a track or drag one onto the popup, and the browser decodes it in place. Two controls shape the sound: how much low end to add (up to +18 dB), and the frequency the boost starts from (40–200 Hz).
The boost uses a low-shelf filter rather than a bell curve, which is what separates a true bass boost from a resonant bump — everything below the corner frequency rises together, so sub-bass comes up with the bass instead of being left behind. Playback is live: move a slider while the track is playing and the filters retune under it, so you hear the change immediately rather than waiting for a re-render.
When you are happy with the result, export a 16-bit WAV. The file is rendered through the same filter chain you just listened to at the same output level, so the download is exactly what you previewed.
Features
Bass Booster extension features
Six things this browser audio tool does, and nothing it does not.
Open any local file
Open an audio file from your computer, or drag and drop it straight onto the popup. Nothing is sent anywhere. The file is read by the browser and stays on your machine.
Bass boost up to +18 dB
A low-shelf filter lifts everything below the corner frequency, so sub-bass rises together with the bass instead of being left behind.
Bass frequency, 40–200 Hz
Choose where the boost starts. Lower settings emphasise deep sub-bass and 808s; higher settings add warmth and body.
Instant preview
Play the boosted audio and move the sliders while it is playing. The filters retune live, so you hear each change immediately.
Automatic clipping protection
The extension measures your file and trims the output by exactly enough to keep the boosted peaks below full scale, with a safety limiter behind it. Quiet recordings are never silently normalised.
Export to WAV
Save the processed audio as a 16-bit WAV file. What you download is exactly what you previewed.
Privacy
Private, local audio processing
Local audio processing is not a marketing line here — it is the reason the extension can ask for nothing at all.
Your audio never leaves your device
The file is decoded and filtered by your browser's own audio engine inside the extension popup. It is never uploaded, never sent to a server, and never stored by the extension.
No permissions requested
The extension asks for no browser permissions at all. It cannot see your tabs, your history, or the pages you visit.
No data collection
No analytics, no tracking, no accounts, and no network requests of any kind. The audio you open is released from memory as soon as you close the popup.
Because there is no upload step, there is nothing to wait for and nothing to trust us with. You can read the full privacy policy for the extension or the complete source, which ships unminified inside every package.
Supported audio files
Your browser's own audio decoder handles the file, which in Chrome and Edge covers all of these:
- MP3
- WAV
- FLAC
- OGG
- M4A
- AAC
Files up to 100 MB
Format support is the browser's decision rather than the extension's, so it can vary slightly between browsers — Firefox, for instance, always handles MP3, WAV, FLAC and OGG, while M4A and AAC there depend on the codecs installed on your system. If a file is corrupt or in a format the browser cannot read, the extension says so clearly instead of failing silently.
Bass Booster extension vs SonicLab online Bass Booster
Both run the same audio-processing approach and both process your audio locally. The difference is where they live and how much control they give you.
| Feature | Browser extension | Online Bass Booster |
|---|---|---|
| Where it runs | In a browser popup, offline once installed | On the SonicLab website, nothing to install |
| Bass controls | Bass boost and bass frequency | Bass boost, bass frequency, mid balance and high balance |
| Presets | None, the two controls are adjusted by hand | Five presets, including Deep Bass and Subwoofer |
| Waveform view | Not shown | Yes |
| Export formats | WAV | WAV and MP3 |
| Audio processing | Local, in your browser | Local, in your browser |
Choose the bass boost extension if you boost bass often and want it one click away in your toolbar — it works offline once installed and needs no tab to be open. If you would rather not install anything, or you want the presets, the waveform view and MP3 export, you can try the online Bass Booster instead — it runs in the same browser with nothing to set up.
Frequently asked questions
What is the SonicLab Bass Booster extension?
The SonicLab Bass Booster extension is a free browser extension that boosts the low frequencies of an audio file you open from your computer. You set the amount of boost (up to +18 dB) and the frequency it starts from (40–200 Hz), preview the result instantly with live playback, and export the processed audio as a 16-bit WAV file. All processing happens on your own device. Your audio is never uploaded.
How do I install the bass booster extension?
Install from your browser's official store when a listing is available. That is the simplest and safest route. While no store listing exists, download the ZIP for your browser using the button on this page, unzip it, and load it through your browser's developer mode using the step-by-step instructions on this page.
Is there a bass booster Chrome extension?
Yes. The bass booster Chrome extension is available as a direct ZIP download from the SonicLab GitHub repository and installs through Chrome's Load unpacked option in developer mode. The same Chromium build also runs unchanged in Microsoft Edge and Opera.
Where can I download the Bass Booster extension ZIP?
Each browser has its own ZIP package hosted on the SonicLab GitHub repository. The download buttons on this page link directly to the correct file for each browser. Chrome, Microsoft Edge, Opera and Firefox each have a separate build.
Does the Bass Booster extension upload my audio?
No. Your audio is never uploaded, never sent to a server, and never stored by the extension. It requests no browser permissions, makes no network requests, and releases the audio from memory as soon as you close the popup.
What audio formats does the extension support?
Your browser's own audio decoder handles the file. In Chrome and Edge this covers MP3, WAV, FLAC, OGG, M4A and AAC up to 100 MB. Firefox always handles MP3, WAV, FLAC and OGG; M4A and AAC there depend on installed system codecs. If a file is unsupported, the extension says so clearly instead of failing silently.
Can I use the Bass Booster extension with MP3 files?
Yes. MP3 is supported for input in all four browsers. The processed audio is exported as a 16-bit WAV file. If you need MP3 export, the online SonicLab Bass Booster supports both WAV and MP3 output.
What is the difference between the extension and the online SonicLab Bass Booster?
Both tools process audio locally in your browser and neither uploads your files. The bass boost extension lives in your toolbar and offers two controls, bass boost and bass frequency, with WAV export. The online Bass Booster adds mid and high balance controls, five presets (including Deep Bass and Subwoofer), a waveform view and MP3 export, and needs no installation at all.
What does "bass boosted extension" mean?
A bass boosted extension is another way of describing a browser extension that applies a bass boost effect to an audio file. The SonicLab extension boosts the low end by up to +18 dB using a low-shelf filter, so the output audio is effectively bass boosted before you save it.
Is "bass booster extention" the same as "bass booster extension"?
Yes. "Extention" is a common misspelling of "extension". The SonicLab Bass Booster extension is the tool you are looking for either way. It is available as a free download for Chrome, Microsoft Edge, Opera and Firefox.
More free browser audio tools
SonicLab is a collection of free browser-based audio tools that process your files on your own device — no uploads, no accounts, no signup.