Bass Booster Online
Add weight and depth to any audio file in your browser. Pick from +3 to +12 dB low-shelf — instantly get a deeper MP3, no sign-up, no upload.
Boost Bass in 3 Steps
No knobs, no listening tests. Drop, pick, download.
Upload Your Audio
Drag and drop an MP3, WAV, or other audio file. Up to 200 MB.
Pick a Boost Preset
Tap +3, +6, +9, or +12 dB. Start lower for already bass-heavy tracks.
Boost & Download
Hit Boost Bass & Download. A 192 kbps MP3 with deeper low-end is saved to your device.
Why Notevibes Bass Booster
Calibrated low-shelf, mids untouched.
4 Boost Presets
Pick +3, +6, +9, or +12 dB with one click. Calibrated low-shelf at 100 Hz so mids and vocals stay clear.
Instant Result
The shelf is rendered through OfflineAudioContext in seconds. Drop, pick, download.
Privacy First
Audio is processed locally in your browser using the Web Audio API. Nothing is uploaded.
Any Audio Format
MP3, WAV, M4A, FLAC, OGG, AAC up to 200 MB. Anything your browser can decode loads.
Clean MP3 Output
192 kbps MP3 saved straight to your device — no watermark, no ads, no attribution.
Works on Mobile
Boost bass on your phone or tablet. iOS, Android, Chrome, Firefox, Safari, Edge.
Your Audio Stays on Your Device
Every file is processed locally in your browser using the Web Audio API. Nothing is uploaded, stored, or analyzed.
No Upload
File never leaves your device
No Account
Start boosting immediately
No Tracking
We never see your audio
When to Boost Bass
Most files process in under a second.
Tinny phone recordings
Add the low-end your phone mic couldn't capture
Car audio prep
Boost bass for car stereos with weak low-end response
Music for laptops
Compensate for laptop speakers that lose bass
Podcast voice depth
Add chest/warmth to thin male and female voiceovers
Bluetooth speakers
Pre-boost bass for small speakers without a sub
Hip-hop / EDM mixes
Push the sub for tracks where the bass feels weak
Need Full Tone Shaping?
The Notevibes Audio Editor stacks bass boost with treble, EQ, compression, limiter, and effects — process whole tracks in one pass.
Open Full Audio EditorFrequently Asked Questions
How does the bass booster work?
It applies a low-shelf filter at 100 Hz — every frequency below the shelf is lifted by your chosen amount (+3, +6, +9, or +12 dB). The shelf rolls off smoothly so the mids stay clear and only the low-end gets weightier.
What does the dB value control?
The dB value is how much louder the bass becomes. +6 dB roughly doubles the perceived bass energy. +12 dB is heavy — fine for tinny phone recordings or laptop speakers, but can sound boomy on already bass-heavy music.
Will it muddy my mix?
Not significantly. The shelf is centered at 100 Hz, which mostly affects sub-bass and low-bass — below where vocals and most instruments live. For very bass-heavy tracks, start with +3 dB.
Is the bass booster free?
Yes. Completely free with no sign-up, no watermark, and no limits. Max file size is 200 MB.
Is my audio file uploaded to a server?
No. The bass booster runs entirely in your browser using the Web Audio API. Your file never leaves your device — nothing is uploaded, stored, or analyzed.
What audio formats are supported?
MP3, WAV, M4A, FLAC, OGG, and AAC. Anything your browser can decode via the Web Audio API will load. The processed output is exported as a 192 kbps MP3.
Does it work on mobile?
Yes. It runs on Chrome, Firefox, Safari, and Edge on both desktop and mobile. Tap to upload, pick a dB preset, tap Boost & Download.
Can I create audiobooks with Notevibes?
Yes. The AI audiobook generator turns your EPUB, Kindle, or PDF into a narrated audiobook with character detection, 550+ voices, and ACX-compliant volume normalization built in.