Treble Booster Online
Add air, clarity, and presence to any audio file in your browser. Pick from +3 to +12 dB high-shelf — instantly get a brighter MP3.
Boost Treble 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 bright tracks.
Boost & Download
Hit Boost Treble & Download. A 192 kbps MP3 with brighter high-end is saved.
Why Notevibes Treble Booster
Calibrated high-shelf, mids untouched.
4 Boost Presets
Pick +3, +6, +9, or +12 dB with one click. Calibrated high-shelf at 8 kHz so mids stay natural.
Instant Result
OfflineAudioContext renders the shelf 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.
Clean MP3 Output
192 kbps MP3 saved straight to your device — no watermark, no ads.
Works on Mobile
Boost treble on any phone or tablet. iOS, Android, all major browsers.
Your Audio Stays on Your Device
Every file is processed locally in your browser using the Web Audio API. Nothing is uploaded.
No Upload
File never leaves your device
No Account
Start boosting immediately
No Tracking
We never see your audio
When to Boost Treble
Most files process in under a second.
Dull voice memos
Add intelligibility to muffled phone or dictaphone recordings
Old MP3 rips
Brighten low-bitrate or aged audio files
Audiobook narration
Add presence to vocals that lack air
Acoustic instruments
Bring out string detail, finger noise, cymbal shimmer
Podcast voiceovers
Sharpen consonants for clarity over speakers
Lo-fi mixes
Add sparkle to overly warm or muddy tracks
Need Full Tone Shaping?
The Notevibes Audio Editor stacks treble boost with bass, EQ, compression, limiter, and effects — process whole tracks in one pass.
Open Full Audio EditorFrequently Asked Questions
How does the treble booster work?
It applies a high-shelf filter at 8 kHz — every frequency above the shelf is lifted by your chosen amount (+3, +6, +9, or +12 dB). The shelf rolls off smoothly so the mids stay natural and only the high-end gets brighter.
When should I boost treble?
Boost treble when audio sounds dull or muffled — common with old recordings, phone calls, dictaphones, or low-bitrate MP3s. Treble adds air and intelligibility, especially helpful for spoken-word and acoustic instruments.
Will it cause harshness or sibilance?
Mild boosts (+3, +6 dB) are safe on most material. +9 to +12 dB can amplify hiss or sibilant "S" sounds — if that happens, run the result through the Notevibes De-Esser to tame the harshness while keeping the brightness.
Is the treble 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 treble booster runs entirely in your browser using the Web Audio API. Your file never leaves your device.
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 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.
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.