High-frequency detail
Free Online Treble Booster
Boost or reduce treble for dark voice recordings, flat mixes, cymbals, acoustic detail, and general brightness control. Everything runs locally in the browser with FFmpeg.
Useful for private voice takes, rough mixes, and draft uploads because the audio stays on your device.
Uses FFmpeg treble filtering on the upper range instead of rough one-click brightness tricks.
A quick way to brighten dull files or soften overly harsh highs without opening a larger editor.
Drag & drop audio here, or click to upload
Supports MP3, WAV, M4A, FLAC, OGG, AAC, and more
How to use the Treble Booster online
- 1.Upload an audio file and let the browser read its duration and sample rate.
- 2.Set the treble gain in dB to brighten the file or cut harsh top end, then preview the result.
- 3.Choose MP3 or WAV export, process the file in the browser, preview the result, and download it.
Why use this Treble Booster?
Useful for dull or harsh recordings
Bring back clarity in muted files or tame brittle highs in bright captures and rough exports.
Private browser workflow
FFmpeg runs locally on your device, so source files stay off external servers during processing.
Flexible output
Export MP3 for quick sharing or WAV if you want to keep editing the result afterward.
Common use cases
- •Brighten a dull narration file before sending it to a video editor.
- •Soften aggressive cymbals or brittle acoustic guitar in a quick demo export.
- •Add more presence to a phone recording that sounds dark or boxed in.
- •Reduce hiss emphasis by trimming the top end slightly instead of using a heavy denoiser.
Tips for better results
- •Small moves such as +2 dB to +5 dB are often enough to restore clarity.
- •If speech already sounds sibilant, try a small negative value before stacking more processing.
- •Use WAV for follow-up mastering or additional EQ moves after the treble pass.
Treble Booster FAQ
Will this remove sibilance completely?
No. It adjusts the overall high-frequency range, so it can soften harshness, but it is not a dedicated de-esser.
Is my audio uploaded to a server?
No. The processing happens in your browser, so the source file stays on your device.
Which formats can I upload?
Most common browser-decodable formats are supported, including MP3, WAV, M4A, FLAC, OGG, and many AAC-based files.
When should I export WAV instead of MP3?
Choose WAV if you plan to keep editing or chain more processing afterward. MP3 is better for quick sharing and review.