De-Esser Online
Tame harsh sibilance in any audio file in your browser. One click, no calibration — clean vocals, podcasts, and voiceovers in seconds.
De-Ess Audio in 2 Steps
No knobs, no listening tests. Just drop your file and download.
Upload Your Audio
Drag and drop an MP3, WAV, or other audio file. Files up to 200 MB.
De-Ess & Download
Hit De-Ess & Download. A targeted notch tames the sibilance and you get a clean 192 kbps MP3.
Why Notevibes De-Esser
Honest, focused, built to protect what your vocals already sound like.
Targeted Sibilance Cut
A high-Q peaking filter at 6 kHz with −6 dB of gain reduction. Tames hissy 'S' and 'T' sounds without dulling the rest of the high-end.
One-Click Result
No knobs, no calibration, no listening tests. Drop a file and the de-essed MP3 lands in your downloads in seconds.
Privacy First
Audio is processed locally in your browser using the Web Audio API. Nothing is uploaded, stored, or tracked.
Any Audio Format
Drop an MP3, WAV, M4A, FLAC, OGG, or AAC file up to 200 MB. Anything your browser can decode will load.
Clean MP3 Output
The de-essed file is encoded as a 192 kbps MP3 and saved straight to your device — no watermark, no ads, no attribution.
Works on Mobile
De-ess audio on phone or tablet. Runs on iOS, Android, Chrome, Firefox, Safari, and Edge — upload, process, download.
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 de-essing immediately
No Tracking
We never see your audio
When to De-Ess
Most files process in under a second.
Podcast vocals
Soften harsh S sounds in close-mic'd interviews and solo episodes
Audiobook narration
Cleaner sibilance for long-form narration that won't fatigue the listener
Voiceover work
Polish commercial reads, tutorials, and explainer voiceovers
ASMR recordings
Tame whispered T and S consonants without losing the breathiness
After EQ boosts
Counter the harshness that high-shelf or presence boosts can amplify
TTS cleanup
Polish synthetic speech that comes out a little hot in the high-end
Need Full Vocal Cleanup?
The Notevibes Audio Editor stacks de-esser with EQ, compressor, noise gate, limiter, and more — all in your browser. Process whole podcast episodes in one pass.
Open Full Audio EditorFrequently Asked Questions
What is a de-esser?
A de-esser is an audio tool that reduces harsh sibilant sounds — the hissy 'S', 'T', 'Z' and 'Sh' consonants in vocals. It works by cutting a narrow band of frequencies around 5–8 kHz where sibilance lives, without affecting the rest of the high-end so the voice still sounds bright and natural.
How does this de-esser work?
It applies a peaking filter centered at 6 kHz with a Q of 4 and −6 dB of gain reduction. That narrow notch suppresses the sibilance band while leaving frequencies above and below it untouched, so vocals stay clear without sounding muffled or boxy.
When should I use a de-esser?
Whenever you hear harsh, hissy 'S' or 'T' sounds in a recording — common with close-mic'd vocals, podcasts, voiceovers, and audiobook narration. It is especially helpful after EQ boosts in the high-end, which tend to amplify sibilance.
Will it muffle my vocals?
No. The cut is narrow enough (Q = 4) that it only removes the harsh 6 kHz band. Brightness, presence, and air sit above and below that notch and pass through untouched. If you want a wider treble cut, use the Treble Boost tool with a negative gain instead.
Is the de-esser free?
Yes. Completely free with no sign-up, no watermark, no ads, and no limits on how many files you can process. Max file size is 200 MB.
Is my audio file uploaded to a server?
No. The de-esser 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, tap De-Ess & Download — the cleaned file is saved straight to your phone.
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. Step-by-step guide.