01Phase 01
1. Sibilance Detector (Sidechain)
The channels are summed to mono and band-passed from the chosen frequency up to 1.8× (for example 5.5–9.9 kHz). A 1 ms attack / 60 ms release envelope follower tracks how loud each “s”, “sh” and “t” is.
Split-Band Dynamic De-Esser
De-Esser Online
Reduce harsh “s”, “sh” and “t” sounds in voiceovers, podcasts and vocals. A split-band dynamic de-esser turns down only the sibilance band when it crosses your threshold, and a Removed solo lets you hear exactly what is taken out. Runs in your browser with WAV export.
De-Esser
Runs locally in your browserReady
Drop an audio or video file here
WAV, MP3, M4A, FLAC, OGG, MP4, MOV or WebM. Decoded in your browser, never uploaded.
Choose file
100% browser-local processing · No files uploaded to any server
Acoustic Engineering Guide · Architecture
How this tool works in browser memory
How this tool decodes, analyzes, and masters your dialogue locally with zero cloud latency.
02Phase 02
2. Split-Band Gain Reduction
A 4th-order Linkwitz-Riley crossover splits the voice at the same frequency. When the detector crosses your threshold, only the high band is turned down (5:1, capped at the max reduction you set). The low band with the body of the voice is left alone.
03Phase 03
3. A/B, Removed-Only Solo and WAV Export
Switch between Original, Processed and Removed to hear exactly what is being taken out, check the max-reduction readout, then download the result as a 16-bit PCM WAV file.
Connected finishing workflows
Explore companion utilities for dialogue cleanup, speech pacing, and mastering.
Mouth Sound Remover
Repair saliva clicks and lip smacks, the other common voiceover distraction.
Studio Voice Enhancer
Rumble cut, presence EQ, de-essing and loudness in one voice chain.
LUFS Meter
Check integrated loudness and true peak of the de-essed file before delivery.
Audio Standards & Research
Engineering guides & deep-dive workflows
Explore the acoustic principles, ITU-R loudness standards, and pacing techniques behind this tool.
Studio Voiceover8 min read
How to Make Bedroom Voiceovers Sound Like Broadcast Studio Quality
The 6-stage studio mastering chain: 80Hz rumble cut, 200Hz warmth, 3.5kHz clarity boost, downward room expansion, de-essing, and True-Peak limiting.
Audio Compression8 min read
Voice Recording Compression Settings: Ratios, Attack, and Release for Speech
Optimum compressor settings for dialogue: why 2:1–4:1 ratios with 20ms attack and 150ms release preserve consonants and smooth vocal dynamics.
Recording Technique7 min read
How to Make a Voice Recording Sound Clearer Before You Start Editing
The source-first clarity framework: capsule proximity, 45-degree plosive deflection, reflection absorption, and 24-bit headroom management.
Frequently Asked Questions
Common Questions & Technical Clarifications
How does this online de-esser work?+
It is a split-band dynamic de-esser. A detector listens to the sibilance band and, whenever it crosses the threshold, turns down only the frequencies above the crossover for as long as the “s” lasts. Everything is processed locally in your browser.
What settings should I start with?+
Start with the defaults: threshold −30 dBFS, max reduction 6 dB, frequency 5.5 kHz. Lower the threshold until the readout shows a few dB of reduction on harsh “s” sounds. Around 4–6 kHz suits most lower voices and 6–8 kHz most higher voices. Keep max reduction around 4–8 dB so speech does not start to sound lispy.
How do I know I am not overdoing it?+
Click Removed to hear only what the de-esser takes out. You should hear short “s” and “sh” bursts, not whole words. If you hear vowels, or the voice starts to sound dull or lispy, raise the threshold or lower the max reduction.
Does it change the rest of my audio?+
Below the threshold no gain reduction is applied, and the low and high bands of the crossover add back up to a flat response, so the level of non-sibilant sound stays the same. The crossover adds a small phase shift around the split frequency, which is normal for split-band de-essers.
Is my audio uploaded anywhere?+
No. Decoding, de-essing and WAV encoding all run in your browser. You can drop audio files or videos; the soundtrack is processed and exported as a WAV file.