Free Audio and Voice Enhancer Online
Polish voiceovers, podcast recordings, interviews, and lectures with broadcast presence EQ, noise floor expansion, de-essing, and -16 LUFS loudness leveling. Zero cloud uploads, files up to 1 GB on desktop.
Audio & Voice Enhancer Studio
Vocal Mastering Profiles
Click to switch sound characterChoose a voice recording or drop it here
MP3, WAV, M4A, AAC, FLAC, MP4, MOV, or WebM (up to 1 GB)
100% Free Forever · Zero Server Uploads · 32-Bit Float Web Audio DSP
100% browser-local processing · No files uploaded to any server
Engineered for authentic vocal nuance
Why audio professionals and podcast creators choose transparent 32-bit DSP over robotic cloud voice synthesizers.
32-Bit Float DSP
Ultra-high dynamic range processing eliminates digital quantization distortion and phase smearing.
100% Client Privacy
Zero cloud uploads. Confidential recordings, client interviews, and unreleased podcasts stay strictly on your machine.
Seamless A/B Audition
Instantly compare raw input against studio master during live playback with micro-faded stream switches.
Soft Peak Limiter
Sample peaks above -1 dBFS are soft-clipped so boosted speech does not hard-clip. It is a sample-peak limiter, not an oversampled true-peak limiter.
The 6-Stage Studio DSP Mastering Chain
Transparent acoustic signal processing that enhances authentic vocal character without synthetic artifacts.
Sub-Rumble & Mains Hum Cut
2nd-order Butterworth high-pass filter stripping sub-80Hz handling noise and HVAC rumble, paired with dual 50Hz/60Hz notch filters for electrical grounding hum.
Ambient Downward Expander
Smoothly attenuates stationary background hiss and room reflections during dialogue pauses without creating unnatural gating pumping artifacts.
3-Band Vocal Presence EQ
Injects 200Hz low-mid chest warmth, a calibrated 3.5kHz peaking boost for speech consonant intelligibility, and 10kHz high-shelf air sheen.
Dynamic Spectral De-Esser
Frequency-selective compression between 5.5kHz–8kHz that gently tames harsh sibilance ('s', 'sh', and 't' sounds) without dulling vocal brilliance.
Saliva Pop Transient Repair
Pinpoints rapid micro-transient spikes and repairs corrupted waveform intervals with Catmull-Rom cubic spline interpolation.
Loudness Leveler & Soft Peak Limiter
Levels loudness toward delivery targets (-16 LUFS podcast / -14 LUFS video) using a simplified loudness estimate without K-weighting, then soft-clips sample peaks above -1 dBFS.
Tailored Audio Enhancement Profiles
How different voice professionals use our dedicated mastering presets.
Podcasts & Interviews
Use the Podcast Master preset to add chest warmth (200Hz) and bring voices forward to -16 LUFS for Apple Podcasts and Spotify compliance.
Meetings & Lectures
Meeting Clarity cuts laptop fan hiss, aggressive low-end rumble, and boosts 2.8kHz presence for crystal clear consonant comprehension.
Voiceover & Narration
Crisp Voiceover provides modern 11kHz air sheen and de-essing to deliver high-definition audio book and YouTube narration.
Connected Dialogue Finishing Tools
Combine vocal enhancement with precision silence cutting, noise cleaning, and loudness leveling.
Engineering guides & deep-dive workflows
Explore the acoustic principles, 6-stage studio mastering chain, and vocal clarity best practices.
Audio Enhancer vs Noise Remover: What Each Can—and Cannot—Fix
Compare audio enhancers and noise removers across dialogue issues. Learn when EQ helps and why an enhancer on a noisy track worsens the noise floor.
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.
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
Everything you need to know about browser-local audio mastering.
How does the Audio Enhancer improve voice recordings?+
AutoSilenceCut runs a 6-stage studio DSP mastering chain directly in your browser: 1) Sub-rumble & mains hum isolation, 2) Downward ambient noise expansion, 3) 3-band psychoacoustic vocal presence EQ, 4) Dynamic spectral de-essing, 5) Mouth saliva click de-noising, and 6) Loudness leveling toward the profile's LUFS target (a simplified estimate without K-weighting) followed by a soft peak limiter.
How does this compare to cloud enhancers like Adobe Podcast Enhance?+
Cloud tools such as Adobe Podcast and Descript require an account and upload your recording to their servers for processing, often with generative models. AutoSilenceCut processes 100% locally in your browser with transparent DSP (32-bit float internally, exported as 16-bit WAV), so your audio never leaves your device and no speech is resynthesized.
Can I adjust the enhancement intensity?+
Yes. The Master Polish Strength slider lets you dial in anywhere from 0% (dry raw audio) to 100% (maximum broadcast master). It defaults to a calibrated 75% Studio Polish for natural vocal warmth and clarity.
Are my audio recordings uploaded to any cloud server?+
No. All DSP filtering, loudness analysis, and WAV master rendering take place 100% client-side inside your browser via the Web Audio API. Zero media bytes ever leave your device.
What file formats can I enhance?+
You can enhance MP3, WAV, M4A, FLAC, OGG, AAC, MP4, MOV, and WebM voice and video recordings up to 1 GB on desktop (250 MB on mobile).
Complementary Voice & Audio Tools
Connect studio mastering with noise reduction, de-clicking, and natural silence editing.
Background Noise Remover
Filter out 80Hz rumble, electrical hum, and desk vibrations during pauses.
Audio Volume Normalizer
Balance loudness to -16 LUFS podcast and -14 LUFS YouTube broadcast standards.
Mouth De-Clicker & Pop Repair
Detect and repair saliva clicks and mouth pops with cubic spline interpolation.
Remove Silence from Audio
Shorten quiet pauses with calibrated 0.32s speech breathing cushions.
De-Esser
Adjustable split-band de-esser for harsh S sounds, with a listen-to-removed solo.