Speech Restorer — Fix Unintelligible Audio

Free browser-based speech restorer that turns unintelligible recordings into clear, listenable audio. Upload a bad recording — the tool auto-detects problems and applies multi-stage AI processing including noise removal, bandwidth extension, and speech enhancement. All processing happens locally in your browser.

How to Use

1
Upload your audio

Drag and drop or browse for your degraded audio file (MP3, WAV, FLAC, OGG, M4A, up to 1 GB)

2
Review diagnosis

The tool automatically analyzes your audio and shows detected problems — noise, bandwidth, clipping, dynamics, reverb

3
Choose preset and intensity

Select the preset that matches your recording type, or use Auto. Adjust intensity from Light to Maximum

4
Restore and compare

Click Restore Speech, then compare Before/After with the built-in players and spectrum visualization

5
Download result

Download your restored audio in WAV, MP3, FLAC, or OGG format

Recover clarity from degraded phone calls, old recordings, and noisy environments

🔊
Upload audio to restore
Drop your audio file here or browse
Max 1 GB · MP3, WAV, FLAC, OGG, M4A, AAC, WebM
Upload a file to start
🔊
Audio Diagnosis
What type of recording?
🤖
Auto
Automatically detect and fix all problems
📱
Phone Call
Fix phone and VoIP recordings with narrow bandwidth
📼
Old Recording
Restore warmth and clarity to aged tapes and files
🏗️
Noisy
Maximum noise removal for loud environments
🔇
Muffled
Recover clarity from muffled or underwater-sounding audio
🏢
Conference
Clean up meeting and conference room recordings
📻
Radio
Broadcast-ready voice from radio or stream captures
Restoration Intensity
Medium
Light Medium Strong Maximum
🚪Gate
→
🤖NR
→
🏠DeReverb
→
👆DeClick
→
📡BW Ext
→
🎛️EQ
→
📊Comp
→
📏LUFS
→
🛑Limit
Analyzing audio... 0%
Before
0:00
After
0:00
Frequency Spectrum
Before After
Spectrogram
0 Hz1k4k8k16k+
Speech Transcript
Click "Transcribe" to see what the AI can understand from the audio
Quality Score
—
Overall Quality
Playback Speed:

Features

Auto Problem Detection
Analyzes your audio for noise, bandwidth limitations, clipping, poor dynamics, and reverb — then shows a clear diagnosis
AI Multi-Pass Noise Removal
Up to 3 passes of RNNoise neural network processing with VAD-adaptive mixing for maximum noise suppression
Bandwidth Extension
Synthesizes missing high frequencies for phone calls and muffled recordings using harmonic generation
7 Smart Presets
Auto, Phone Call, Old Recording, Noisy, Muffled, Conference, and Radio — each optimized for specific degradation types

FAQ

What types of audio can this tool restore?

Phone call recordings, old cassette/VHS tapes, conference room recordings, noisy environment captures, muffled or underwater-sounding audio, and any speech that is difficult to understand due to degradation.

How does bandwidth extension work?

Phone calls and old recordings often have limited frequency range (e.g., 300-3400 Hz). Bandwidth extension generates natural-sounding harmonics to fill in the missing high frequencies, making speech clearer and more natural.

What does multi-pass noise removal mean?

For severely degraded audio, the tool runs the AI noise removal algorithm multiple times (up to 3 passes), with decreasing strength each pass to avoid artifacts while maximizing noise suppression.

Can I use this for legal or forensic audio?

This tool is designed for general speech clarity improvement. For forensic or legal purposes, always work with the original unprocessed file and consult a professional audio forensics expert.

What is the maximum file size?

Up to 1 GB. Since all processing happens in your browser, very large files may be slower depending on your device performance. For best results, trim your file to the relevant section first.

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Who is this tool for?
🎙️ Podcasters 🎛️ Sound Engineers 📡 Streamers & Broadcasters 📖 Audiobook Narrators
Published Updated Authors: