🎵 AudioTools.dev

Free open source audio processing ecosystem — audiotools.dev

Privacy-first audio tools that run entirely in your browser. No uploads, no accounts, no tracking.

Online Tools

Tool	URL	Technology
Audio Converter	/converter/	Web Audio API + lamejs + Go WASM
Voice to Text	/voice-to-text/	Web Speech API

Architecture

audiotools.dev/
├── index.html              ← Main hub page
├── converter/
│   └── index.html          ← Audio converter (JS + optional WASM)
├── voice-to-text/
│   └── index.html          ← Speech-to-text transcription
├── wasm/
│   ├── main.go             ← Go WASM source (FLAC encoder)
│   ├── build-wasm.sh       ← Build script
│   ├── converter.wasm      ← Compiled WASM binary (build it!)
│   └── wasm_exec.js        ← Go WASM runtime (from Go installation)
├── sitemap.xml
├── robots.txt
├── CNAME
└── README.md

How it works

Audio Converter

The converter has two engines:

1. JavaScript engine (always available):

   • Decoding: Web Audio API (supports WAV, MP3, FLAC, OGG, AAC, M4A, WebM)
   • WAV encoding: Custom JS encoder (lossless)
   • MP3 encoding: lamejs (128–320 kbps)

2. WASM engine (optional, adds FLAC output):

   • Compiles go-audio-converter to WebAssembly
   • Enables FLAC encoding in the browser — a pure Go FLAC encoder running as WASM
   • The page auto-detects WASM availability and enables/disables FLAC accordingly

Voice to Text

Uses the browser's built-in Web Speech Recognition API. No audio leaves the device.

Building WASM (optional)

To enable FLAC encoding in the browser:

# 1. Clone go-audio-converter
git clone https://github.com/formeo/go-audio-converter.git
cd go-audio-converter

# 2. Copy WASM source
mkdir -p cmd/wasm
cp /path/to/audiotools.dev/wasm/main.go cmd/wasm/main.go

# 3. Build
GOOS=js GOARCH=wasm go build -o converter.wasm -ldflags="-s -w" ./cmd/wasm/

# 4. Copy Go's WASM runtime
cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .

# 5. Deploy to site
cp converter.wasm /path/to/audiotools.dev/wasm/
cp wasm_exec.js /path/to/audiotools.dev/wasm/

The converter page will auto-detect wasm/converter.wasm and show a "WASM engine active" badge with FLAC enabled.

Deployment

The site is static HTML — deploy to GitHub Pages:

git add .
git commit -m "Update audiotools.dev"
git push origin main

GitHub Pages serves from the main branch. The CNAME file points to audiotools.dev.

Open Source Projects

This site is the hub for the audio tools ecosystem:

Project	Language	Description
go-audio-converter	Go	Pure Go audio converter — no FFmpeg, custom FLAC encoder
voice-to-text	Python	Bulk voice transcription — Whisper, faster-whisper, OpenAI, Groq
music_recognition	Python	Bulk music identification via Shazam + auto ID3 tagging
audiobook-cleaner	Python	AI noise removal — MDX-Net, VR, Roformer models

Tech Stack

• Frontend: Vanilla HTML/CSS/JS (no frameworks, fast loading)
• Audio Processing: Web Audio API, lamejs, Go WASM
• Hosting: GitHub Pages
• SEO: JSON-LD structured data, Open Graph, semantic HTML

License

MIT — Roman Gordienko