# AudioTools.dev

> Free, open-source audio processing tools that run entirely in your browser. No uploads, no servers, no sign-up. All processing uses Web Audio API and WebAssembly.

## Online Tools

- [Audio Converter](https://audiotools.dev/converter/): Convert between WAV, MP3, FLAC, OGG, AAC, M4A, WebM. Uses LAME and FLAC WebAssembly encoders. No file upload.
- [Voice to Text](https://audiotools.dev/voice-to-text/): Real-time speech transcription in 60+ languages using Web Speech Recognition API.
- [Text to Speech](https://audiotools.dev/text-to-speech/): Convert text to natural speech in 50+ languages. Adjustable speed (0.25x-3x), pitch, volume.
- [Audio Trimmer](https://audiotools.dev/audio-trimmer/): Cut audio files with visual waveform editor. Drag handles, preview, download WAV.
- [Audio Joiner](https://audiotools.dev/audio-joiner/): Merge multiple audio files into one with crossfade transitions. Drag to reorder.
- [Volume Booster](https://audiotools.dev/volume-booster/): Increase audio volume up to 500% or normalize to consistent peak level. Soft-clipping.
- [Audio Speed Changer](https://audiotools.dev/audio-speed-changer/): Slow down or speed up audio. 0.25x to 4x with pitch preservation.
- [Audio Compressor](https://audiotools.dev/audio-compressor/): Reduce audio file size by adjusting bitrate and sample rate.

## Open Source Projects (GitHub)

- [go-audio-converter](https://github.com/formeo/go-audio-converter): Pure Go audio converter — no FFmpeg, no CGO. Custom FLAC encoder. Single binary.
- [voice-to-text](https://github.com/formeo/voice-to-text): Bulk voice message transcription. Whisper, faster-whisper, OpenAI API, Groq. Telegram bot included.
- [music_recognition](https://github.com/formeo/music_recognition): Bulk music identification via Shazam API. Auto ID3 tagging, file renaming.
- [audiobook-cleaner](https://github.com/formeo/Audiobook-Cleaner): AI audiobook noise removal using MDX-Net, VR, and Roformer models.

## Key Facts

- Privacy: all browser tools process audio locally. No files uploaded. Zero data collection.
- License: MIT.
- Formats: WAV, MP3, FLAC, OGG, AAC, M4A, WebM.
- Works offline: Converter, Trimmer, Joiner, Volume Booster, Speed Changer, Compressor work without internet.
- Mobile: all tools work on Chrome Android and Safari iOS.
- Author: Roman Gordienko (https://github.com/formeo)
- Sister site: DevToolKit.site — 21 free developer tools (JSON formatter, JWT decoder, PostgreSQL config generator)