Free browser-based audio tools for producers, DJs and musicians — no sign-up, no watermarks, no daily limits.
Live site: audioforges.com
Built and run by one person. The frontend is Next.js; the analysis and conversion backend is FastAPI + ffmpeg with a few ML models behind it.
Analysis
- Key & BPM finder — Essentia key/tempo detection cross-checked with librosa, with a confidence score. Reads the audio itself rather than looking a track up in a database, so it works on unreleased music and demos.
- Audio to MIDI — note detection with a piano-roll preview before you download.
- Audio to sheet music — engraved score you can play back in the browser, exported as PDF, MusicXML and MIDI.
- Instrument tuner, metronome
Separation and cleanup
- Stem splitter — vocals, drums, bass, other
- Vocal remover
- Voice cleanup
Conversion
- Format converter, sample rate converter, mono/stereo converter
- YouTube to WAV, YouTube to MP3, video to audio
- Trim, pitch shift, loudness normalizer, ringtone maker
Transcription
Two tools can be embedded on any site with one line of HTML — free, no account, no API key. The only condition is keeping the attribution link visible.
<iframe src="https://www.audioforges.com/embed/key-finder"
width="100%" height="330" style="border:none;max-width:520px"
title="Free key and BPM finder by AudioForges"
loading="lazy"></iframe>Audio-to-MIDI is available at /embed/audio-to-midi. Live previews and the copy-paste snippets: audioforges.com/embed
- Next.js (App Router), TypeScript, Tailwind
- FastAPI backend, ffmpeg, Essentia, librosa, basic-pitch, Demucs
- Deployed on Vercel; analysis workers on a VPS
Long-form documentation on the audio problems behind the tools — sample rate and bit depth, audio formats for game engines, preparing samples for hardware samplers, converting audio for phone systems and more at audioforges.com/guides.
npm install
npm run devOpen http://localhost:3000.
Bug reports and feature requests: open an issue, or contact@audioforges.com