For Professional Use
audio JS
Open Audio Stack
20-20k
JavaScript packages for audio: decode, encode, measure, process, synthesize and play, the same code in the browser, Node, Deno and Bun.
Utilities
- Extract audio from videoVideo → MP3, WAV, FLAC, M4A, ALAC, OGG, Opus, AAC
- Remove or replace video audioStrip the audio track, or swap in AAC, Opus, ALAC or FLAC — the video is never re-encoded
- Audio converterMP3, WAV, FLAC, M4A, ALAC, WavPack, OGG, Opus, AAC, AIFF, CAF, WebM, QOA; reads APE, TTA, Musepack, DSD, tracker modules too
- Loudness meter and normalizerLUFS, true peak, loudness range; normalize for Spotify, YouTube, podcasts
- Noise removerBackground noise, hum, clicks, wind, plosives, reverb
- Remove silence from audioPodcast smart speed, silence removal, trim start/end — voice activity detection
- Wow and flutter fixerCorrect slow pitch drift and fast wobble in tape, cassette and vinyl transfers
- Transcribe audio to text and subtitlesWhisper speech-to-text; TXT, SRT, VTT; sentence or word timestamps
- Key and BPM finderMusical key, Camelot code, tempo, chords
- Vocal removerKaraoke track or isolated vocal, by a trained model (SCNet, Mel-Band RoFormer) or mid/side
- Stem splitterVocals, drums, bass and other from any song, by the SCNet model; play, mute, solo, rebalance, save
- Pitch and tempo changerTranspose semitones, change speed without changing pitch
- MIDI to MP3Render a MIDI file with a synth-GM instrument set, no soundfont
- Audio to MIDI converterSongs, chords, piano, guitar or voice to MIDI, MusicXML and ABC, with Spotify’s Basic Pitch
- TunerChromatic tuner for guitar, bass, violin, voice
- Tone generatorSine, square, sawtooth and triangle tones, binaural beats, harmonics, noise, sweeps; save as WAV
- Speech prosody editorMove syllables to notes, straighten or smooth intonation, change phrase timing
- Audio recorderRecord from the microphone, save as MP3, WAV, FLAC, Opus
- Lossless audio checkerDetect a fake lossless FLAC or WAV: spectral cutoff, edge sharpness, spectral holes
- SpectrogramFrequency-over-time image of any recording
- Room and speaker measurementFrequency response, reverb time (RT60), latency, via a sine sweep
- Audio latency testRound-trip delay from speaker to microphone, and the Bluetooth delay you hear
Lab
- How do you set words under a waveform?Words under their sound, with help from typesetting and music engraving
- Drawing a waveformEvery Nth sample, lowest and highest, RMS, brightness by level, true peaks, decibels, colour, stereo
- Seeing soundFrames, windows, frequency axes, colour maps, reassignment, many resolutions, multitapers, Wigner–Ville
- Hearing a momentTape, loops, grains, noiscillators, random phase, phase vocoders: what a held caret plays, and what it costs
- Where the panels goSplits, docks, activity bars, inspectors, tabs, floating windows: seven layouts of one audio editor, and the one to keep
- Audio in JavaScriptnew Audio(), a Web Audio equalizer, files in and out, Node.js, and which library fits which job
- Recording audio in the browsergetUserMedia, the formats MediaRecorder gives your browser, every sample to a WAV, latency
- Hearing what isn't thereShepard tones, the Risset rhythm, Deutsch's scale illusion, binaural beats, the missing fundamental
Sponsors
Maintenance is funded by sponsorship — become a sponsor · Funding details