Audio tools

Pull audio out of recordings and videos, change the format, tighten up silences, even out the volume and speed it up without changing the pitch. Everything you need to prepare meeting recordings, podcasts and lectures.

Tools

Convert audio formatConvert between MP3, WAV, M4A, AAC, OGG, OPUS, FLAC and AIFFTrim audioCut out just the part you needRemove silenceDetect and cut the quiet parts of a recordingNormalize volumeMatch loudness across files or lift quiet recordingsChange audio speed0.5× to 3×, keeping the pitch

Popular conversions

MP4 to MP3Extract the audio of a video as MP3WAV to MP3Shrink large WAVs to a tenth of the sizeM4A to MP3Convert iPhone voice memos (M4A) to MP3MP3 to WAVConvert MP3 to uncompressed WAV for editing

About the audio tools

Decoding uses the browser's built-in WebCodecs, which reads MP3, AAC, Opus, FLAC and WAV as well as the audio track of video files such as MP4 and MOV; formats WebCodecs cannot read fall back to the Web Audio API. Encoding is also built into the browser, except for MP3, where we bundle LAME as WebAssembly for browsers without a native MP3 encoder.

Silence removal and normalization need to analyse the whole file, so they decode it to PCM first. Recordings of several hours still work, but this uses a lot of memory, so avoid running them with many other tabs open.