Audio
Audio tools that never upload your recordings
Turn a voice memo into MP3, cut the silence off a take, even out a recording that jumps between loud and quiet, or drop a stereo file to mono. Interviews, demos and voice notes stay on your machine.
8 ready now
Audio tools
Convert, trim, level and pull apart sound. Every one runs on your own device.
- Normalize Loudness Bring a recording to the loudness Spotify, YouTube or podcasts expect.
- Audio Converter MP3, WAV, M4A, FLAC, OGG, Opus and older formats, any direction.
- Join Audio Stitch several recordings or songs into one file.
- Trim Audio Cut a song, voice note or ringtone to exactly the part you want.
- Split Audio Soon Cut a long recording into parts, by length or at the silences.
- Stereo to Mono Fold two channels into one, or keep just the left or right.
- Change Volume Make a quiet recording louder or a loud one quieter.
- Fade In and Out Soon Smooth the start and end so a clip doesn’t begin or stop abruptly.
- Remove Silence Cut the dead air out of a recording and keep the natural pauses.
- Vocal Remover Cancel a centred vocal to leave a karaoke backing track.
- Split Into Stems Soon Pull a track apart into vocals, drums, bass and everything else.
3 more are being built. They are listed here without a link until they actually work.
What these tools are for
Audio files carry things people rarely think about before uploading them: interviews under embargo, therapy notes, demos that are not released, a recording of a meeting someone else is in. The convenient converters all work by taking a copy of that first.
Sound is small enough that a browser handles it comfortably. These tools decode with the browser’s own audio support where they can, and use FFmpeg in WebAssembly for the formats it cannot reach — the same engine desktop audio software is built on, running inside the tab instead of on a server.
Where a job does not need re-encoding, it does not do one: trimming an MP3 cuts it on a frame boundary and leaves the audio bit for bit identical, so a trim is lossless rather than a generation of quality lost.
The conversions people ask for most
Each one opens the converter already set to that format, with a note on what the change keeps and what it costs.
See all 93 audio conversionsAudio formats we read and write
What each format is for, where it opens, and the mistake people usually make with it.
Which format should you use?
- MP3 vs WAV WAV is uncompressed, perfect audio about ten times the size of an MP3.
- M4A vs MP3 M4A (AAC audio) sounds a little better than MP3 at the same bitrate and is the default for iPhones and iTunes.
- FLAC vs MP3 FLAC is lossless: it keeps CD quality in roughly half the space of WAV.
- FLAC vs WAV FLAC and WAV sound identical, bit for bit.
- OGG vs MP3 Ogg Vorbis is an open format that sounds a little better than MP3 at the same bitrate and is common in games and on Android.
Questions
Which audio format should I convert to?
MP3 if it has to play on anything, M4A for slightly better quality at the same bitrate on Apple devices, WAV or FLAC if you are still editing or archiving. MP3 vs WAV and FLAC vs MP3 go through the trade.
Does trimming audio re-encode it?
Not when it does not have to. Trimming an MP3 or M4A cuts on a frame boundary and copies the audio across untouched, so the result is identical to the original within the part you kept.
Is my recording uploaded?
No. The file is read in the page and processed by your browser, with nothing sent anywhere. How to check for yourself shows how to watch the network panel stay empty.
What does normalizing audio actually do?
It measures the perceived loudness of the whole file in LUFS and applies one gain change so it lands on a standard level — the same target podcast and streaming platforms use. It is not compression and does not squash the dynamics.