Audio tools
10 tools, all running in your browser
Cutting, converting, and making sound louder, done by your own browser. A voice memo, a recorded meeting, or a song you are still working on stays on your device.
- Audio cutterKeep one part of a song or recording, in the format it came in.
- Remove part of audioTake a cough, an ad, or a mistake out of a recording and keep the rest.
- MP4 to MP3Take the sound out of an MP4 video and save it as an MP3.
- WAV to MP3Turn a WAV recording or song into an MP3 a fraction of the size.
- M4A to MP3Turn an M4A voice memo, song, or audiobook into an MP3.
- MP3 to WAVTurn an MP3 into the standard WAV an editor or upload form asks for.
- FLAC to MP3Turn a lossless FLAC song into an MP3 that plays everywhere.
- Make audio louderTurn up the sound in a video, an MP3, an M4A, or a WAV.
- MOV to MP3Take the sound out of an iPhone or QuickTime MOV and save it as an MP3.
- WebM to MP3Take the sound out of a WebM video or recording and save it as an MP3.
Why a recording is worth keeping to yourself#
Most sound files people convert are recordings they made: a voice memo, a lecture, a call, a band practice. They carry the voices of people who never agreed to share them, and a recorded meeting holds everything that was said, not only what went into the minutes. Sending one to a converter hands all of that to a server you know nothing about.
Every page here reads the file inside your browser tab and hands the result straight back as a download. Nothing is sent anywhere, which you can check by watching the network panel stay empty while it works. Once the page has loaded, it keeps working with the network off.
Lossless and lossy, and which to choose#
WAV and FLAC are lossless: they keep every sample the recorder captured. WAV stores the samples as they are, about 10 MB a minute for CD-quality stereo, and every program can open it. FLAC packs the same samples into about half that, and gives back exactly the same sound when played.
MP3, AAC, which M4A files hold, and Opus are lossy. They leave out detail the ear is poor at noticing and come to about a tenth the size of a WAV. An MP3 at 192 kbps is very hard to tell from the original for most music, and MP3 plays on every phone, car, and speaker made in the last twenty years, which is why most of these pages make one.
Converting a lossy file to a lossless one, such as MP3 to WAV, keeps exactly what the MP3 had and makes the file far bigger. It does not bring back what the MP3 left out. It is worth doing when an editor, a sampler, or an upload form wants a WAV, and not to improve the sound.
What your browser can do with sound#
These pages read sound with the same decoders your browser plays it with, and write MP3 with LAME, the long-established MP3 encoder, which runs inside the tab. Current versions of Chrome, Edge, and Safari read MP3, AAC, WAV, and FLAC, and each page checks what your browser can read before it starts. An older Safari, such as Safari 17, has no way for a page to read sound piece by piece, so it reads the whole file at once, which works for up to 30 minutes of sound.
A few formats no browser reads, such as Apple Lossless (ALAC), which some lossless voice memos and ripped CDs use, and WMA from older Windows programs. Export those from the app that made them as WAV first.
Frequently asked questions#
Are my sound files uploaded?
#
No. Each page reads the file in your browser tab, works on it there, and hands the result back as a download. Nothing is sent to a server at any point.
Is there a limit on length or file size?
#
No fixed one. The finished file is held in your browser tab until you save it, so the limit is the memory the tab can use, which an hour of sound fits in easily. An older Safari is the exception: it reads the whole file at once and handles up to 30 minutes.
Does converting to MP3 lose quality?
#
A little, because MP3 leaves out detail to make the file small. At 192 kbps, the default on these pages, most people cannot hear the difference. Converting from a WAV or a FLAC gives the best MP3, because nothing has been lost before the MP3 is made.
Can I take the sound out of a video?
#
Yes. MP4 to MP3 takes the sound from an MP4 and saves it as an MP3, and there are pages for MOV, as an iPhone records, and for WebM. The picture is left out, and you can keep only part of the sound with the start and end.