Convert audio

How it works

1. Drop the audio files. A video works too — only its sound is read.
2. Choose the format. MP3 plays on anything; M4A is the same quality in a smaller file and is what Apple devices prefer; WAV is uncompressed, for editing rather than for sending.
3. Set the bit rate, and choose mono for a recording of someone talking: it halves the file with no useful loss.
4. Press Convert audio and download. Each file keeps its own name with the new extension.

Frequently asked questions

Is my audio uploaded?

No. Your browser decodes the file and the new one is written in this page. A recording of a meeting, an interview or a voice memo never leaves the device it is on.

Which files can it read?

Whatever your browser can play, which in practice means MP3, M4A, AAC, WAV, OGG, Opus, FLAC and WebM, plus the sound track of MP4, MOV and MKV videos. A file the browser cannot play is refused with a message rather than silently producing nothing.

Does converting lose quality?

Converting a compressed file to another compressed format is a second generation, and no setting undoes that: going from a 128 kbps M4A to a 320 kbps MP3 makes a bigger file, not a better one. Converting to WAV loses nothing further but cannot recover what was already gone. Where you have the choice, convert from the original recording rather than from something already converted.

Which format should I choose?

MP3 when something old has to play it — a car stereo, a voice recorder, an ancient phone. M4A when size matters and the listener is on a modern device: at the same bit rate it sounds better than MP3. WAV when the file is going into editing software, or into a system that insists on uncompressed audio.

Why does WAV ignore the bit rate?

Because WAV is not compressed: it stores every sample, so its size comes from the length, the sample rate and the number of channels. About 10 MB a minute in stereo, half that in mono.

Can it trim, join or change the volume?

Yes, but each on its own page: Trim audio for the length, Merge audio to join files, Change audio volume for the level. This page converts, and does that one thing properly — the three are linked below.

What are the free limits?

Three files a run at 150 MB each and 10 runs a day, on the free plan. Nothing is added to the audio on any plan.