Is my audio uploaded?

No. Files are processed on your device, inside your browser. Nothing is sent to a server.

Which browsers does it work in?

Current Chrome, Edge, Firefox and Safari. Files are decoded and encoded with the codecs built into your browser, so what it can read depends on the browser; M4A (AAC) output needs Chrome, Edge or Safari. MP3, WAV, FLAC and Opus work everywhere. The MP3 and FLAC encoders are downloaded from this site the first time they are needed.

How large a file can I use?

Up to 300 MB per audio file. Processing happens in browser memory, so very long recordings can be slow on phones and older computers.

Which format should I choose?

MP3 plays everywhere. M4A and Opus sound better at the same size. WAV and FLAC are lossless: WAV is uncompressed and large, FLAC is about half the size.

Audio Converter - Free Online Tool

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Convert between MP3, WAV, M4A, OGG, Opus and FLAC.