Convert Audio
Convert audio files between MP3, WAV, OGG, FLAC and AAC.
First use downloads FFmpeg (~30 MB). It's cached after that.
About this tool
Audio Converter transforms audio files from one format to another directly in your browser, without sending any data to external servers. You can convert to MP3, WAV, OGG, FLAC, or AAC in just a few clicks.
To use it, select the audio file you want to convert — the input can be any format supported by the browser, including MP3, WAV, OGG, FLAC, AAC, and M4A. Then choose the desired output format and click Convert. Processing is done locally using ffmpeg.wasm, a WebAssembly build of FFmpeg. The first time you use the tool, the conversion engine loads automatically — this may take a few seconds depending on your connection speed. Once converted, the file is immediately available to download.
Common use cases include: converting iPhone voice memos from M4A to MP3 for broader player compatibility; preparing audio tracks for platforms that only accept specific formats; converting lossless WAV to FLAC to save disk space without quality loss; turning OGG files into MP3 for better compatibility with older devices.
Because all processing happens on your own device, your files never leave the browser. There is no upload, no server involved, and no account required. The tool is completely free and works on both desktop and mobile with any modern browser.
Frequently asked questions
Is this tool free to use?
Yes, completely free. No paid plans, subscriptions, or usage limits.
Are my audio files uploaded to a server?
No. All processing happens in your browser using ffmpeg.wasm. Your files never leave your device.
What output formats are supported?
MP3, WAV, OGG, FLAC, and AAC. For input, the tool accepts any format FFmpeg recognizes, including M4A, OPUS, and WMA.
Is there a file size limit?
The tool does not impose a size limit, but very large files (above 500 MB) may be slow depending on the available memory in your device.
Does it work on mobile?
Yes. The tool works in any modern browser, including Chrome and Safari on iOS and Android.