Audio
Audio Converter
Convert between MP3, WAV, M4A, AAC, OGG, and FLAC — entirely in your browser. Drop one file or a whole batch and convert them all at once.
This audio converter runs FFmpeg directly in your browser using WebAssembly — the same FFmpeg used in professional video and audio workflows, compiled to run locally on your device. There is no server, no account, and no upload. Your audio file is read from your disk, transcoded in a background thread, and the result is available immediately for download. Nothing is sent over the network.
The converter supports the most common audio formats: MP3 for universal compatibility, WAV for uncompressed archiving, M4A and AAC for Apple ecosystem and streaming, OGG for open-source workflows, and FLAC for lossless compression that is smaller than WAV. When converting to a lossy format (MP3, AAC, OGG), the encoder uses high-quality settings by default — MP3 at VBR quality level 2, AAC at 192 kbps, and OGG Vorbis at quality 5. Need to convert a whole folder at once? Drop in as many files as you need — every file converts with the same settings, and you can download each one individually or grab the entire batch as a single ZIP.
How to Use
- 1
Drop one or more audio files onto the uploader or click to browse. Supported input formats: MP3, WAV, M4A, AAC, OGG, FLAC, OPUS.
- 2
Choose your output format by clicking one of the format buttons (MP3, WAV, M4A, AAC, OGG, FLAC).
- 3
Click "Convert". On first use, the FFmpeg engine (~24 MB) is downloaded and cached by your browser. Subsequent conversions start in seconds.
- 4
When conversion finishes, preview and download the result — or, for a batch, download each file individually or grab all of them as a ZIP.
Frequently Asked Questions
Are my audio files uploaded to a server?
No. Conversion runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio never leaves your device.
Why does the first conversion take longer?
The first run downloads the FFmpeg WebAssembly binary (~24 MB). Your browser caches it automatically, so all subsequent conversions begin immediately.
Will there be quality loss?
Converting to WAV or FLAC (lossless) from any source preserves all audio data exactly. Converting between lossy formats — like MP3 to OGG — re-encodes the audio and introduces a small additional quality loss. This is a property of lossy codecs in general, not specific to this tool. If preserving quality matters, convert to FLAC or WAV first.
What is the difference between M4A and AAC?
AAC is the audio codec; M4A is the container (MPEG-4 Audio). Both store the same AAC audio data — M4A is typically used by Apple devices and iTunes. This tool outputs both as AAC audio in an MP4 container.
Does this work on iPhone or Android?
Yes. Modern iOS Safari and Android Chrome both support WebAssembly and can run this converter. The initial 24 MB download may take a moment on a mobile connection, but conversion itself is fast once the engine is cached.
Can I convert multiple audio files at once?
Yes — this is a bulk audio converter. Drop several files in one batch; each converts independently with the same output settings, and you can download them individually or all together as a ZIP.