Audio Format Converter
Convert audio between MP3, WAV, FLAC, M4A, and OGG. Runs entirely in your browser — your file never leaves your device.
Everything runs locally in your browser. Your audio is never uploaded. The first conversion downloads the engine (~25 MB); after that it is cached.
About this tool
This converter changes an audio file from one format to another — for example turning a large WAV into a portable MP3, or extracting a lossless FLAC from an M4A. It also accepts video files and pulls the audio track out, so an MP4 or MOV recording can become an MP3 in one step.
Unlike most online converters, nothing is uploaded. The tool loads a WebAssembly build of ffmpeg into your browser and does the entire conversion on your own machine, which matters when the recording is a private call, an interview, or anything you would rather not hand to a third-party server.
How to use it
Three steps, no signup:
- Choose an audio or video file, or drag it onto the drop area.
- Pick the output format, and a quality level for the compressed formats.
- Select Convert, wait for the progress bar, then download the result.
The first run downloads the conversion engine (around 25 MB); after that it is cached and subsequent conversions start immediately.
Common questions
Does my audio get uploaded to a server?
No. The conversion runs entirely in your browser using a WebAssembly build of ffmpeg. Your file is read locally and never leaves your device, which is why the first run downloads the engine but later runs are quick.
Which format should I choose?
Use MP3 or M4A/AAC for small, widely compatible files. Use WAV or FLAC when you need lossless quality for editing or archiving. FLAC is compressed and lossless, while WAV is uncompressed and larger.
Is there a file size limit?
There is no hard server limit because processing is local, but very large files use more browser memory and take longer. Files up to a few hundred megabytes are fine on a typical laptop; multi-gigabyte files may be slow or run out of memory.
Need to pull audio out of video specifically, or trim a clip first? Try the video to audio extractor and the audio & video trimmer. For heavier media work, see our development and automation service.