Audio Converter
Convert any audio file to MP3, WAV or Opus — pick bitrate, channels and sample rate — privately in your browser.
How to Convert an Audio File in 3 Steps
Drop an audio file
Drag any MP3, M4A, FLAC, OGG, Opus or WAV onto the left pane. It is decoded on your device and a waveform with a player appears.
Choose the target
Open Settings and pick MP3 (with bitrate), WAV or Opus. Optionally force mono/stereo or a new sample rate — 16 kHz mono is ideal for voice notes and transcription.
Convert and download
Click Convert audio. The result plays on the right with its format, length and size, ready to download.
Audio Converter — Frequently Asked Questions
Is my audio uploaded anywhere?
No. The file is decoded by your browser's Web Audio engine, processed on your device and encoded to MP3 or WAV with an open-source encoder running in the page. Nothing is sent to a server.
Can I convert to M4A, AAC or FLAC?
Not yet — browsers ship no AAC or FLAC encoder, and adding one would mean a multi-megabyte download. MP3 and WAV cover nearly every use; Opus is available for the smallest voice files.
Why is Opus slower than MP3?
Opus uses the browser's built-in MediaRecorder, which only works in real time while the audio plays silently — so a 3-minute track takes 3 minutes. MP3 and WAV are encoded offline at about 15× real time.
Does it lose quality?
Decoding to raw samples is lossless; the only loss is the final MP3 encode, and 192–320 kbps is transparent for most listeners. Choose WAV if you plan to edit the result again — re-encoding MP3 twice stacks artefacts.
Is there a length or size limit?
Files up to 200 MB are accepted. Decoded audio lives in memory (about 10 MB per minute of stereo), so hour-long recordings work on a desktop but may be tight on a low-end phone.