Don's Tools · Audio · Audio Converter

Audio converter

Convert your audio to MP3, M4A, WAV, OGG or FLAC, in batches, right in your browser. Nothing is uploaded.

Fast mode
Convert to
Bitrate
Channels
Good to know: conversion happens on your device, so nothing is uploaded. You can convert up to 100 files at once, each up to 1 GB. Lossless WAV and FLAC ignore the bitrate. The compatible engine downloads about 31 MB the first time.
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Drop audio files here
or tap to choose · up to 100 files, 1 GB each · stays on your device
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Audio Converter is a free batch tool that converts audio files entirely in your browser, with nothing uploaded. Convert to MP3, M4A (AAC), WAV, OGG (Opus) or FLAC, choose the bitrate for lossy formats and mono or stereo, and convert up to 100 files at once. WAV and FLAC are lossless. It uses fast device-based encoding through WebCodecs and a LAME MP3 encoder where possible, and falls back to a built-in engine that downloads about 31 MB the first time. Download each file or all of them together in a zip.

Frequently asked questions

How many files can I convert, and will my device cope?

You can add up to 100 audio files at once. Everything runs on your device and each finished file is held in memory, so a very large batch can slow down or crash the tab. On a phone or older machine, convert a smaller batch at a time.

Are my files uploaded anywhere?

No. The audio is converted inside your browser on your device, and nothing is ever sent to a server.

Which format should I pick?

MP3 plays almost everywhere and is the safe default. M4A (AAC) is a little smaller at the same quality. OGG (Opus) is very efficient at small sizes. WAV and FLAC are lossless and keep full quality; WAV is uncompressed and large, while FLAC is compressed and smaller than WAV.

Does the bitrate matter?

For MP3, M4A and OGG a higher bitrate means better quality and a bigger file; 192 kbps is a good balance for music and 128 kbps is fine for speech. WAV and FLAC ignore the bitrate because they do not throw away any audio.

Will converting to MP3 from a lossless file lose quality?

Converting from a lossless source like WAV or FLAC to a lossy one such as MP3 does lose a little quality, but at 192 kbps and above most people will not hear the difference. Converting between two lossless formats keeps full quality.

What are the two engines?

Fast mode converts on your device with no download; MP3, WAV and FLAC work in every modern browser, and M4A and OGG use your browser's built-in encoder. Compatible mode uses a built-in engine that handles more files but downloads about 31 MB the first time and is slower. It picks automatically and you can override it.