About the Audio Converter
Convert audio files between MP3, M4A (AAC), WAV, FLAC and OGG. Turn a WAV recording into a small MP3, an iPhone M4A voice memo into an MP3 that plays everywhere, an MP3 into WAV for editing, or a FLAC album into a format your car stereo reads.
The conversion runs in your browser with FFmpeg, so your file is never uploaded. Almost any audio file works as input, including OGG, Opus, WMA, AIFF, AMR and the sound of videos, up to 100 MB.
How it works
The converter decodes the first sound track of your file and encodes it again in the format you choose. The sample rate and the number of channels stay as they were where the new format allows it (MP3 goes up to 48 kHz), and tags such as the title are not copied.
MP3, M4A and OGG are lossy: they make the file much smaller by leaving out detail you are unlikely to hear. The quality setting, in kilobits per second, decides how much data each second gets. 192 kbps is a good default for music; 128 kbps is plenty for speech.
WAV and FLAC are lossless: they keep exactly the sound that was decoded. WAV is uncompressed and large, about 10 MB a minute for CD-quality stereo, while FLAC stores the same sound in roughly half the space.
Assumptions and limits
- Converting a lossy file to a lossless one makes it bigger, not better: lost detail can't be brought back.
- WAV output is 16-bit, the format of CDs, which every editor and player reads.
- Opus files can be read but not written in this version; choose OGG or M4A for a small file instead.
Worked examples
WAV to MP3
A 3-minute stereo WAV of about 30 MB becomes an MP3 of about 4 MB at 192 kbps.
M4A voice memo to MP3
iPhone voice memos are M4A. Convert them to MP3 at 128 kbps to share them with apps or people that can't open M4A.
MP3 to WAV for editing
Some editors and samplers only take WAV. The WAV holds the decoded MP3 sound exactly and is about ten times larger.
How to use the Audio Converter
- Pick the file to convert. MP3, WAV, M4A, OGG, FLAC, WMA and more.
- Choose the new format. And the quality for MP3, M4A or OGG.
- Convert and save. Listen on the page, then download the file.
Frequently asked questions
How do I convert WAV to MP3 for free?
Choose the WAV file on this page, pick MP3 and a quality such as 192 kbps, and press Convert to MP3. The file is converted in your browser with no sign-up, no watermark and no upload, and you can download it straight away.
Which audio format should I choose?
MP3 plays on nearly everything. M4A is slightly smaller at the same quality and is the Apple format. WAV is best for editing, FLAC for keeping music in full quality at a smaller size, and OGG for games and Android.
Does converting MP3 to WAV improve the quality?
No. WAV stores the sound without compression, but the MP3 has already lost some detail, and converting cannot bring it back. The WAV sounds the same as the MP3; it is just easier for editing software to work with.
Can I convert M4A files from my iPhone?
Yes. Voice memos and songs from iTunes are usually M4A files. Choose one here and convert it to MP3, WAV or another format; on an iPhone you can pick it from the Files app.
Why can't I convert to Opus?
The Opus encoder in the in-browser version of FFmpeg used here isn't reliable yet, so Opus is offered as an input only. For a small file with good quality, choose OGG or M4A at 128 kbps instead.
This tool runs entirely in your browser. What you enter or upload stays on your device and is never sent to our servers.