MP3MPEG-1 Audio Layer III
The most universal audio format. Its compression shrinks files a lot while keeping good listening quality, and it plays on every device.
- Compression
- Lossy
Convert to
Audio converter
Convert your audio files to MP3 or WAV: recordings, iPhone Voice Memos, WhatsApp voice messages, music in FLAC or OGG. Pick the bitrate, from 128 to 320 kbps.
- Files never uploaded
- Free, no sign-up
- No queue
WAV5249464624E20400
MP34944330400000000
The first bytes of a file often reveal its real format.
or drop them here. You can also paste an image (Ctrl+V).
Free · No sign-up · No upload
Files
These sample files are generated on the page. Convert them to try it out, or add your own.
Most used conversions
Supported formats
WAVWaveform Audio File Format
Uncompressed audio at full quality, used for recording and editing. One minute at CD quality weighs about 10 MB.
- Compression
- Uncompressed
Convert to
OGGOgg (Vorbis or Opus)
A free audio format, common in video games and on the web, that usually holds Vorbis or Opus sound. Good quality at a small size, but it is less widely supported than MP3 on older devices. Formatomat writes the sound in it as Opus, or copies an original Vorbis or Opus track into it as it is.
- Compression
- Lossy
Convert to
M4AMPEG-4 Audio
MPEG-4 audio, usually encoded in AAC. It is the format of iPhone Voice Memos and of many songs bought on iTunes.
- Compression
- Lossy
Convert to
AACAdvanced Audio Coding
MP3’s successor, more efficient at the same bitrate. You find it in videos, online radio and M4A files.
- Compression
- Lossy
Convert to
FLACFree Lossless Audio Codec
A lossless audio format: it compresses without removing anything from the sound. Files are much smaller than WAV but far larger than MP3.
- Compression
- Lossless
Convert to
OPUSOpus
A modern, very efficient audio codec for both voice and music. WhatsApp and Telegram voice messages are recorded in Opus.
- Compression
- Lossy
Convert to
WEBAWebM Audio
WebM audio, often produced by browsers when recording from the microphone or during calls.
- Compression
- Lossy
Convert to
Frequently asked questions
Are audio conversions really free?
Yes: no sign-up, no watermark and no limit on the number of files. The work happens on your device, so it costs us nothing in servers.
Are my files sent anywhere?
No. They are read and converted right in your browser. You can even go offline once the page has loaded: conversions you have used since the site’s last update keep working.
Is there a size limit?
A file’s size has no fixed limit: it depends on your device’s memory and on the browser. A few hundred MB work well on a recent computer. On a phone, stick to lighter files, especially for video. Most conversions read the whole file: beyond a certain size, often about 2 GB (less on a phone), the browser cannot read it in one block, and a message gives the file’s size.
A few caps still protect the browser’s memory, including: 1 GB of unpacked data for an archive or a Word, Excel, OpenDocument or EPUB file (512 MB on a phone and on some devices with little memory), 20,000 files per archive, 5 million filled cells per workbook, and 500 pages for a TIFF converted to PDF. A file over a cap is not converted, and a message says so.
Which browsers work?
The page is designed for recent versions of Chrome, Edge, Firefox and Safari. Video conversion (MP4, WEBM, MOV, MKV) uses WebCodecs, a feature of Chrome and Edge and of recent versions of Safari and Firefox (except Firefox for Android, which does not have it yet). A conversion the browser cannot do is refused with a message that says so.