freesabaiConvert audio to MP3
Turn M4A, WAV, OGG, Opus, FLAC, AIFF or WebM into MP3, several files at once. Choose the bitrate, channels and sample rate, listen to the result, then save each file or all of them as one ZIP. It runs in your browser; your files are not sent anywhere.
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Result
How to use
- Choose or drop audio files, as many as you like: M4A from the iPhone voice recorder, WAV from a recorder, OGG or Opus from a chat app.
- Pick a bitrate (192 kbps is plenty for music, 96 to 128 kbps for speech). Channels and sample rate can stay at "As the original".
- Press "Convert to MP3" and watch the progress bar (you can cancel). Listen, then "Save" each file or "Save all as ZIP".
Good to know
- Which files open depends on the browser, because the browser decodes them. Chrome, Edge and Firefox on a computer open nearly everything; Safari and iPhones cannot open some OGG, Opus or WebM files. The page tells you when a file cannot be opened.
- MP3 throws some detail away. Converting an MP3 or M4A (AAC), already compressed, loses quality a second time, and a higher bitrate does not bring it back. If you have the WAV or FLAC original, convert that.
- Song title, artist and cover art (ID3 tags) are not carried over to the MP3. Files with DRM, such as songs downloaded in streaming apps, cannot be converted. Use this tool only with files you have the right to use.
- The browser decodes the whole file into memory first (an hour of stereo takes about 1.4 GB). Past about an hour, or about 20 minutes on a phone, the page warns you first; split much longer files.
- The MP3 encoder is lamejs (LAME in JavaScript, licensed LGPL-3.0); see the credits. For WAV files use Audio to WAV; for the sound of a video use Extract audio from video; to record what your computer is playing, try Sound Catcher.
Your files stay on your device
Everything runs in your browser (the encoding runs in a second thread of the browser, still on your device). Your audio and the MP3s are not uploaded to freesabai or anyone else, and nothing is kept in the browser: close the page and it is gone. The site counts only that this page was opened and how often a result was saved (no file names or contents, and you can turn counting off at the bottom of the site; see the privacy policy).
Report a problem or suggest an idea
A file that will not convert, or an option you would like? Tell us on the feedback page, no sign-up (please do not attach files with personal data).
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Questions and answers
Can I convert M4A to MP3 online for free?
Yes. Drop the M4A file, press Convert to MP3 and save. Most voice recordings from iPhone and Android are M4A, and every major browser can convert them. Nothing is uploaded.
Which bitrate should I choose?
192 kbps (the default) suits music; 96 to 128 kbps is enough for speech and meetings and makes smaller files. If the original is already MP3 or M4A, a higher bitrate will not make it sound better.
Why can some files not be converted?
The browser decodes the sound. Safari and iPhones cannot open some OGG, Opus or WebM files; try Chrome or Firefox on a computer. Files with DRM, like songs from streaming apps, cannot be converted anywhere.
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