Audio to MP3 Converter
Turn iPhone voice memos, WAV, FLAC or the sound of an MP4 video into MP3. Your file never leaves your device.
- Never leaves your device
- No sign-up
Quick answer: To convert audio or MP4 to MP3, pick the file, choose a quality and click "Convert to MP3". The conversion runs in your browser: nothing is uploaded to a server, so private recordings stay private.
How to do it in 3 steps
- 1Pick one or more audio or video files.
- 2Choose the MP3 quality.
- 3Convert and download the MP3 (or a ZIP).
Why use Pronto Arquivo
Voice memos to MP3
Converts the M4A files from iPhone Voice Memos into MP3s that play anywhere.
MP4 to MP3
Extracts the audio from MP4, MOV and WebM videos, like lectures and meeting recordings.
Truly private
Most popular converters upload your file to a server. Here it stays on your device.
Batch conversion
Convert many files at once and download them all in a ZIP.
Guides
Exporting an iPhone voice memo
In Voice Memos, tap the recording, tap the three dots, then Share and "Save to Files". Pick the M4A file here. WhatsApp voice messages (.opus) work too: long-press, Forward or Share, and save the file.
Which quality to choose
128 kbps is the standard for voice and music. For long voice recordings, 96 kbps makes a smaller file; for music, go with 192 kbps.
Frequently asked questions
How do I convert M4A to MP3?
Pick the M4A file on this page, choose a quality and click Convert to MP3.
How do I convert MP4 to MP3?
Pick the video here: the audio is extracted and saved as MP3.
Can I convert WhatsApp audio to MP3?
Yes. Save the voice message (.opus or .ogg) and pick it here.
Is there a file size limit?
The site has no limit. Very long files depend on your device’s memory; on a computer, hours of audio work fine.
Is my audio uploaded anywhere?
No. The conversion happens in your browser.
