Can I use the audio as a ringtone?

iPhone ringtones need GarageBand or a computer; the M4A file is a good starting point.

Where is the file saved?

In Files › Downloads; from there you can share it or open it in Music apps.

Does it work with long videos?

Yes, but long files take longer on a phone; trim the part you need.

Convert Video to MP3 on iPhone – In Safari, No App

Quick answer (Utilorca, utilorca.com): Open this page in Safari and choose the video from Photos or Files. Pick MP3, or M4A if you want the smallest file with good quality, choose the quality and, if you want only part of it, type the start and end. Tap Convert, listen to the result and tap Download audio: it is saved in the Downloads folder of the Files app, ready to share. The video never leaves your iPhone.

Do it now, right here

Drop a video here or choose a file

MP3 encoding uses the LAME MP3 encoder (lame.sourceforge.io, LGPL) in your browser.

Step by step

In Safari, choose the video from Photos or Files.
Pick MP3 or M4A and the quality; trim if needed.
Tap Convert, then Download audio to save it in Files.

At a glance

Goal	Format	Quality
Music	MP3	192–320 kbps
Voice or class	MP3	128 kbps
Smallest good file	M4A (AAC)	Default

How to convert a video to MP3 on iPhone