A free audio converter that turns any audio or video file into MP3, WAV or M4A in your browser, at Apple's recommended bit rates, with nothing uploaded.
Drop any audio or video file and convert it to MP3, WAV or M4A, at Apple's recommended bit rates. It all happens in this browser.
Your files
Settings
An hour at this setting is about 43.2 MB.
Convert
Add a file to convert.
Everything happens in this browser, so your files never leave your computer. MP3 is made with the LAME encoder, and loudness is measured to ITU-R BS.1770, the standard behind Apple's LKFS target.
This free audio converter turns any audio or video file into MP3, WAV or M4A, in your browser.
It uses Apple's own recommended bit rates, can bring your audio to Apple's -16 LUFS loudness, and writes your title and cover art into the file. Nothing is uploaded.
Here's which format to pick, what Apple asks for, and how big each one gets.
What is an audio converter?
An audio converter turns a sound file from one format into another, like WAV into MP3, or a video into just its sound.
This one reads WAV, MP3, M4A, AAC, MP4, MOV, WebM, OGG and FLAC, and writes MP3, WAV or M4A.
MP3, WAV or M4A?
Each format is right for a different job:
| Format | What it is | Use it for |
|---|---|---|
| MP3 | Compressed, plays everywhere | Podcast episodes, sharing, the web |
| WAV | Every sample kept, no compression | Editing, mastering, archives |
| M4A | AAC audio, smaller than MP3 at the same quality | Apple devices, RSS feeds |
WAV is the one to edit, and MP3 is the one to publish. Converting an MP3 to WAV doesn't bring back what MP3 compression took out.
What Apple asks for
Apple publishes the bit rates it recommends for podcasts:
| Format | Channels | Apple recommends |
|---|---|---|
| MP3 | Mono | 96 to 128 kbps, 44.1 or 48 kHz |
| MP3 | Stereo | 128 to 256 kbps, 44.1 or 48 kHz |
| AAC or MP3 in an RSS feed | Mono | 64 to 128 kbps |
| AAC or MP3 in an RSS feed | Stereo | 128 to 256 kbps |
That's from Apple's audio requirements, which also set the loudness: around -16 LKFS, give or take 1 dB, with no true peak over -1 dBFS.
The converter marks Apple's range in its quality list. For a spoken show, mono at 96 kbps is inside it, and half the size of stereo at 192.
How big each setting gets
The size of an hour of audio at each setting:
| Setting | An hour of audio |
|---|---|
| MP3, 96 kbps | 43 MB |
| MP3, 128 kbps | 58 MB |
| MP3, 192 kbps | 86 MB |
| MP3, 256 kbps | 115 MB |
| MP3, 320 kbps | 144 MB |
| WAV, 16-bit, 44.1 kHz stereo | 635 MB |
| WAV, 24-bit, 48 kHz stereo | 1.04 GB |
MP3 and M4A sizes are the bit rate times the length, whatever is being said. WAV depends on its sample rate, its bit depth and its channels.
Even out the loudness
Tick "Even out the loudness" and the converter measures your audio first, then brings it to the level podcasts use: -16 LUFS for stereo, as Apple asks.
It measures to ITU-R BS.1770, the standard behind Apple's LKFS. On the example, it reads -23.4 LUFS, the same as FFmpeg's own loudness meter.
A mono file goes to -19 LUFS instead. Players put mono on both speakers, where it sounds 3 dB louder than it measures.
So -19 in mono sounds like -16 in stereo. That's the rule Auphonic and Google's loudness guidelines use.
A limiter keeps every peak under -1 dB, Apple's true peak ceiling. It looks 5 milliseconds ahead, so it lowers a peak smoothly instead of clipping it.
Tags and cover art
MP3 and M4A files can carry a title, an artist or show, an album, a year and cover art. Players show them, and so do phones.
Add them under "Add tags and cover art". Apple asks for square art from 1400 to 3000 pixels, and the converter tells you when yours fits.
Nothing is uploaded
Most online converters send your file to their server and send back the result. This one converts in your browser, so your file never leaves your computer.
That's why there's no size limit but your computer's memory, and why a long recording works too.
Get your episode ready
Once your file is converted, check your show's feed with the podcast RSS feed validator. Then see how your show ranks with the podcast rank checker.
Who is the audio converter for?
It's for anyone whose audio is in the wrong format for where it's going:
- WAV to MP3 converter – people shrinking big studio files
- MP3 to WAV converter – editors whose app wants WAV
- M4A to MP3 converter – iPhone and Mac users with voice memos
- MP4 to MP3 converter – anyone taking the sound from a video
Every other tool is on my free tools page.
Edit and publish your audio
Record and edit it with
Audio Converter FAQs
Questions about the audio converter? Here's what to know.
An audio converter turns a sound file from one format into another, like WAV into MP3.
This one reads most audio and video files and writes MP3, WAV or M4A.
MP3 is the safest for podcasts, since every app and host takes it.
Apple Podcasts also takes AAC in an RSS feed.
Apple recommends 96 to 128 kbps for mono and 128 to 256 kbps for stereo, at 44.1 or 48 kHz.
For a spoken show, mono at 96 kbps is inside that range.
Apple asks for around -16 LKFS, give or take 1 dB, with no true peak over -1 dBFS.
A mono file is aimed at -19 LUFS, which sounds the same on two speakers.
Yes, this audio converter is free, with no account and no limit on files.
It runs in your browser, so it costs nothing to run.
No, the audio converter converts your files in your browser.
They never leave your computer.
This audio converter is for podcasters and anyone who works with audio:
- Podcast RSS feed validator – podcasters getting episodes ready for Apple Podcasts and Spotify.
- Podcast sponsorship calculator – shows that sell ads and need clean files.
- Top podcasts – anyone studying how the biggest shows sound.
Editors, teachers and musicians use it for quick conversions without installing anything.
I did.
I'm Navid Moazzez, and the audio converter is one of my free tools on navid.me.
Read more about me.
There's an audio converter, a WAV to MP3 converter, an M4A to MP3 converter, an MP4 to MP3 converter and an MP3 to WAV converter.
The rest are in free tools.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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