Quick answer
To convert audio to MP3 online for free, open the MP3 Converter, choose your file (WAV, M4A, AAC, FLAC, or OGG), select your preferred bitrate (128 kbps, 192 kbps, or 320 kbps), and click “Cut & export MP3”. The conversion runs in your browser and completes in seconds.
How to use the MP3 Converter
- Select source fileChoose any audio file on your iPhone, Android, Mac, or Windows PC.
- Pick MP3 bitrateSelect 192 kbps for balanced sound or 320 kbps for audiophile quality.
- Optional trims or fadesOptionally trim silence or add a fade in / fade out at the same time.
- Download universal MP3Click export and get your clean MP3 file ready for any player or car stereo.
Why convert to MP3?
While modern smartphones record in M4A (AAC) or lossless formats like FLAC and WAV, many car stereos, older MP3 players, video editing software, and websites only accept MP3. Converting to MP3 ensures your audio plays everywhere without compatibility errors.
Supported input formats
Our in-browser decoder handles WAV, M4A, AAC, OGG Vorbis, OPUS, FLAC, AIFF, WebM and the audio track of common MP4 video recordings.
Everything you can do
Cut & trim
Sample-accurate cuts with draggable handles and millisecond time inputs.
Remove a section
Delete the middle of a recording and join the rest seamlessly.
Fade in / out
Smooth 0–10 s fades so clips never start or end with a click.
Volume & speed
Boost quiet audio up to 300% and change tempo from 0.5× to 2×.
Private by design
Runs entirely in your browser. Files are never uploaded or stored.
Instant export
MP3 encoding in a background thread — the page never freezes.
Frequently asked questions
Is there a limit on how many files I can convert?
No. Because conversion happens on your device and uses zero server resources, you can convert as many files as you want without rate limits or waiting lines.
Which bitrate should I choose?
192 kbps is the best all-around choice. For voice memos, 128 kbps is sufficient; for music with high acoustic detail, pick 320 kbps.
Is MP3 Cutter really free?
Yes. Every feature — cutting, fading, volume, speed and MP3/WAV export — is free with no sign-up, no watermark and no daily limit. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Your audio is decoded and processed entirely inside your browser using the Web Audio API and an MP3 encoder that runs locally. The file never leaves your device, so it works even for private recordings.
Does it work on iPhone, Android and Chromebook?
Yes. MP3 Cutter runs in any modern browser — Safari on iPhone/iPad, Chrome on Android, Chrome OS, Windows, macOS and Linux. No app install is required.
Last updated · by MP3 Cutter Team