Quick answer
To cut an M4A file online, open it in the M4A Cutter (iPhone voice memos work directly from the Files app), drag the handles around the section you want, and export as MP3 or WAV. The M4A is decoded by your browser, so nothing is uploaded and it also converts M4A to MP3 in the same step.
How to use the M4A Cutter
- Open the M4AOn iPhone, tap Choose audio file → Browse → pick the memo.
- Select your clipDrag the handles or use quick-select chips.
- Choose MP3 or WAVMP3 plays everywhere; WAV is lossless.
- DownloadSave to Files, Downloads or share directly.
M4A, AAC and MP3 explained
M4A is an MPEG-4 container that usually holds AAC audio — the default for iPhone voice memos and Apple Music downloads. It's efficient but less universally supported than MP3. Cutting here converts the result to MP3 or WAV, which play on every device, car stereo and editor.
Protected files
Purchased iTunes tracks without DRM work. Apple Music streaming downloads are DRM-protected and cannot be decoded by any browser.
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
Can I keep the output as M4A?
Currently the editor exports MP3 and WAV, the two most compatible formats. MP3 at 192 kbps is roughly the same size as the original M4A.
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