Short answer: Open the tool in iPhone Safari or Android Chrome, select audio from Files, drag a range on the waveform, and download the result after previewing it. Processing happens in the mobile browser, so no editing app is required.
Phone editing steps
- Save the song, recording, or video in your phone's file manager.
- Open MP3 Cutter, tap the file area, and choose the source.
- Rotate to landscape for a wider waveform and use zoom to locate the cut precisely.
- Preview the range. Add several ranges when you need multiple sections.
- Choose MP3, WAV, or M4R and download the result.
iPhone versus Android
Android generally accepts MP3 files directly as ringtones. iPhone uses M4R. The tool can generate an M4R file, but adding a custom ringtone to iOS still follows Apple's supported Files or GarageBand workflow.
Large-file precautions
- Phones have less available RAM than desktops, so long videos and lossless audio are more likely to fail.
- Avoid switching among many apps while processing; the operating system may reclaim the browser tab.
- The first video extraction or M4R export needs a connection to load the local processing component.
- Find the result in Files or your browser's downloads list.
For files several hundred megabytes in size or lengthy editing sessions, a desktop is more reliable. This is a device-memory limit, not an upload-size limit.
Cut audio on your phone