Ringdroid - Ringtone editor

Ringdroid is an open-source ringtone editor Chrome extension that runs offline and keeps all files local on your device. It enables you to create custom ringtones, alarms, and notification sounds from your own audio files.

Ringdroid features a user-friendly waveform editor for cutting and trimming, zoom for precise selection, the ability to record audio and turn it into a ringtone, preview before saving, and the option to assign ringtones to specific contacts. It supports common formats such as MP3, WAV, AAC, OGG, and AMR. The source code is publicly available on GitHub.