AudioTrim is a free online audio editor that runs entirely in your web browser. Cut and trim MP3s, merge files, record from your microphone, add fades, change volume and speed, and download the result — without installing software or creating an account.
Most online audio tools make you upload your files to a server, wait for processing, and trust a stranger's computer with your audio. That felt backwards. Modern browsers are powerful enough to do all of this locally, so AudioTrim does: your files never leave your device, edits apply instantly, and there are no upload limits because there are no uploads.
AudioTrim is supported by advertising. The ads keep the lights on; the editor itself has no premium tier, no watermarks, and no locked features.
AudioTrim is built on the Web Audio API, the audio engine that ships in every modern browser. Decoding, waveform rendering, editing, and MP3/WAV encoding all happen on your machine. If you're curious or want to verify the privacy claim, open your browser's network tab while editing — you'll see no audio data leaving your device.