MP3 Audio Editor Online

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This editor opens an MP3 (WAV works too) as a full waveform you can edit by eye. Drag across the waveform to select a section, then trim it, move it, or delete it. Stitch two parts together, cut an intro, or reorder a chorus, all by clicking on the audio rather than typing timestamps.

For sound, you can apply effects directly on the track: reverb, bass boost, 8D spatial audio, a slowed + reverb mix, or a speed and tempo change. So if you came here to make a slowed and reverbed version to post, a bass-boosted edit, or an 8D mix, those are a few clicks each.

To start, open the editor and drop in your file. The waveform loads in a few seconds, and from there you select, edit, and stack effects. Nothing is final until you export, so you can back out of a trim or pull off an effect and try something else first.

When the track sounds right, export the edited MP3 and download it.

It runs right in your browser, with nothing to install and no account to make. That's the short answer to the usual question: no, you don't need software to edit an MP3 this way.