UtilityKit
500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.
Free Audio Tools — 11 Online Utilities
11 tools · Trim, Convert, Normalize
Free audio utilities for everyday post-processing: trim/cut MP3s, convert between MP3/WAV/OGG/M4A/FLAC, compress for upload, merge multiple clips, normalize loudness, and adjust tempo or pitch. Client-side tools keep files on your device.