Cut a section out of an audio file without re-encoding, or merge multiple tracks — even mixed formats — into one MP3, WAV, or M4A. FFmpeg WebAssembly does the work on your device.
How to use Audio Cutter & Joiner (MP3 Splitter)
Pick Split / Cut to trim one file, or Join to merge several.
For cutting, set the start and end time (the Playhead buttons grab the player position); for joining, add files and arrange their order.
Click the action button, preview the result, and download it.
Frequently asked questions
Does cutting reduce the audio quality?
No — the cut uses stream copy, so the audio data is not re-encoded and quality is identical to the original.
Can I join files of different formats?
Yes — every input is decoded and normalized to the same sample rate before joining, then encoded to the output format you choose (MP3, WAV, or M4A).
Are my audio files uploaded anywhere?
No — FFmpeg runs as WebAssembly in your browser, so the files never leave your device.