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Audio Cutter & Joiner (MP3 Splitter)

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)

  1. Pick Split / Cut to trim one file, or Join to merge several.
  2. For cutting, set the start and end time (the Playhead buttons grab the player position); for joining, add files and arrange their order.
  3. 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.

More Video & Audio Tools

  • Video Trimmer & Muter — Trim a clip by start/end time or strip the audio track — processed on your device with FFmpeg WebAssembly, no upload.
  • Video to Audio Converter (Extract MP3) — Extract the audio track from any video as MP3, WAV, M4A, OGG, or FLAC — converted on your device with FFmpeg WebAssembly, no upload.
  • Video Joiner (Merge Clips) — Combine multiple video clips into one file — fast stream-copy for same-source clips or re-encode for mixed formats, all in your browser.
  • Add Audio to Video — Attach one or more audio tracks to a video — replace the soundtrack or mix music and narration over the original sound, with no upload.
  • Video to GIF Converter — Turn a video clip into a high-quality animated GIF — pick the section, size, and frame rate; converted on your device, no upload.
  • Images to GIF Maker — Turn a batch of images into one animated GIF — drag to reorder frames, set the speed, size, and looping. Mixed sizes are normalized automatically. Encoded on your device, never uploaded.
  • Subtitle Burner — Add and time captions, or import an .srt, then hard-burn them onto a video — font, color, outline, and position controls. Rendered on your device with FFmpeg, exports MP4.
  • Audiogram Maker — Turn an audio clip + a background image or color into a waveform video for feeds — square, portrait, story, or landscape. Rendered on your device with FFmpeg, exports MP4.