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Merge Audio Files with an API

Join two to six audio files (voiceover chunks, podcast segments, TTS parts) into one normalized MP3 or WAV. Run the preset directly on this page or call the same agent-ready endpoint from your product.

Run this tool View API recipe
LIVE TOOL
Run merge audio
Drop a video, adjust the defaults if you need to, and download the result here.

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BEFORE / AFTER

See what the tool changes.

A real example: the after side is the unedited output of a KinoPipe job. Run the live form above to generate the same result from your own media.

BeforeSeparate audio files
Source audio48 kHz · stereo
2 sources · MP3
AfterOne audio file
Ready
Merged audio48 kHz · stereo
Tracks joined in order at 44.1 kHz stereo
1 normalized MP3

Rendered from the same pipeline the API and MCP tools call.

Useful defaults, typed options.

The tool slug stays stable while your agent supplies named media inputs and a narrow set of documented options.

  • Two to six inputs
  • Mixed formats and sample rates
  • Video inputs contribute their audio track
What this preset does
  1. 01Download every audio input
  2. 02Normalize sample rate and channels
  3. 03Join tracks in the supplied order
  4. 04Encode one MP3 or WAV
Stable endpointPOST /api/v1/tools/merge-audio
Live API request
{
  "inputs": [
    { "id": "main", "url": "https://example.com/part-1.mp3" },
    { "id": "clip-2", "url": "https://example.com/part-2.mp3" }
  ],
  "options": { "format": "mp3" }
}
Successful output example
{
  "result": {
    "output": {
      "filename": "merge-audio-output.mp4",
      "contentType": "video/mp4",
      "byteSize": 437021,
      "downloadUrl": "https://cdn.kinopipe.com/…"
    }
  }
}

Know the boundaries before you run.

Upload files up to 300 MB or use public HTTP(S) URLs.
A successful run consumes at least one credit.

About merge audio

Yes. Every input is resampled to 44.1 kHz stereo before joining, so MP3, WAV, M4A and even video files can be combined.

The job is rejected with a typed error before rendering, naming the input that has no audio.

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