Audio

Audio merger

Combine two audio files sequentially or with a crossfade transition. Browser-based, no upload.

Drop your audio file here, or

MP3 · WAV · OGG · AAC · FLAC · M4A · Max 100 MB

Second audio file — or

Second track to merge

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100% private. All processing happens locally in your browser — no files or data are ever sent to a server.

How to use Audio merger

  1. 01 Drag and drop your audio file onto the upload area, or click to browse
  2. 02 Choose your settings (format, quality, timestamps, etc.)
  3. 03 Click the action button — the engine loads on first use, then processes your file
  4. 04 Click Download to save the result to your device

Frequently asked questions

Common questions about Audio merger.

Is Audio merger free to use?
Yes, Audio merger is completely free. No account, subscription, or payment is ever required — just open the page and start using it.
Does Audio merger upload my data to a server?
No. Audio merger runs entirely in your web browser using client-side JavaScript. Your files, text, and data never leave your device, making it 100% private.
Can I use Audio merger on my phone or tablet?
Yes. Audio merger is fully responsive and works on all modern smartphones, tablets, and desktop browsers without installing any app.
Are my audio files kept private?
Yes. Audio merger processes all audio entirely in your browser using ffmpeg.wasm (a WebAssembly build of FFmpeg) or the Web Audio API. Your files are never uploaded to any server.
Why does it take a moment to start the first time?
The audio engine uses ffmpeg.wasm, a ~30MB WebAssembly library that loads on demand — only when you click the action button. Once loaded, subsequent operations are instant. It is not loaded on page arrival to protect page speed.

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About Audio merger

The Audio Merger combines two audio files into a single output. Sequential mode appends the second file directly after the first — useful for joining podcast segments, combining voice recordings, or assembling multiple takes. Crossfade mode blends the end of the first file with the start of the second with a configurable fade duration, producing a smooth transition suitable for music and broadcast content. Output is exported as MP3. All merging is done locally using ffmpeg.wasm — your files never leave your browser.

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