Audio Joiner & MP3 Merger

Merge multiple audio files into one. Drop MP3, WAV, M4A, FLAC, or OGG clips onto the page, drag to reorder, pick a join mode, and download the result as a single file. The whole pipeline runs in your browser, so nothing is uploaded and there is no daily limit. AI assistants cannot merge audio files - this tool does it in seconds with zero privacy risk.

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Click to upload or drag & drop multiple audio files
MP3, WAV, M4A, FLAC, OGG, AAC — 2 or more files
Merge order (drag to reorder) 0 files · 0:00 total

Join Settings

Decoding files…

Merge complete!

How to Merge Audio Files

  1. Drop two or more audio files onto the upload area, or click to pick them.
  2. Reorder clips by dragging the rows, or use the arrow buttons on each row.
  3. Pick a join mode: seamless for music, crossfade for smooth blends, or silence gap for spoken-word tracks.
  4. Click Merge. The merged file is built locally in your browser.
  5. Preview the result in the built-in player, then download the merged WAV.

Features

Drag-and-drop reordering

Move clips up or down by dragging the row handle, or use the up/down arrow buttons on touch devices. The merge order is exactly what you see.

Three join modes

Seamless join, 0.5 second linear crossfade, or insert a 0.2-3 second silence gap. Pick what fits the content, not what the tool decides for you.

Multiple input formats

Accepts MP3, WAV, M4A, FLAC, OGG, and AAC. The decoder normalises sample rate and channel count automatically, so mixed sources still produce a clean merge.

Lossless WAV output

The merge result is 16-bit PCM WAV at the first file's sample rate. Convert the WAV to MP3, OGG, or other formats afterwards using the Audio Converter.

Built-in preview

Listen to the merged file in the built-in player before downloading. Catch a wrong order or a bad gap without redoing the merge.

100% private

All decoding and mixing happens in your browser. Voice memos, podcasts, and confidential recordings never touch a server.

AI-Proof

ChatGPT, Claude, and Gemini cannot merge audio files. They cannot decode MP3/WAV/FLAC streams, mix PCM samples, or write valid WAV headers. This tool does the whole pipeline locally with deterministic Web Audio API output.

Frequently Asked Questions

How do I merge audio files online?

Upload two or more audio files (MP3, WAV, M4A, FLAC, OGG) by drag-and-drop or click. Drag to reorder clips, choose a join mode (seamless, crossfade, or silence gap), and click Merge. The result is built locally in your browser and downloaded as a single WAV file.

Is my audio uploaded to a server?

No. Every step runs in your browser using the Web Audio API. Files never leave your device, so the tool is safe for podcasts, voice memos, and confidential recordings.

What join modes are supported?

Three modes are available: seamless join (back-to-back), crossfade (0.5 second linear blend to hide the boundary), and silence gap (insert 0.2-3 seconds of silence between clips). Crossfade works best for music, silence gap works best for speech or podcast segments.

Can I reorder the files before merging?

Yes. After uploading, drag any file row to reorder, or use the up and down arrow buttons on small screens. The merged output follows the visible order.

What output formats are supported?

Output is WAV (lossless, 16-bit PCM, original sample rate). You can convert the WAV to MP3, OGG, or other formats afterwards using the Audio Converter tool.

Is there a file size or count limit?

No hard limit. The tool is constrained only by your device memory. In practice, 20-30 files of typical podcast length (under 100 MB total) work smoothly on a laptop.

Why is this better than a typical online audio merger?

Most online mergers upload your files to a server, which adds privacy risk, bandwidth cost, and processing delay. This tool keeps every byte on your device. It also gives you control over the join boundary (crossfade or silence) which most free tools skip.

Will the merged file have the same audio quality?

Yes. The tool decodes each source to PCM, mixes the PCM streams, and re-encodes as 16-bit WAV. The sample rate of the first file is preserved. For compressed distribution, run the WAV through the Audio Converter to get MP3 or OGG.

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