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Free Audio Joiner

Merge multiple audio files into one, in any order, with optional crossfade. Export as MP3, M4A, or WAV. Runs entirely in your browser — no upload.

No file size limitFiles stay privateNo login requiredFree forever

Drop files here, or click to browse

MP3, WAV, FLAC, OGG, AAC, M4A, Audio no file size limit

You can drop multiple files at once

Browse files

Your files never leave your device. All processing happens locally in your browser.

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Join Podcast SegmentsMake a Music MixCombine Voice MemosCombine Audiobook ChaptersBuild a Looping Audio Track

How It Works

Stitching audio files together normally means an upload to an ad-heavy site. This merges them with the real FFmpeg engine running in your browser.

  1. 1
    FFmpeg.wasm loads once
    The WebAssembly build of FFmpeg (~30 MB) downloads on first use and is cached afterwards.
  2. 2
    You add and order your files
    Drop in multiple audio files and arrange them with the up/down controls. Nothing is uploaded.
  3. 3
    FFmpeg concatenates them
    The tracks are joined in order — back-to-back, or with a smooth crossfade between each — using FFmpeg's concat/acrossfade filters, all on your CPU.
  4. 4
    Download the merged file
    The result is encoded once to MP3, M4A, or WAV and offered for download.

No upload, no queue, no watermark. Combine podcast segments, voice memos, or music privately — your audio never leaves your device.

Why use ours?

✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files

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