Online Audio Merger

You can merge any combination of FLAC, WAV, AIFF, MP3, AAC, OGG, M4A, and OPUS files. Files don't need to be in the same format -- the merger handles conversion automatically.

Yes. After adding files, drag the handle on each row to rearrange the merge order. The files will be combined in the order shown.

Choose from no transition (direct join), crossfade (smooth blend), fade in/out, silence gap, or reverse effect. You can set the transition duration from 0.1 to 10 seconds.

There's no hard limit, but merging many large files depends on your device's memory. Most devices handle 20+ files without issues.

Yes, 100%. All files stay on your device. Merging happens in your browser using Web Audio technology. Nothing is uploaded to any server.

Yes. This audio merger runs entirely in your browser tab -- there's nothing to download or install, no account to create, and no plugin required. Drop in your files, choose an order and transitions, and export the merged result directly. It works the same way on Windows, Mac, Linux, and most mobile browsers.

Concatenating audio means joining files back-to-back with a hard cut at each boundary -- the simplest kind of merge. Merging in this tool goes further: it lets you reorder tracks first, then apply a transition at each boundary -- crossfade, fade in/out, a silence gap, or a reverse effect -- so joins don't sound abrupt. If you just want a clean, instant splice with no processing, choose "no transition"; that's equivalent to a straight concatenation.