Audio Joiner

Drag a track by its handle to a new position, or use its up and down buttons. Keyboard users can select a handle with Space and move it with the arrow keys. The merged file follows the list from top to bottom.

This audio joiner accepts MP3, WAV, M4A, FLAC, OGG, and AAC files in one list. Each input is validated and decoded before merging. Choose one output format for the entire result; it does not keep separate file formats.

This tool decodes each track, uses 44.1 kHz audio, and encodes one output file. It keeps mono when all sources are mono; otherwise it uses stereo. WAV and FLAC use 16-bit samples. Lossy output encoding can introduce further quality loss.

Add at least two tracks. The limit is 10 files on desktop and 5 on mobile, with total input budgets of 200 MB and 100 MB. Output and working-memory checks can reject larger merges before encoding.

The total uses each track's selected duration minus any crossfade overlaps. If an input duration cannot be read yet, the total stays pending until it is verified by the processing engine.

Yes. Drag waveform handles to trim each track, or move the selection without changing its length. Start and End fields appear once a track is trimmed. Crossfade all tracks applies one duration and curve to every adjacent pair. You can also fade the beginning or end of the merged audio. Each track must be long enough for the chosen crossfades.

Yes. Add, remove, reorder or trim tracks, change transitions or output settings, then merge again. The previous result stays available with its saved settings. A failed or cancelled attempt keeps that download; clearing all tracks also clears the result.

Your audio is processed locally in your browser and is not uploaded for merging. The browser may download the FFmpeg processing engine from a CDN; that download does not send your audio. Keep the page open until the result is ready.