Audio Merge

Combining multiple audio files into a single continuous track is a common task for podcast producers, musicians, audiobook creators, and sound designers. Our browser-based audio merger handles sequential concatenation and smooth crossfade transitions entirely client-side using FFmpeg WebAssembly.

You can merge files of different formats — for example, combine MP3 and WAV segments — and the tool normalizes them to a consistent output format. Files are joined in the order you arrange them, and you can drag to reorder before merging. The crossfade setting creates smooth "mix" transitions between segments by overlapping the tail of one file with the head of the next, blending volumes for a natural join.

This tool is ideal for podcast episode compilation, musical album sequencing, assembling audiobooks from chapter recordings, or building ambient soundscapes from separate sound effect layers. Because everything runs in your browser with no server round-trip, you can merge files of significant size without upload delays or bandwidth constraints.

The audio merger supports configurable crossfade duration between segments. When crossfade is enabled, the end of each audio segment is mixed with the beginning of the next over a user-defined duration (e.g., 2 seconds). This eliminates abrupt cuts between tracks, producing professional-sounding transitions ideal for podcast chapters, DJ sets, ambient music, and audiobook parts. Without crossfade, the merger performs a clean, gapless sequential join preserving original dynamics.