Audio Merger
Combine multiple audio files into one seamless track. Add smooth crossfade transitions. Output as MP3, WAV, or AAC.
Drop audio files here
MP3, WAV, AAC, FLAC, OGG — up to 20 files, 500MB total
Browser PCM Merging
Small WAV batches are decoded into raw PCM audio buffers, concatenated with gain-curve crossfades, and re-encoded as WAV entirely in your browser — zero server load.
Smooth Crossfades
Set a crossfade duration from 0.5 to 5 seconds. The end of each track fades out while the beginning of the next fades in simultaneously, producing professional DJ-style transitions.
Queued Server Processing
Large or MP3/AAC jobs are queued to a dedicated background worker. Concurrency is controlled to prevent overloading the server, ensuring reliable processing even under heavy demand.
Frequently Asked Questions
When all your files are under 50MB total and you choose WAV output, your browser decodes each audio file using the native Web Audio API, concatenates the decoded PCM buffers with optional gain-based crossfades, and re-encodes the result as a WAV file — entirely locally.
Two conditions force server mode: (1) total file size exceeds 50MB, or (2) you choose MP3 or AAC output, since browsers can't encode those formats natively. The server worker processes these with advanced audio tooling supporting full crossfade and compression.
Crossfade overlaps the end of one audio file with the start of the next, applying a fade-out to the first and a fade-in to the second simultaneously. This creates a smooth transition instead of a sudden cut, ideal for music playlists or presentations.
Yes — use the ↑ and ↓ arrow buttons next to each file to reorder them before merging. Files are merged in the order shown from top to bottom.
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