How many files can I merge?

There is no hard limit, but browsers start to slow down above ~20 tracks or 500 MB combined. For larger jobs, merge in batches.

Do I need to match sample rates?

No. The merger renders every source into a single OfflineAudioContext so mismatched rates are resampled automatically.

Yes. Each track card has a remove button. You can also drag to reorder at any time before merging.

Audio MergerLocal

Merge multiple MP3 and WAV files into one. Drag to reorder and add crossfades between tracks.

Drop MP3 or WAV files here

or click to browse

⎆Your audio never leaves your browser. All merging and encoding happens locally.

How to use Audio Merger

Add your files
Drop multiple MP3 or WAV files. Each file appears as a card with its duration.
Reorder the tracks
Drag the handle on each card to arrange the tracks in the order you want them merged.
Set crossfades
Adjust the crossfade slider between tracks — default 50 ms blends gaps smoothly.
Preview the merge
Play the combined output to check transitions before exporting.
Export the merged file
Pick MP3 or WAV and download the single merged audio file.

Frequently asked questions

How many files can I merge?: There is no hard limit, but browsers start to slow down above ~20 tracks or 500 MB combined. For larger jobs, merge in batches.
Do I need to match sample rates?: No. The merger renders every source into a single OfflineAudioContext so mismatched rates are resampled automatically.
Can I remove a file after adding it?: Yes. Each track card has a remove button. You can also drag to reorder at any time before merging.

Combine multiple audio files into one with optional crossfades.