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Audio Merger

Combine multiple audio files into one with smooth crossfade. 100% in your browser —no uploads needed.

No Upload Required Smooth Crossfade WAV Output Multi-file

Drop your audio files here

or click to browse (select multiple)

Supported: .mp3, .wav, .ogg

100% Private

Files never leave your device

Crossfade

Smooth transitions

WAV Output

Lossless export

How It Works

Three simple steps —everything happens in your browser.

Add audio files

Select or drop multiple audio files in the order you want them merged.

Set crossfade

Adjust the crossfade length so clips blend smoothly without clicks.

Download

Merge and download the combined clip as a lossless WAV file.

Why choose Ercc Audio Merger?

100% Private —No Server Uploads

Your audio files never leave your device. All processing uses the Web Audio API locally in your browser.

Smooth Crossfade

Adjacent clips overlap and blend with a linear crossfade, removing harsh clicks at the joins.

Lossless WAV Export

Export the merged clip as a lossless WAV file, ready for further editing or sharing.

Pro Tips

●Add files in the exact order you want them to play.
●A short crossfade (0.3–1s) avoids clicks without losing content.
●Set crossfade to 0 for a hard cut with no overlap.

Frequently Asked Questions

Is my audio file uploaded to a server?

No. All processing happens 100% in your browser using the Web Audio API. Your files never leave your device, ensuring complete privacy and security.

What does crossfade do?

The end of one clip fades out while the start of the next fades in over the overlap, creating a smooth transition with no abrupt click.

Can I merge different formats?

Yes. Files are decoded to the same sample rate internally, so MP3, WAV and OGG can be merged together into one WAV.

What format is the output?

The merged clip is exported as an uncompressed WAV file, which is lossless and ideal for further editing.