Audio Joiner: Merge Audio Files

Guide & FAQ
Drop two or more audio files here, or click to choose MP3, WAV, M4A, OGG and more. Reorder, add a crossfade, save as one file. Free, no signup.

Guide: Audio Joiner: Merge Audio Files

How to merge audio files

Drop two or more audio files on the page or click to choose them. They appear in a list in the order you added them. Use the arrows to reorder, the cross to remove a clip, and Add more clips for further files.

Crossfade

Leave the crossfade at 0 seconds to play the clips back to back. Move the slider to 1 to 5 seconds to blend them: good for music mixes and podcast intros. The crossfade is automatically shortened if a clip is shorter than the overlap.

Preview and save

  • Press Preview start to hear the first 30 seconds of the joined result.
  • Choose MP3, M4A or WAV and a quality.
  • Press Join clips, then Download.

Good to know

The joined file is encoded once, so there is a single generation of loss for MP3 or M4A. Peaks that would clip in a crossfade are softly limited. Everything happens in your browser on your own device.

FAQ

How many clips can I join?

As many as your device memory allows. The tool sets no limit of its own; a laptop easily joins dozens of songs, a phone is better with a handful.

What is a crossfade?

A crossfade overlaps the end of one clip with the start of the next, fading one out while the other fades in, so the join sounds smooth instead of abrupt. It uses an equal-power curve, so the volume stays steady in the middle.

Can I join different formats and sample rates?

Yes. Clips can be a mix of MP3, WAV, M4A, OGG and more. They are matched to the sample rate of the first clip (or the rate you choose) and joined as stereo, or mono if any option says so.

How do I change the order?

Use the up and down arrow buttons next to each clip, then press Join clips. The preview button plays the first 30 seconds of the result so you can check the transitions.

Which output format should I use?

MP3 for compatibility, M4A for better quality at the same size, WAV for no further loss. Joined audio is re-encoded once, so choose a high bitrate such as 192 kbps for music.

Is my audio uploaded?

No. The clips are decoded, mixed and encoded in your browser. The tool makes no upload requests.

Open-source licences

  • lamejs (LAME MP3 encoder, JavaScript port): LGPL-3.0