Merge multiple audio files in sequence with configurable crossfade, no installation needed.
The Audio Joiner concatenates two or more files into one continuous track. You reorder tracks with the ↑/↓ buttons (or by dragging, on desktop), set a smooth constant-power crossfade between them, listen to a preview of the joined result, waveform and junctions highlighted, and download it as MP3 or WAV. Everything runs in your browser through the Web Audio API.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/audio-joiner"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Audio Joiner"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Crossfade is a transition technique where the end of one track fades out while the beginning of the next fades in, creating a smooth overlap. It is ideal for continuous music mixes, soundtracks, or podcasts where abrupt cuts would sound jarring.
Your files are processed locally in the browser. No data is sent to any server.