Loona Audio Joiner - Combine Audio Files Into One Track
An interview in three parts, a song split across files, or lessons recorded separately - this tool stitches audio files together into one clean track. Add your files, arrange the order, and download the joined audio as a WAV file.
How to join audio files
- Click the box above or drag your audio files into it - you can add as many as you like.
- Use the Up and Down buttons to set the exact order the files will play in.
- Click "Join Audio Files" and listen to the combined track in the preview player.
- Download the joined WAV file to your device.
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Frequently Asked Questions
Is the Audio Joiner free?
Yes. It is completely free with no sign-up and no limit imposed by us on how many files you join.
Are my audio files uploaded to a server?
No. Every file is decoded and joined 100% inside your browser with the Web Audio API. Your audio never leaves your device.
Which formats can I join together?
Any mix of formats your browser can decode - MP3, WAV, M4A and OGG. Files with different formats join together fine, and the result downloads as one standard WAV file.
Can I change the order of the files?
Yes. Use the Up and Down buttons next to each file to arrange the exact order before joining.
Will the joined audio lose quality?
No. The tool places the original samples of each file one after another - nothing is re-compressed - and saves the result as WAV.
How it works
Each file you add is decoded inside your browser into raw sound samples with the Web Audio API - nothing is uploaded to any server. When you press Join, the tool lines up the samples of the first file, then the second, then the third, in exactly the order shown in your list, and writes them into one new WAV file.
Worked example
You recorded a lesson in three pieces: intro.mp3 (0:20), the main lesson (6:10) and a short closing note (0:15). You add all three, drag the closing note to the bottom of the list, and press Join. A moment later you have one 6 minute 45 second WAV file that plays straight through, ready to share with your class.
Files in different formats join together without any extra steps, because your browser first decodes them all into the same raw sample format.
More questions
What if my files have different sample rates or channels?
Your browser decodes every file to the same working sample rate automatically, and mono files are matched to stereo when needed, so mixed files still join into one clean track.
How many files can I join at once?
There is no fixed limit. Very large sets depend only on your device's memory, because all files are decoded in the browser.
Can I listen to the joined track before downloading?
Yes - after joining, an audio player appears so you can listen to the full combined track before you save it.
What happens if one file will not load?
That file is marked in the list and joining continues with the files that did load. A file usually fails because its format is not supported by your browser or it is corrupted - converting it to MP3 or WAV first normally fixes it.