Merge Audio Files
Join two to four audio clips in upload order.
How to use Merge Audio Files
Join two to four audio clips in upload order.
Choose 2–4 audio clips. Files are joined in order and normalized to common stereo sample settings.
- Open Merge Audio Files on Tools4U.
- Upload the supported audio files in the order you want.
- Adjust any settings, select Process Audio, then wait.
- Preview and download your output within 12 minutes.
Frequently asked questions
Is Merge Audio Files free?
Yes. Signed-in verified users can process short audio, and Premium members do not see advertisements.
What are the upload limits?
Up to 24 MB per file, 48 MB combined, 180 seconds per track, and 10 jobs per hour. Some effects have shorter input limits.
Where is audio processed?
The audio is processed by an isolated private FFmpeg worker. Outputs are temporary, but you should still avoid uploading confidential material without permission.