About this tool
Combine voice memos, podcast segments, chapters of an audiobook, or samples into a single file. Files are joined in the order you add them, resampled to a common format, and exported as one MP3. Different input formats and bitrates can be mixed freely.
Everything happens inside your browser. Your file is never uploaded to a server: the conversion runs on your own device using WebAssembly, and the result is downloaded straight from memory. Close the tab and nothing is left behind.
How to use it
- Drop your MP3 files into the box above, or click to browse. Nothing is uploaded.
- Adjust the options if you want; the defaults suit most files.
- Click the button and wait a moment.
- Download the results individually or all at once as a ZIP.
Frequently asked questions
How do I control the order?
Files are merged in list order. Add them one at a time in the sequence you want, or remove and re-add to rearrange.
Is there a gap between files?
No gap is added. Trim silence from the ends of each file first if you want them tighter.
Is this really free?
Yes. The site is supported by ads, and there are no limits on how many files you convert.
Are my files uploaded anywhere?
No. The converter runs entirely in your browser. Files stay on your device, which also makes it faster than upload-based converters for anything larger than a few megabytes.
Is there a file size limit?
The only limit is your device's memory. Images and audio of any normal size are fine; for video, files under about 500 MB work well on most laptops and phones.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox, and Safari on desktop and mobile. Very old browsers without WebAssembly support will not work.