Joining MP3 files

MP3 Trimmer is not limited to trimming or dividing files. It can also join several MP3 files into one combined file.





Adding files to join

Choose 'Tools>Join MP3 files' from the menus, or press Cmd-J. The Join MP3 window will appear. To add MP3 files to the list, simply drag them to the Join MP3 window.

As soon as the list contains more than one item, the right part of the header ('Kbps/Hz/Ch') will switch to some of these colors:

Green
All files in the list are matching CBR; no problem joining
Yellow
All files in the list are VBR; results not guaranteed
Red
Files are mixed CBR/VBR, or they are CBR with non-matching bitrate/samplerate; joining not allowed.



Sorting and re-arranging the list

On the right side of the list there are two buttons. The Upper one ('A->Z') will sort the list in alphabetical order. The Trash can button will remove the selected item in the list. The files will be joined in the order they appear in the list, from top to bottom. Re-arrange the order of the files by simply dragging them.



Begin joining

When the list is ready, press the button 'Select target folder' and browse to the folder where you wish to save the joined file. Joining will start immediately and the file will be named 'Joined file.mp3'.

Make sure the button '
Keep ID3 tag' is checked if you wish to preserve the ID3 tag data from the first file in the list. This is because an MP3 file may only contain one set of ID3 tag data.



Joining restrictions

When joining MP3's there are some restrictions to be aware of, in order to conform to MP3 standards:
CBR and VBR MP3's cannot be joined together
CBR MP3's must have the same bitrate and samplerate.
VBR MP3's may be joined, but the result cannot be guaranteed (it depends on the type of VBR encoding).
(CBR = Constant bitrate / VBR = Variable bitrate)