Illustration: MP3 files being merged

Merge multiple MP3 files into a single MP3 with chapters.

This simple online tool allows you to stitch together multiple MP3 files. It is open source, does not require install or signup, and runs locally in your browser. Your files are never uploaded. It adds id3 chapter metadata that is supported by many podcast players.

To start, load your audio files.

or drag and drop files
Drop mp3 files to load.

Edit chapters

Chapters are managed using the same syntax also used by YouTube. Each chapter is one line, starting with the timestamp when the chapter begins (for example 03:20 or using milliseconds 14:21.320), followed by a space, followed by the name of the chapter. Chapters can also have a link and an image associated with them, see below for details.

Podlove Simple Chapters XML and Podcast Namespace JSON

Besides embedded ID3 chapters, other standards for specifying chapters exist. Examples are the Podlove Simple Chapters XML and Podcast Namespace Chapter JSON formats, which can be added to a podcast RSS feed via embedding into the <item> tag (XML) or by adding a link (JSON, XML). While most podcast players use embedded chapters, some other players (notably Spotify) only support time stamps in the episode description or Podlove chapters.

You will need to upload the images to a web server and add the URLs to the chapter list.

                            
                            

Edit MP3 tags

MP3 files can contain metadata such as title, artist, etc., known as ID3 tags. You can edit these tags below.

Cover image
Drop an mp3 file to load.