Merge MP3 combines several MP3 files into one, in the order you choose, so an audiobook, a lecture or a playlist plays as a single file. It runs in your browser, the MP3s are never uploaded, and the result is a normal MP3 that plays everywhere.
How to merge MP3 files
- Choose all the MP3s at once (hold Ctrl or Cmd to pick several), or add them with Add files.
- Check the order and fix it with the arrows.
- Choose what goes between them: nothing, a crossfade or a short silence.
- Leave Save as on MP3, pick the quality, click Join and download.
Getting the order right
Files are listed in the order the browser hands them over, usually alphabetical. That puts “Chapter 10” before “Chapter 2”. Check the list before joining, or number your files with leading zeros (01, 02 … 10) so they sort correctly.
Which quality for the merged MP3
| Content | Quality | Size per hour |
|---|---|---|
| Audiobook, lecture, podcast | 128 kbit/s | about 58 MB |
| Music, mixed content | 192 kbit/s | about 86 MB |
| High-quality music | 320 kbit/s | about 144 MB |
Choose the bitrate of your best source file. A higher one only makes the file bigger.
Common uses
- Audiobooks downloaded as dozens of short tracks: one file is easier to play and to resume.
- Lectures and meetings recorded in parts because the recorder stopped or split the file.
- Playlists and mixes for a party, a workout or a long drive, with a 1 s or 3 s crossfade.
- Voice messages collected into one file, with 1 s of silence between them.
Good to know
- Titles, cover art and chapter marks of the original MP3s are not copied into the merged file.
- For a long audiobook, M4A under Save as gives a similar sound at a smaller size and plays in Apple Books and most players.
- Very long results (many hours) may not fit in a phone’s memory; a computer handles more.