Updated
To merge audio, drop the files in the order they should play, choose an output format and download a single combined track. The files are placed back to back, with nothing inserted between them.
Merging suits a session your recorder cut into several parts, a chapter of an audiobook that should be a single file, or an episode built from separate pieces.
The join happens on our servers in Germany, not in your browser. Your files travel there over an encrypted connection, and we delete them automatically within two hours.
Mixed formats in one merge
The files do not need to match. A WAV voice-over, a clip a phone saved as M4A and an MP3 jingle can all go into the same merge. We decode every file, convert them all to one shared format (44.1 kHz stereo), join them, and then encode the result once in the format you picked. A mono recording plays equally on the left and right channels.
Choosing the output format
- MP3 is the default. It suits anything you plan to post online or send to others, and it uses variable bitrate at quality 2, usually 170 to 210 kbps.
- FLAC or WAV, both lossless, suit a result that is going back into an editor.
- M4A or AAC are encoded at 192 kbps.
- Opus at 128 kbps gives the smallest file that still sounds good.
Joining costs no quality by itself. The one encode at the end is lossy when the output is MP3, AAC, M4A, OGG or Opus, as any save in those formats is. At these settings, normal listening will not reveal it.
Silence, gaps and order
We add no silence between files, and we remove none either. Quiet stretches that open or close a file stay in the merge, so for tight joins, cut them away first with trim audio.
The order is the upload order. If a file lands in the wrong place, remove the files and add them back in playing order.
Long merges and limits
Each file can be up to 50 MB, or up to 500 MB on Pro. Without an account a merge combines up to 5 files, and a free account raises that to 10. Longer projects, such as every chapter of an audiobook, need Pro, which takes up to 500 files in one merge, or credits, where one credit covers 25 files. Keep in mind that every file in a merge counts toward your daily allowance of server jobs, and Pro has no daily allowance at all.
How to join recordings into one track
- Add your recordings to the page, starting with the one that plays first.
- Leave MP3 selected or switch to another output format.
- Start the join with the Merge button.
- Save the finished track.
FAQ
Can the tracks crossfade into each other?
No. Each file starts right where the previous one stops, with no fade and no overlap.
Why is the merged file stereo when my recordings were mono?
Every file is converted to stereo so that any mix of recordings can be joined. A mono voice plays at the same level on both sides.
Does a 48 kHz recording lose anything?
It is resampled to 44.1 kHz, the CD standard. Nothing you can hear is lost in that step.
Can I put a video into the merge?
No, only audio files can be merged. To use the sound from a video, pull it out first with extract audio from video.