About Audio Joiner
Joining audio sounds trivial until the files disagree: one is a 44.1 kHz MP3, another is a 22 kHz voice memo, a third is a stereo WAV from an editor. Simply gluing the bytes together produces breaks, speed changes or silence. The reliable way is to decode every input, normalise it to the same sample rate and channel layout, and then concatenate the audio.
This joiner accepts two to ten files, shows them in a list you can reorder with arrow buttons, and does exactly that normalisation on our server before encoding one MP3 or WAV. The combining step adds no gaps: tracks follow one another directly. The total upload is limited to 100 MB and everything is deleted from the server after your download.
What this tool does
Order controlled by you
Files are listed in the order they will be joined, with up and down buttons to move each track and a remove button for mistakes.
Mixed formats accepted
MP3, WAV, M4A, AAC, FLAC, OGG, OPUS and WMA files can be combined in one job; the server decodes each and re-encodes them into a common format.
Common sample rate and channels
Every input is normalised to 44.1 kHz stereo before concatenation, so joining a mono memo to a stereo song keeps the timing correct throughout.
MP3 or WAV output
Produce a small MP3 at 128, 192 or 320 kbps, or a WAV when the joined result will be edited or archived.
2 to 10 files, 100 MB total
The list shows the file count and combined size, and the tool refuses a job that exceeds the limits before anything is uploaded.
Clean automatic cleanup
All uploaded files and the joined track are written to a temporary directory and deleted automatically after the download.
How to use Audio Joiner
- 01
Add the audio files
Drop two or more files into the workspace or click Choose files. Up to ten files are accepted, 100 MB in total.
- 02
Put them in order
The list joins from top to bottom. Use the up and down arrows on each row until the playback order is right.
- 03
Choose the output format
Pick MP3 for a portable file or WAV for uncompressed output, then choose the MP3 bitrate if needed.
- 04
Join and download
Click Join files, watch the upload and processing progress, then listen to the result and download it.
Supported formats and limits
- Input
- MP3WAVM4AAACFLACOGGOPUSWMA
- Output
- MP3 / WAV
- Processing
- Server-side FFmpeg job in a temporary directory, deleted after download.
- Maximum size
- 100 MB total
- Requirements
- Chrome, Edge, Firefox or Safari · Server-side FFmpeg conversion
Limitations worth knowing
- Between 2 and 10 files per job, with a combined upload limit of 100 MB.
- Inputs are normalised to 44.1 kHz stereo, so multichannel information and very high sample rates are reduced.
- MP3 output is lossy and all metadata, artwork and chapters are dropped.
- DRM-protected files cannot be decoded, and a three-minute processing cap applies.
Privacy and file handling
The audio files are uploaded to a temporary directory on our server, decoded and joined with FFmpeg, and the result is streamed back as a download. Every upload and the joined track are deleted automatically when the download finishes; nothing is stored permanently or shared.
Read the full privacy policy