Merge Audio Files — Concat to MP3 | Input and conversion guide
Joins selected audio files in order into one MP3 file and applies the requested bitrate.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
How to use this tool
Arrange clips in final playback order and listen ahead for differing sample rates or volume levels.
Results and examples
Listen at joins for total duration and loudness changes before deciding whether further editing is needed.
Worked example
Join two announcements recorded with the same settings and listen for unwanted silence or loudness changes at their boundary.
Limitations
- The concat demuxer expects compatible streams; arbitrary codec, sample-rate, and channel combinations may fail.
- Clips are joined sequentially without mixing, crossfading, or loudness normalization.
Fields
| Field | Guidance and constraints |
|---|---|
| Bitrate | 128 kbps / 192 kbps / 256 kbps / 320 kbps |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Can I place speech over background music?
No. This joins clips end to end rather than mixing them simultaneously.
Why does loudness jump between clips?
The workflow does not normalize loudness, so differences in the recordings remain.
Related tools
You do not need to start over. Continue with the tool that fits your next step.
