Audio joiner
Put a presentation recorded in parts, voice messages that came in pieces, or a playlist into a single file. Reorder, choose the transition, download.
Free · no sign-up · your file is processed in your browser and never sent to a server
No file handy? Try it with a 20-second Turkish meeting recording.
How to use
- Add your filesSelect all the files you want to merge, or drop them one by one. Formats can be mixed (MP3, WAV, M4A, OGG…).
- Set the order and transitionUse the up and down buttons to reorder. Choose back to back, silence in between, or crossfade.
- Merge and downloadPick an output format and press "Merge". Listen to the result and download a single file.
Three ways to join
| Option | What it does | Good for |
|---|---|---|
| Back to back | Files are joined with no gap; a few milliseconds of fade at each joint prevents clicks. | One recording split into parts, lecture or meeting segments |
| Silence in between | Adds silence of the length you choose (0.5–5 s) between files. | Audiobook chapters, announcement lists, listening tests |
| Crossfade | The end of one file overlaps the start of the next (0.5–5 s). | Playlists, podcast intros, background music |
Files in different formats and quality
Your files can differ in format, sample rate or channel count. The tool brings them all to the highest sample rate and spreads mono files evenly across both channels of a stereo output, so you can join a phone recording with a studio recording.
If the levels are very different, normalize the quiet file first with the volume booster; the merged file will have fewer jumps in loudness.
Privacy: your files never leave your device
Everything happens in your browser. Your file is not sent to Voiser's servers or stored anywhere, and it's cleared from memory when you close the tab. That's also why the tool stays fast on a slow connection.
You can merge up to 20 files and 600 MB in total at once.
Common questions
How many files can I merge?
Up to 20 files at once, 600 MB in total. For more, merge one batch first and then merge the result with the rest.
Can I merge MP3 and WAV together?
Yes. Files with different formats, sample rates and channel counts are brought to a common format and joined. You choose the output format.
Will there be a click where files meet?
No. Even in "Back to back" mode, a fade of a few milliseconds is applied at each joint, which prevents the click caused by a sudden jump in the waveform.
Can I trim the parts before merging?
This tool joins files as they are. Trim the unwanted starts and ends with the MP3 cutter first, then merge them here.
Are my files uploaded to a server?
No. Merging happens in your browser; your files aren't sent to Voiser or anywhere else.
Related tools
- MP3 cutter and audio trimmerSelect any part of an audio file on the waveform and cut it out.
- Audio converterConvert files between MP3, WAV, M4A, OGG and FLAC.
- Silence removerAutomatically find and remove long silences in a recording.
- Volume boosterMake quiet recordings louder, or normalize them, without clipping.
- Audio to video makerTurn an audio recording into a video with a moving waveform.
Add a professional intro to your merged audio.
Text to Speech reads your script in a natural voice: prepare openings, closings and chapter announcements in minutes.