About the Audio Joiner
Audio Joiner puts several audio files one after another and saves them as a single WAV file. Add up to 20 files, put them in the order you want with the move buttons, choose a gap of half a second to two seconds between the clips if you like, and press Join. Files can be in different formats, and clips with different sample rates or a mix of mono and stereo are converted so that they match. The tool works on your device and nothing is uploaded. The result is an uncompressed WAV, which is much bigger than an MP3, and clips are joined directly with no cross-fade, so a click may be audible if a clip doesn't start and end quietly.
Updated September 2026
How to use the Audio Joiner
- 1Select two or more audio files. You can add more afterwards.
- 2Use Move up and Move down to put the clips in order, and Remove to drop one.
- 3Choose a gap, the output channels and the sample rate, or leave the defaults.
- 4Press Join and save as WAV to download joined.wav.
Joining audio files in order
Select your files and they appear as a list, each with its length, sample rate and whether it is mono or stereo. The list order is the order of the final track. Use Move up and Move down to rearrange, and Remove for a file you don't want. The panel below shows the number of files and the total length, including any gaps.
When you press the button the tool converts each clip, joins them and saves joined.wav. A label shows which clip it is working on.
Gaps and clicks between clips
Clips are joined directly, with no cross-fade. If one clip ends on a loud part and the next starts on a loud part, the sudden change can make a small click. A gap of half a second is usually enough to hide it, and it also gives the listener a moment between tracks. For speech, one second between sentences sounds natural.
Different formats and sample rates
- Any file your browser can play can be added, whatever its format.
- Highest of the clips keeps the best quality among them, which is the default.
- Choose 44100 or 48000 Hz if you need a standard rate for video or CDs.
- Match the clips gives stereo if any clip is stereo, otherwise mono.
- A mono clip in a stereo result plays the same sound in both ears.
Why the result is a WAV file
The page has no MP3 encoder, so the joined track is saved as an uncompressed WAV. A minute of stereo audio at CD quality is about 10 MB. WAV opens in almost every player and editor, and you can convert it to MP3 or M4A afterwards if you need something smaller.
To cut a clip before you join it, use Audio Trimmer. To record something new, try Voice Recorder, to make speech from text see Text to Speech, and to capture your screen use Screen Recorder. Joining PDFs instead? That is Merge PDF.
Features
- Join up to 20 files in the order you choose
- Mix formats such as MP3, M4A, OGG, FLAC and WAV
- Optional silent gap between clips
- Mono, stereo or matched to the clips
- Sample rate conversion when the clips differ
- Progress while joining and no upload
Frequently asked questions
How do I join two audio files?
Select both files, check that they are in the order you want, and press Join and save as WAV. The second file plays straight after the first. Use the arrow buttons on each row to change the order.
What format does the joined file have?
It is a WAV file, which is uncompressed 16-bit audio. That makes it much larger than an MP3. The page cannot write MP3 files, so if you need a smaller file, convert the WAV with another program.
Can I join different formats like MP3 and M4A?
Yes, as long as your browser can open each file. The tool decodes every file to raw sound first, so the original formats don't matter. If a file can't be read, it is marked with a message and skipped.
How do I add silence between clips?
Choose a gap of 0.5, 1 or 2 seconds under Gap between clips. Silence of that length is placed between each pair of clips, but not after the last one. A short gap also hides clicks at the joins.
Is there a limit on file size?
You can join up to 20 files at once. Audio takes much more memory once decoded than it does as an MP3, so the total is limited to about 250 MB of decoded sound, which is roughly 12 minutes of stereo audio at 44.1 kHz.
Are my files uploaded?
No. Your browser reads and joins the files on your device, and nothing is sent to a server. The original files are not changed.
What happens if the clips have different sample rates?
They are converted to one sample rate, by default the highest among your clips. The conversion uses linear resampling, which is fine for speech and most music but is not meant for studio work.