At a glance
- Cost
- 100% free, no account
- How many files
- As many as your device's memory allows
- Between tracks
- Crossfade or silence, up to 5 s
- Formats
- Mix MP3, WAV, M4A, FLAC and more in one project
- Saves
- MP3 or WAV
- Privacy
- Stays on your device
Combining files
- Add every file you want in the final track. They can be different formats and lengths.
- Arrange the order with the arrow buttons. The running total shows the length of the result.
- Set the transition: a crossfade for smooth blending, a gap for clear separation, or neither for a straight join.
- Export the combined track as MP3 or WAV.
Choosing a transition
Straight join
Both settings at 0. Tracks butt up against each other, perfect for re-assembling a recording that was split into parts.
Crossfade
The next track fades in while the current one fades out, using an equal-power curve so loudness stays even. Try 3–5 s for music mixes.
Gap
Silence between files, e.g. 2 s between audiobook chapters or exam listening sections. A gap replaces the crossfade.
What people join
- Phone or dictaphone recordings that were saved in several chunks.
- Podcast parts: jingle, main conversation, sponsor read and outro.
- A workout, wedding or party playlist, made into one seamless file.
- Audiobook or course chapters, merged for simpler playback.
- Language-learning drills with pauses for repeating after the speaker.
Every file is resampled to a common rate automatically, and mono files are upgraded to stereo so the result is consistent from start to finish.
Common questions
Is there a limit to how many files I can combine?
There's no set limit. The practical ceiling is your device's memory. Several hours of audio are usually no problem on a computer.
Can I mix MP3 and WAV files in one project?
Yes. Every supported format can be combined, including M4A, FLAC and OGG.
Will the volume jump between tracks?
The joiner doesn't change levels. If some files are much quieter, run them through the Volume Booster first.
Are my files uploaded?
No. Combining happens entirely in your browser.