How to join audio files online
- Drop several audio files into the upload box at once — you can keep adding more later.
- Arrange the queue with the up/down buttons and remove anything you do not need; each row shows the track's length.
- Set an optional crossfade (0–3 seconds) between tracks.
- Press Merge tracks, preview the combined result, then download it as MP3 or WAV.
This audio joiner and merger turns a folder of separate clips into one continuous file: voice memo fragments into a single note, podcast segments into an episode, favorite songs into a workout mix, or sound effects into one cue. Mixed formats are fine — everything is decoded and resampled to a common rate before being stitched together, and the optional crossfade smooths each seam so the result sounds intentional rather than spliced.
Like every SoundForge tool it runs entirely in your browser: files are merged on your device, never uploaded, with no signup, length caps or watermarks. Need to tidy a clip before joining? Cut it down with the Audio Trimmer first, then drop the pieces here.
FAQ
Can I merge audio files of different formats and sample rates?
Yes. You can mix MP3, WAV, FLAC, OGG, M4A — anything your browser decodes — in one queue. Every file is automatically resampled to the sample rate of the first track before merging, so the joined result plays at a consistent speed and pitch.
How do crossfades between tracks work?
A single slider sets a crossfade of up to 3 seconds that is applied between every pair of neighboring tracks: the end of one fades out while the start of the next fades in. Set it to 0 for hard cuts; it is also automatically capped so it can never exceed half of your shortest track.
Is there a limit on how many files I can join?
There is no fixed file count or duration cap. The practical limit is your device's memory, because all tracks are decoded to raw audio before merging — joining dozens of full-length songs may get slow on phones, while shorter clips are no problem at all.
Is the audio joiner free, and do my files get uploaded?
Completely free, no account needed, and nothing is uploaded — decoding, merging and crossfading all run in your browser. The merged track downloads as a 320 kbps MP3 or WAV.