Audio Joiner Online: Merge Audio Files Without Clicks
Join multiple audio files into one, with equal-power crossfades or silent gaps at every seam instead of clicks.
Concatenating audio files is easy; doing it without a pop at every seam is the actual job. Where two files meet, their waveforms almost never line up, and that step is audible as a click. This joiner treats every seam: an equal-power crossfade blends the tail of one track into the head of the next with the level held flat through the join, a silent gap gives each track its own space with short anti-click fades on either side, and even a plain butt join gets a 10 ms fade pair so nothing snaps. Files that disagree on sample rate or channel count are conformed first. By default everything is raised to the highest rate present, so no track loses bandwidth to the merge.
How to Use It
- Upload your audio file and wait for the local preview to load.
- Adjust the settings: Add the tracks you want to combine, set a crossfade or a gap for the seams, and choose how sample rates should be matched.
- Download the result: Download the processed file directly to your device.
Controls and Options
Lengthen the crossfade for a musical blend between clips in the same key, or switch to a gap when each track should stand on its own. The sample-rate mode decides whether files are raised to the best rate present or forced to match the first track.
Formats and Output
Reads common audio formats your browser can decode, including MP3, WAV, M4A, OGG, and FLAC, and exports a lossless 16-bit WAV so the join adds no further compression.
Frequently Asked Questions
How are clicks at the joins avoided?
Every seam is treated. With a crossfade, the tail of one track and the head of the next occupy the same samples, weighted by the equal-power cosine law so the level stays flat through the transition. With a gap or a direct join, a 10 ms fade-out and fade-in pair removes the amplitude step that would otherwise be audible as a pop.
What does the equal-power crossfade do differently from a linear one?
A linear crossfade dips about 3 dB at its midpoint on material that is not identical in both files, which is audible as the join briefly getting quieter. The equal-power law weights the two sides by cosine and sine, whose squares always sum to one, so the perceived level holds steady through the blend.
What happens when a gap and a crossfade are both set?
The gap wins. A gap means silence between the tracks, and there is nothing for a crossfade to blend into, so the crossfade is skipped for that seam. Each track edge next to the gap still gets a short anti-click fade so the silence starts and ends cleanly.
Can I join files with different sample rates or channel counts?
Yes. Files are conformed before joining: by default every track is resampled up to the highest rate present, so no track is downsampled, and mono tracks are duplicated to both channels when they meet stereo material. Choosing to match the first file instead can downsample later tracks, and the result view reports when resampling happened.
Why is the output a WAV file?
WAV is lossless, so the joined result carries your tracks exactly as they were decoded, with no second generation of lossy compression added at the seams. You can convert the result to a compressed format afterwards if you need a smaller file.
Is my audio uploaded anywhere?
Supported audio content is not uploaded for processing. Reading, joining, and export run in your browser; site analytics and the assistant are separate.