How to use Audio Merger
- Add your audio files in the order you want them.
- Check they share sample rate and channel count.
- Merge and listen through the joins.
- Mismatched sample rates or channel counts require resampling, which costs quality.
- Normalise levels before merging or the volume will jump at each join.
- Files are processed in your browser and never uploaded.
Match the files before joining
Clips with different sample rates or channel counts have to be resampled to a common format, which costs quality and occasionally produces artefacts at the joins. Mono and stereo files joined together give inconsistent output. Check that your files match before merging — and if they came from different devices or sessions, they very likely do not.
Level differences are the audible problem
Two recordings made on different days will differ in volume, and the jump between them is obvious to a listener in a way it is not to someone watching a waveform. Normalise the levels before merging, or the result sounds like what it is: separate recordings stuck together. Loudness normalisation to a target LUFS level is the professional approach; matching peaks by eye is the quick one.
Crossfades hide the seam
A hard cut between two clips is audible whenever the room tone differs even slightly. A short crossfade — anywhere from 10 milliseconds to half a second depending on the material — blends the transition so it passes unnoticed. For music the fade usually needs to be longer and placed musically; for speech, short is better, since a long fade on dialogue sounds like a mistake.
Frequently asked questions
Can I mix files with different sample rates?
Is there a limit on how many files I can join?
Are the files uploaded to merge them?
Why does the volume jump between my merged clips?
Do the files need to be the same format?
How do I avoid a click between clips?
How do we know nothing is uploaded? Test it yourself on the privacy proof page.