Merge Audio
Combine audio files.
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What joining audio files involves
Merging audio is concatenation: playing one file's samples after another's in a single output. It works cleanly only when the files agree on their fundamentals — sample rate, channel count, and bit depth. Join a 44.1 kHz mono recording to a 48 kHz stereo one without conversion and the result plays at the wrong speed or drops a channel, which is why a merge tool resamples everything to a common format first.
Then there are the joins themselves. Two clips butted together with different background noise floors produce an audible jump at the seam. A short crossfade — even fifty milliseconds — blends one into the next and hides the transition. Level differences between recordings made on different days are the other giveaway, and normalising each clip before merging is usually more effective than adjusting afterwards.
Why we built this tool
Podcasters join an intro, the main recording, and an outro. Musicians assemble takes. People combine voice notes into one file, or stitch the parts of an interview that was recorded in several sessions.
That material is unreleased and frequently private. Uploading a full set of raw recordings to a web service to have them glued together is a lot of exposure for a simple operation. Ours decodes each file in your browser, concatenates the samples, and encodes the result locally, so nothing leaves your machine. There is no limit on how many files you combine or how long the result is, beyond your device's own memory.
Tips and common mistakes
- Normalise the clips before merging so levels match across the join.
- Match sample rates and channel counts, or the tool must resample and quality suffers.
- A short crossfade hides differences in room tone between recordings made on different days.
- Listen to every transition in the finished file, not just the first one.
Quick start: using Merge Audio
- Add the audio files you want to combine.
- Put them in the order they should play.
- Check that the clips are at similar volume levels before merging.
- Apply a short crossfade at the joins if the tool offers it.
- Export the merged file and listen to each transition.
Trim the pieces first with Cut Audio, and even out levels using Volume Booster.