Merge Audio Files
Runs in your browser — your files are never uploaded.
Join audio files end to end into a single MP3 — chapters of a recording, a set of voice notes, tracks into one continuous file. Every input is resampled to a common rate before being joined, which matters more than it sounds: joining a 44.1 kHz file to a 48 kHz one without that step produces a file where everything after the first track plays at the wrong speed, with no error at any point.
OptionsBitrate: Default — best quality for size
How to use Merge Audio
- 1
Choose two or more audio files — they are joined in the order you pick them.
- 2
Set the output bitrate if you need a particular size.
- 3
Click “Convert” to save the joined MP3.
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Frequently asked questions
Can I join files of different formats?+
Yes. MP3, WAV, M4A, FLAC, OGG and AAC can be mixed freely — everything is decoded, brought to a common sample rate and channel layout, and re-encoded as one MP3.
Why does joining need to re-encode?+
Because the fast method — copying the compressed streams straight through — requires every file to share a codec, sample rate and channel count. Files people actually want joined rarely do, and the failure mode is silent: the second file onward plays at the wrong pitch and speed. Re-encoding avoids that entirely.
Is there a gap between the files?+
No silence is inserted. Note that MP3 encoding adds a small amount of padding at the start of each source file, so a join between two MP3s can have an almost imperceptible gap — joining from lossless sources avoids it.
How many files can I join?+
Up to twelve at a time. All of them are decoded together, so the memory cost grows with the count.