Audio Merger
Combine multiple audio files into one continuous track. Supports crossfade between songs and automatic volume normalization. Perfect for making mixtapes, podcasts, and audiobooks. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM.
Runs on FFmpeg
How to Use the Audio Merger
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Frequently Asked Questions
How many audio files can I merge together?
There is no limit. Add as many files as you need — the merger concatenates them in the order you arrange. Each file is processed sequentially from your browser.
What does the crossfade option do?
Crossfade blends the end of one track into the beginning of the next, creating a smooth transition instead of an abrupt cut. Set the duration from 0–10 seconds in 0.5-second steps.
Will the merged file sound louder or quieter?
The Normalize Volume switch runs the finished mix through a loudness normalizer (-16 LUFS) so one steady track comes out. Without it, files recorded at different volumes stay uneven in the output.
Can I merge files of different formats?
Yes. The tool accepts mixed formats — for example, you can merge an MP3 with a WAV and an OGG. All files are converted to a common format before joining.
What format is the output file?
The merged output defaults to MP3 for broad compatibility. You can also choose WAV, FLAC, M4A, or OGG depending on your quality and file size preferences.
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Last updated October 2026