Hey everyone,
I’ve been building a set of browser-based audio tools aimed at DJs. Everything runs locally in your browser using FFmpeg compiled to WebAssembly — your files never leave your device.
BPM Changer
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Auto-detect BPM, change tempo with pitch preservation
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Preview in real time before exporting
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Useful for prepping edits before importing to your DJ software
Audio Converter
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Convert between MP3, WAV, FLAC, AAC, OGG
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Batch processing supported
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Handy for quick format conversions when you need a compatibility copy for a USB or backup
Both tools are free, no account required to use them:
https://sirenmix.com/tools
I also started writing some practical guides (audio formats comparison, BPM ranges by genre, harmonic mixing reference) if anyone’s interested: https://sirenmix.com/blog
Would love to hear feedback from working DJs — what’s missing, what could be better, or if this is actually useful in your workflow.