SirenMix SirenMix
No Upload WebAssembly

Audio tools for day-to-day DJ work

Built for quick local audio tasks: change tempo, convert formats, and preview results without uploading files.

Start Using Tools

Tools

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BPM Changer

Auto-detect BPM, change tempo, preserve pitch, preview in real time, and batch export.

BPMPreserve PitchPreview
Open BPM Changer
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Audio Converter

Convert between MP3, WAV, FLAC, and OGG formats. Batch processing supported.

MP3WAVFLACOGG
Open Audio Converter
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Spectrum Analyzer

Draw a full-track spectrogram, read the frequency cutoff, and catch fake 320s and fake lossless before a gig.

SpectrogramMP3FLAC
Open Spectrum Analyzer
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Key Changer

Transpose songs in semitones without touching tempo, with Camelot wheel key mapping built in.

CamelotSemitonesPreview
Open Key Changer

Your files never leave your device — all processing runs in your browser via WebAssembly.