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https://mp3tomidi.art/bpm-key-detection/

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1</head><body class="antialiased __variable_dd5b2f"><div hidden=""><!--$?--><template id="B:0"></template><!--/$--></div><header class="sticky top-0 z-50 w-full border-b" style="background-color:var(--surface-white);border-color:var(--border-subtle)"><div class="flex justify-between items-center w-full px-4 lg:px-8 py-4 max-w-[1120px] mx-auto"><a class="flex items-center gap-3.5 transition-all duration-200 hover:opacity-85" href="/"><div class="relative h-12 w-12 lg:h-14 lg:w-14 rounded-xl overflow-hidden shadow-lg ring-1 ring-black/5 flex items-center justify-center" style="background-color:var(--primary-brand)"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-music h-6 w-6 lg:h-7 lg:w-7 text-white" aria-hidden="true"><path d="M9 18V5l12-2v13"></path><circle cx="6" cy="18" r="3"></circle><circle cx="18" cy="16" r="3"></circle></svg></div><div class="flex flex-col leading-tight"><span class="text-lg lg:text-2xl font-bold tracking-tight" style="color:var(--text-primary)">mp3tomidi</span><span class="text-xs lg:text-sm font-semibold tracking-wide uppercase" style="color:var(--primary-brand)">Audio Tools</span></div></a><nav class="hidden md:flex items-center gap-6"><a class="text-sm font-medium transition-colors duration-200" style="color:var(--text-secondary)" href="/">Home</a><a class="text-sm font-medium transition-colors duration-200" style="color:var(--text-secondary)" href="/tools">Tools</a><a class="text-sm font-medium transition-colors duration-200" style="color:var(--text-secondary)" href="/mp3-to-midi">MP3 to MIDI</a><a class="text-sm font-medium transition-colors duration-200" style="color:var(--text-secondary)" href="/midi-to-audio">MIDI to Audio</a><a class="text-sm font-medium transition-colors duration-200" style="color:var(--text-secondary)" href="/#faq">FAQ</a></nav><div class="flex items-center gap-1.5"><div class="relative"><button class="flex items-center justify-center h-9 w-9 rounded-lg transition-colors duration-150" style="color:var(--text-secondary)" title="Language" aria-label="Switch language"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-languages h-4 w-4" aria-hidden="true"><path d="m5 8 6 6"></path><path d="m4 14 6-6 2-3"></path><path d="M2 5h12"></path><path d="M7 2h1"></path><path d="m22 22-5-10-5 10"></path><path d="M14 18h6"></path></svg></button></div><button class="px-5 py-2.5 rounded-lg text-sm font-semibold transition-colors active:scale-95 duration-150 shadow-sm cursor-pointer" style="background-color:var(--primary-container);color:var(--primary-foreground)">Sign In</button></div></div></header>
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1<main class="min-h-screen bg-page-bg text-text-primary antialiased"><div class="bg-surface-white border-b border-border-subtle"><div class="max-w-[1120px] mx-auto px-4 lg:px-8 py-3"><nav aria-label="Breadcrumb" class="flex items-center gap-1.5 text-xs text-text-secondary"><a class="hover:text-primary-brand transition-colors" href="/">Home</a><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-3 h-3" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg><a class="hover:text-primary-brand transition-colors" href="/">Tools</a><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-3 h-3" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg><span class="text-text-primary font-medium">BPM &amp; Key Detection</span></nav></div></div><section class="bg-page-bg pt-12 pb-8 lg:pt-20 lg:pb-12"><div class="max-w-[1120px] mx-auto px-4 lg:px-8 text-center"><div class="inline-flex items-center gap-2 bg-status-info-bg text-primary-brand px-4 py-1.5 rounded-full text-xs font-semibold uppercase tracking-[0.05em] mb-6"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-activity w-3.5 h-3.5" aria-hidden="true"><path d="M22 12h-2.48a2 2 0 0 0-1.93 1.46l-2.35 8.36a.25.25 0 0 1-.48 0L9.24 2.18a.25.25 0 0 0-.48 0l-2.35 8.36A2 2 0 0 1 4.49 12H2"></path></svg>Free Online Tool</div><h1 class="text-3xl sm:text-4xl lg:text-5xl font-bold text-text-primary mb-4 leading-tight">BPM &amp; Key Detection Online Free</h1><p class="text-base lg:text-lg text-text-secondary max-w-2xl mx-auto mb-8 leading-relaxed">Detect the tempo and musical key of any audio file instantly in your browser.</p></div></section><section class="bg-page-bg pb-16 lg:pb-24"><div class="max-w-[720px] mx-auto px-4 lg:px-8"><div class="bg-surface-white rounded-2xl border border-border-subtle p-6 lg:p-8"><div><div class="rounded-xl border-2 border-dashed p-8 text-center cursor-pointer transition-all " style="border-color:var(--border-subtle);background-color:var(--surface-white)"><input type="file" accept=".mp3,.wav,.ogg,.flac,.m4a,.aac,.webm,audio/*" class="hidden"/><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-upload w-10 h-10 mx-auto mb-3" aria-hidden="true" style="color:var(--text-secondary)"><path d="M12 3v12"></path><path d="m17 8-5-5-5 5"></path><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path></svg><p class="text-sm font-medium mb-1" style="color:var(--text-primary)">Drop your audio file here</p><p class="text-xs" style="color:var(--text-secondary)">or click to browse</p><p class="text-xs mt-3" style="color:var(--text-secondary)">Supports MP3, WAV, OGG, FLAC · Max 50MB</p></div></div></div></div></section><section class="bg-surface-white py-16 lg:py-24"><div class="max-w-[1120px] mx-auto px-4 lg:px-8"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary text-center mb-14">How It Works</h2><div class="grid sm:grid-cols-3 gap-8"><div class="text-center"><div class="w-14 h-14 bg-primary-brand text-white rounded-full flex items-center justify-center mx-auto mb-5"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-upload w-6 h-6" aria-hidden="true"><path d="M12 3v12"></path><path d="m17 8-5-5-5 5"></path><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path></svg></div><div class="text-xs font-semibold text-primary-brand uppercase tracking-[0.08em] mb-2">Step <!-- -->1</div><h3 class="text-base font-semibold text-text-primary mb-2">Upload Your Audio</h3><p class="text-sm text-text-secondary leading-relaxed">Drag and drop or browse for any MP3, WAV, OGG, FLAC, M4A, AAC, or WebM file up to 50 MB.</p></div><div class="text-center"><div class="w-14 h-14 bg-primary-brand text-white rounded-full flex items-center justify-center mx-auto mb-5"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-cpu w-6 h-6" aria-hidden="true"><path d="M12 20v2"></path><path d="M12 2v2"></path><path d="M17 20v2"></path><path d="M17 2v2"></path><path d="M2 12h2"></path><path d="M2 17h2"></path><path d="M2 7h2"></path><path d="M20 12h2"></path><path d="M20 17h2"></path><path d="M20 7h2"></path><path d="M7 20v2"></path><path d="M7 2v2"></path><rect x="4" y="4" width="16" height="16" rx="2"></rect><rect x="8" y="8" width="8" height="8" rx="1"></rect></svg></div><div class="text-xs font-semibold text-primary-brand uppercase tracking-[0.08em] mb-2">Step <!-- -->2</div><h3 class="text-base font-semibold text-text-primary mb-2">Automatic Analysis</h3><p class="text-sm text-text-secondary leading-relaxed">Our WebAudio-based algorithms decode the audio and detect tempo and musical key entirely in your browser.</p></div><div class="text-center"><div class="w-14 h-14 bg-primary-brand text-white rounded-full flex items-center justify-center mx-auto mb-5"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chart-column w-6 h-6" aria-hidden="true"><path d="M3 3v16a2 2 0 0 0 2 2h16"></path><path d="M18 17V9"></path><path d="M13 17V5"></path><path d="M8 17v-3"></path></svg></div><div class="text-xs font-semibold text-primary-brand uppercase tracking-[0.08em] mb-2">Step <!-- -->3</div><h3 class="text-base font-semibold text-text-primary mb-2">View Results</h3><p class="text-sm text-text-secondary leading-relaxed">See the detected BPM, musical key, mode, and confidence scores displayed instantly.</p></div></div></div></section><section class="bg-surface-white py-16 lg:py-24"><div class="max-w-[1120px] mx-auto px-4 lg:px-8"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary text-center mb-14">Example Output</h2><div class="max-w-[600px] mx-auto bg-surface-white rounded-2xl border border-border-subtle p-8"><div class="w-full rounded-lg mb-8" style="height:60px;background:linear-gradient(90deg, var(--accent-teal) 0%, var(--primary-brand) 40%, var(--accent-teal) 70%, var(--primary-brand) 100%);opacity:0.3"></div><div class="flex items-baseline justify-between mb-4"><div><span class="text-3xl font-bold text-primary-brand">128</span><span class="ml-3 text-sm text-text-secondary">Beats Per Minute</span></div></div><div class="flex items-baseline justify-between mb-4"><div><span class="text-3xl font-bold text-accent-teal">A Minor</span><span class="ml-3 text-sm text-text-secondary">Musical Key</span></div></div><div class="mb-4"><div class="flex items-baseline justify-between mb-1"><span class="text-sm text-text-secondary">Confidence</span><span class="text-sm font-semibold text-accent-teal">94%</span></div><div class="w-full h-2 bg-page-bg rounded-full overflow-hidden"><div class="h-full bg-accent-teal rounded-full" style="width:94%"></div></div></div><p class="text-xs text-text-secondary text-center">Detected from a 45-second electronic dance track</p></div></div></section><section class="bg-page-bg py-16 lg:py-24"><div class="max-w-[1120px] mx-auto px-4 lg:px-8"><div class="text-center mb-10"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary mb-3">Features</h2><p class="text-text-secondary max-w-xl mx-auto">Everything you need for fast, accurate audio analysis.</p></div><div class="grid sm:grid-cols-2 lg:grid-cols-3 gap-6"><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-lock w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><rect width="18" height="11" x="3" y="11" rx="2" ry="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">100% Private</h3><p class="text-sm text-text-secondary leading-relaxed">All analysis runs locally in your browser. Your audio files are never uploaded to any server.</p></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-zap w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><path d="M4 14a1 1 0 0 1-.78-1.63l9.9-10.2a.5.5 0 0 1 .86.46l-1.92 6.02A1 1 0 0 0 13 10h7a1 1 0 0 1 .78 1.63l-9.9 10.2a.5.5 0 0 1-.86-.46l1.92-6.02A1 1 0 0 0 11 14z"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">Instant Detection</h3><p class="text-sm text-text-secondary leading-relaxed">Get BPM and key results in seconds thanks to optimised WebAudio and FFT-based algorithms.</p></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-file-audio w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><path d="M17.5 22h.5a2 2 0 0 0 2-2V7l-5-5H6a2 2 0 0 0-2 2v3"></path><path d="M14 2v4a2 2 0 0 0 2 2h4"></path><path d="M2 19a2 2 0 1 1 4 0v1a2 2 0 1 1-4 0v-4a6 6 0 0 1 12 0v4a2 2 0 1 1-4 0v-1a2 2 0 1 1 4 0"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">Multiple Formats</h3><p class="text-sm text-text-secondary leading-relaxed">Supports MP3, WAV, OGG, FLAC, M4A, AAC, and WebM — virtually any audio file you have.</p></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-activity w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><path d="M22 12h-2.48a2 2 0 0 0-1.93 1.46l-2.35 8.36a.25.25 0 0 1-.48 0L9.24 2.18a.25.25 0 0 0-.48 0l
1-2.35 8.36A2 2 0 0 1 4.49 12H2"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">Confidence Scores</h3><p class="text-sm text-text-secondary leading-relaxed">Each result comes with a confidence percentage so you know how reliable the detection is.</p></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-globe w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><circle cx="12" cy="12" r="10"></circle><path d="M12 2a14.5 14.5 0 0 0 0 20 14.5 14.5 0 0 0 0-20"></path><path d="M2 12h20"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">Works Everywhere</h3><p class="text-sm text-text-secondary leading-relaxed">Use it on any modern browser — Chrome, Firefox, Safari, Edge — on desktop or mobile.</p></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle hover:shadow-md transition-shadow"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-disc3 lucide-disc-3 w-8 h-8 text-primary-brand mb-4" aria-hidden="true"><circle cx="12" cy="12" r="10"></circle><path d="M6 12c0-1.7.7-3.2 1.8-4.2"></path><circle cx="12" cy="12" r="2"></circle><path d="M18 12c0 1.7-.7 3.2-1.8 4.2"></path></svg><h3 class="text-base font-semibold text-text-primary mb-2">Waveform Visualisation</h3><p class="text-sm text-text-secondary leading-relaxed">See a real-time interactive waveform of your audio with playback controls.</p></div></div></div></section><section class="bg-page-bg py-16 lg:py-24"><div class="max-w-[1120px] mx-auto px-4 lg:px-8"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary text-center mb-14">Trusted by DJs and Producers</h2><div class="grid sm:grid-cols-3 gap-6"><div class="bg-surface-white p-6 rounded-xl border border-border-subtle"><div class="flex gap-0.5 mb-3"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg></div><p class="text-sm text-text-secondary leading-relaxed mb-4">I use this before every gig. Faster than any desktop tool.</p><div><p class="text-sm font-semibold text-text-primary">Sarah M.</p><p class="text-xs text-text-secondary">DJ &amp; Producer, Berlin</p></div></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle"><div class="flex gap-0.5 mb-3"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg></div><p class="text-sm text-text-secondary leading-relaxed mb-4">Accurate BPM detection even on tracks with tempo variations. Impressive for a free tool.</p><div><p class="text-sm font-semibold text-text-primary">Alex K.</p><p class="text-xs text-text-secondary">Remixer, Tokyo</p></div></div><div class="bg-surface-white p-6 rounded-xl border border-border-subtle"><div class="flex gap-0.5 mb-3"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-star w-4 h-4 fill-yellow-400 text-yellow-400" aria-hidden="true"><path d="M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z"></path></svg></div><p class="text-sm text-text-secondary leading-relaxed mb-4">My students love seeing the key detection results in real time during class.</p><div><p class="text-sm font-semibold text-text-primary">Carlos R.</p><p class="text-xs text-text-secondary">Music Teacher, Barcelona</p></div></div></div></div></section><section class="bg-surface-white py-16 lg:py-24"><div class="max-w-[800px] mx-auto px-4 lg:px-8"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary mb-6 text-center">Why Detect BPM &amp; Key?</h2><div class="space-y-4 text-sm lg:text-base text-text-secondary leading-relaxed"><p>Knowing the tempo (BPM) and musical key of a track is fundamental for anyone working with audio. DJs rely on BPM to create seamless beat-matched transitions between songs, while music producers need key information to layer melodies, harmonie
1s, and bass lines that sit perfectly together. Even casual musicians benefit — if you want to jam along with a recording, knowing its key saves you the guesswork.</p><p>Traditionally, detecting BPM and key required expensive desktop software or a trained ear. Our free online tool removes those barriers entirely. Upload any audio file — whether it is an MP3 from your music library, a WAV export from your DAW, or a voice memo you want to pitch-shift — and get accurate results in seconds. Because the analysis runs entirely in your browser using the Web Audio API and fast Fourier transform (FFT) algorithms, your files never leave your device, keeping your music completely private.</p><p>The tool analyses onset density to determine beats per minute and uses chromagram-based pitch-class profiling to identify the musical key and whether the track is in a major or minor mode. Confidence scores accompany every result, giving you a clear indication of how certain the algorithm is. This is especially useful for tracks with complex arrangements, tempo changes, or ambiguous tonal centres.</p><p>Whether you are a DJ building a set list, a producer arranging a remix, a music teacher preparing materials, or a content creator matching background music to a video, accurate BPM and key data lets you work faster and make better creative decisions. Best of all, there is nothing to install and no account required — just drop your file above and start analysing.</p><p>Our BPM finder uses advanced onset-density analysis and autocorrelation to deliver accurate tempo detection results. Whether you call it a BPM detector, tempo finder, or beat counter, the underlying algorithm is the same — optimized for real-world music with varying dynamics. BPM detection is essential for DJs beat-matching tracks, producers setting project tempo, and music students analyzing song structure.</p></div></div></section><section class="bg-page-bg py-16 lg:py-24"><div class="max-w-[800px] mx-auto px-4 lg:px-8"><h2 class="text-2xl lg:text-3xl font-semibold text-text-primary mb-10 text-center">Frequently Asked Questions</h2><div class="space-y-3"><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">What audio formats are supported?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">We support MP3, WAV, OGG, FLAC, M4A, AAC, and WebM files up to 50 MB in size. If your file is in a different format, you can convert it using a free tool like FFmpeg before uploading.</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">How accurate is the BPM detection?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">Our BPM detection uses onset-density analysis and autocorrelation techniques that typically achieve accuracy within 1-2 BPM for steady-tempo tracks. Every result includes a confidence percentage so you can gauge reliability. Tracks with tempo changes or complex rhythms may produce lower confidence scores.</div></details>
1<details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">How does key detection work?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">The algorithm computes a chromagram — a time-frequency representation mapped to the 12 pitch classes — and compares it against major and minor key profiles. The best-matching profile determines the detected key and mode (major or minor).</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">Is my audio file uploaded to a server?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">No. All processing happens locally in your browser using the Web Audio API. Your file is never transmitted over the internet, ensuring complete privacy.</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">Can I detect the BPM and key of a YouTube video?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">You need to have the audio file locally first. Download the audio from the video (where legally permitted), then upload the file to our tool for analysis.</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">What is the minimum and maximum audio length?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">The audio must be at least 1 second and no longer than 10 minutes. For best key-detection accuracy, we recommend at least 15-30 seconds of representative audio.</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">What BPM is typical for hip hop, EDM, and pop music?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">Hip hop: 80-100 BPM, EDM: 120-150 BPM, pop: 100-130 BPM, jazz: 120-180 BPM. These are general ranges — many subgenres and modern tracks break these conventions.</div></details>
1<details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">Can the tool detect tempo changes within a song?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">Our algorithm detects the dominant tempo. For tracks with significant tempo changes (rubato, accelerando), the confidence score will be lower. For best results, analyze sections with consistent tempo.</div></details><details class="group bg-surface-white border border-border-subtle rounded-xl overflow-hidden"><summary class="flex items-center justify-between cursor-pointer px-5 py-4 text-sm font-semibold text-text-primary select-none hover:bg-page-bg transition-colors">Is this a BPM finder or tempo detector?<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-right w-4 h-4 text-text-secondary transition-transform group-open:rotate-90 shrink-0 ml-4" aria-hidden="true"><path d="m9 18 6-6-6-6"></path></svg></summary><div class="px-5 pb-4 text-sm text-text-secondary leading-relaxed">Both. Our tool serves as a BPM finder and tempo detector in one. It analyzes audio onset density to determine beats per minute, functioning as an accurate BPM detector for any genre — from hip hop to classical.</div></details></div></div></section><section class="bg-primary-brand py-16 lg:py-20"><div class="max-w-[1120px] mx-auto px-4 lg:px-8 text-center"><h2 class="text-2xl lg:text-3xl font-semibold text-white mb-4">Need MIDI? 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