Hum Detective — Audio Forensics
Reads the invisible 50/60 Hz mains hum baked into any recording to reveal which power-grid region it was made in — and flags spliced edits. Forensics in your browser.
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Drop an audio or video file
Tap to browse, or drag a recording here. We listen for the faint mains hum baked in by the electrical grid to fingerprint where & how it was recorded.
MP3 · WAV · M4A · OGG · MP4 · MOV · WEBM — analysed entirely on your device
What is mains hum & ENF?
Any device plugged into (or near) the power grid leaks a faint tone at the grid's Electrical Network Frequency — 50 Hz across Europe, most of Asia, Africa & Australia, or 60 Hz across the Americas and parts of Asia. This hum is silently captured by microphones and cameras. By measuring which band dominates we can guess the recording region; and because the grid's exact frequency drifts moment-to-moment, a clean recording's ENF trace is smooth — sudden jumps can betray a cut or splice.
Verdict
50 Hz
Europe · Asia · Africa · Australia
60 Hz
Americas · parts of Asia
Mean ENF
Drift (±)
SNR
Splice flags
Flagged moments
A sharp step in the otherwise-smooth ENF trace can indicate the audio was cut and rejoined, or two clips were stitched together. It is indicative, not proof — gaps in the hum, silence, or strong noise can cause false flags.
100% on-device — your file never leaves the browser. ENF forensics is probabilistic: results are best treated as a clue for investigation, not courtroom evidence.
Why you’ll love Hum Detective — Audio Forensics
Instant & free
No signup, no paywall, no limits — Hum Detective — Audio Forensics works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Instant sound
Plays in real time in your browser via the Web Audio API — headphones recommended.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
Frequently asked questions
Hum Detective — Audio Forensics is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Browsers require a single tap before playing audio. After that first tap, everything works instantly.
Completely. Hum Detective — Audio Forensics runs entirely in your browser (client-side). Nothing you type, upload or generate is sent to our servers, so your data never leaves your device.
No. It works instantly in any modern web browser — Chrome, Safari, Edge or Firefox — on desktop and mobile. You can even install this site as an app.
Yes. The tool is fully responsive and touch-friendly, so it works great on phones and tablets as well as computers.
Workaholic Developers — a software & AI studio. We built Hum Detective — Audio Forensics (and 200+ other free tools) to show what we can do. Need something custom built? We’d love to help.
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