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.
About Hum Detective — Audio Forensics
Every electrical device hums at the frequency of your power grid: 50 Hz in most of Europe, Asia, and Africa, or 60 Hz across the Americas. This background hum gets recorded invisibly into audio—but it's a fingerprint of place and time. Hum Detective performs ENF analysis on any recording to extract this electrical signal, revealing which grid region the audio originated from and whether it's been edited or spliced.
Audio forensics used to mean expensive lab equipment. Hum Detective brings forensic mains hum detection to your browser—no signup, no upload to servers, all analysis runs locally on your device. Submit a recording and get an ENF analysis report that shows grid frequency stability, detects discontinuities that flag spliced sections, and narrows the recording's geographic source.
Whether you're fact-checking a leaked recording, verifying interview authenticity, or investigating whether audio has been tampered with, Hum Detective gives you a concrete forensic tool for detecting audio editing and confirming where a recording was made. Fast, free, and private.
Popular uses
Frequently asked questions
When audio is cut and spliced together, the electrical hum often changes frequency or phase at the edit point—the grid's 50/60 Hz reference shifted between the segments. Hum Detective analyzes the consistency of the hum frequency across the entire recording and flags these discontinuities, revealing where splicing likely occurred.
North America, parts of South America, Japan, and a few other regions use 60 Hz grids; Europe, most of Asia, Africa, and Australia use 50 Hz. If you find a recording that hums at a different frequency than the claimed location, it's a red flag for forgery or mis-sourcing.
Mains hum is nearly universal in recordings from devices plugged into the wall or near power infrastructure. Portable battery-only recordings (outdoor, far from power) may have weak or no hum. The stronger the hum signal in your recording, the more reliable the ENF analysis.
Yes. Hum Detective runs entirely in your browser—your recording never leaves your device, is never uploaded to a server, and is not stored. Analysis happens locally; once you close the tab, there's no trace.
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.
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