Choose the input
Upload one browser-supported audio file from your device.
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Music Analyzer — Analyze Any Song
Get a technical summary and time-based view of a track: estimated BPM, key, relative energy, dynamics, duration and measurable intensity changes in one browser analysis. No account or software installation is required.
AUDIO STAYS ON YOUR DEVICE
PRIVATE ON-DEVICE ANALYSIS
Your audio stays on this device. Musical details such as BPM, key and style are best estimates, so use your ears for a final check.
Three steps from input to answer
Use the live tool
Let the analyzer measure rhythm, pitch, dynamics, file properties and equal time windows.
Check the result
Review the summary and timeline, then verify candidate peaks, transitions or cue points by listening.
THE BASICS
What is a music analyzer?
A music analyzer combines several focused measurements rather than answering only one question. It profiles rhythm, harmony, dynamics and file properties, then adds a section-by-section energy timeline without pretending that signal changes are semantic verse or chorus labels.
This page gives you a dedicated workspace for music analyzer, followed by practical guidance for checking and using the result. If you need a different workflow, the related tools below make it easy to continue without starting over.
HOW IT WORKS
How does a music analyzer work?
The tool reads the recording once and uses the same decoded audio for several measurements. Rhythmic patterns suggest BPM, pitch content suggests key and signal strength contributes to relative energy. Equal time windows expose changing intensity, while duration, sample rate and channel count describe the source the browser opened.
The tool reads the selected audio on your device and creates one report from several measurements. Repeating rhythmic events suggest BPM, pitch patterns suggest key, and signal levels show peak, average strength and dynamic range. Energy, brightness and stereo width are relative descriptions that are most useful when you compare files in the same tool.
Automatic audio results can vary with the recording. Music Tools Lab labels estimates and relative measurements clearly, exposes uncertain states where supported and recommends a listening check whenever the exact interpretation matters.
Where this tool helps
A single summary is useful when cleaning a music library, preparing a DJ crate, comparing reference tracks, planning playlist order or checking whether a file matches the technical expectations of an editing project.
Audit a music library
Collect comparable tempo, key, level and file-property observations for unfamiliar tracks.
Compare references
Inspect measurable differences between a working mix and selected reference files.
Prepare a DJ crate
Combine rhythm, likely key and relative energy before listening through transitions.
Check decoded files
Confirm duration and channel layout, and note the browser working rate before an editing workflow.
BETTER RESULTS
How to get a useful result
Duration, channels, sample rate and levels describe the audio your browser opened. BPM and key are estimates and can be uncertain. Energy, brightness and stereo width are comparison values rather than universal mastering grades, so a remaster, edit or different source file may produce a different profile.
Start with representative material: Upload one browser-supported audio file from your device. Keep the original source available, note which section you checked and repeat the measurement when the arrangement, tempo or harmony changes.
When the estimate looks wrong
- Compare the exact same file versions; remasters and edits are different measurements.
- Do not treat dBFS RMS as LUFS or the energy index as a streaming normalization value.
- Open the dedicated BPM or key page when an estimated feature needs focused verification.
USEFUL CONTEXT
RMS, peak and crest factor answer different questions
Peak reports the largest decoded sample, while RMS summarizes average signal power across the analyzed audio. Crest factor is the difference between peak and RMS: a larger gap often indicates stronger transient contrast, while a smaller gap can accompany dense or limited material. None of these numbers alone proves perceived loudness or mastering quality because frequency balance and time weighting also matter.
QUALITY CHECK
Build a result you can verify
Choose material that represents the part of the song you actually plan to use. A clean section with a stable arrangement usually gives rhythm and harmony analysis more evidence than a spoken introduction, long fade or noisy crowd recording. Keep the original file available, note which section you checked and repeat the analysis if the song changes significantly between sections.
Treat the displayed value as the start of a listening check. Follow the beat for several bars, try the suggested key against an instrument when harmony matters and compare broad energy or style labels with what you hear. Writing down the source, section and result makes later comparisons meaningful instead of relying on two measurements made under different conditions.
EXAMPLE
How to read the result in practice
A result might read 128 BPM, A minor, 84% relative energy and 3:42 duration, then show a quieter opening and a measured peak near 2:10. Those timestamps can suggest edit or cue candidates, but listening decides whether they are musically meaningful.
What to keep in mind
Duration and format properties are direct readings; BPM, key and energy are estimates. Energy is not simply volume, and timeline boundaries are not semantic song sections. Compare scores within this tool and verify important findings by ear.
If the first estimate conflicts with what you hear, repeat the check with another representative passage and compare it with a manual or instrument-based method where possible.
Learn more about this tool
These technical references provide extra background on the browser features, audio formats or music concepts used on this page.
REFERENCE
MDN: decodeAudioData()
Read the original reference for more detail.
View reference ↗REFERENCEW3C Web Audio API
Read the original reference for more detail.
View reference ↗Your audio stays private
Selected files are processed in your browser and are not uploaded to Music Tools Lab. Keep this tab open while the tool is working. Read about privacy & accuracy.
Frequently asked questions
What does the Music Analyzer measure?+
It estimates BPM, musical key and relative energy; reports duration, channels and level information; and charts measured intensity across equal time windows.
Is energy the same as volume?+
No. Volume is a playback control, while relative energy describes the measured intensity of the decoded signal and can be influenced by density, dynamics and tempo.
Can it identify verses and choruses?+
No. It shows measurable intensity changes and candidate transition regions, not invented semantic labels. Confirm all structure by listening.
Are the results objective?+
Duration and basic file properties are direct measurements. BPM, key, energy and style are algorithmic estimates and should be checked against listening context.
Can I compare two songs?+
Analyze each file with the same browser and tool. The relative scores can help comparison, but they do not replace loudness-normalized listening.