Analyze audio · Local tool

Playlist Analyzer

Batch-analyze multiple tracks for estimated BPM, key, and loudness — all in the browser.

Drop several files or browse

MP3, WAV, FLAC, M4A, OGG — analyzed locally in your browser

About this tool

What it does

Playlist Analyzer runs the same local estimators used on single tracks — tempo, key, and simple level metrics — across every file you select. Use it to sketch a set, balance loudness, or sort demos before a session.

Figures are estimates. Treat them as a guide for organization, then confirm critical transitions by ear.

No playlist is uploaded to a server; files stay in memory for the session.

Why analyze a whole set at once

Building a DJ set, a workout mix, or a demo reel usually means juggling tempo and key compatibility across many files at the same time. Running each track through the single-file detectors one by one is slow; the Playlist Analyzer applies the same estimators to every file in one pass and lines the results up in a table so tempo jumps and key clashes are easy to spot at a glance.

Reading the table

Look for tracks with very different BPM values that sit next to each other in your planned order, and for level outliers that will sound noticeably louder or quieter than the rest of the set. Neither issue is fatal — beatmatching software and a normalizer pass can smooth both — but knowing about them ahead of time saves surprises during playback.

Workflow

How to use it

01

Select multiple files

Choose the tracks you want to compare. Large batches may take longer on slower devices.

02

Run analysis

Each file is decoded and measured for BPM, key, and approximate level.

03

Review the table

Scan results to spot tempo islands, key clashes, or quiet outliers.

04

Export notes

Copy values into your own notes or DJ software as a starting grid.

Tip: Sort your planned set by estimated key or BPM after analyzing, then reorder tracks manually where a smoother tempo or harmonic transition would work better.

FAQ

Questions about Playlist Analyzer

01How many files can I analyze?+

There is no hard limit, but browser memory and CPU are practical limits. A few dozen moderate files is typical.

02Are results as good as dedicated DJ tools?+

They use the same class of local estimators as our single-file tools — useful drafts, not lab-grade metering.

03Does order matter?+

Analysis is per file. Order in the list follows your selection order.

04Is anything uploaded?+

No.

05Can I re-analyze after removing a file?+

Yes. Choose a new set of files and run analysis again; the table refreshes for the current selection.

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