Free tool
Is that 320 actually 320?
Drop up to 20 files. Find out in seconds. Nothing leaves your computer.
Tune Check tells you, file by file, which of your "320kbps" tracks are what they claim to be and which were upscaled from a smaller copy. It reads each file on your own machine, in your browser. We never see your library.
Drop your tracks here
MP3, FLAC, WAV, AIFF or M4A. Up to 20 files.
What makes a 320kbps MP3 fake?
A real 320kbps file keeps almost all the detail from the original recording. A fake one usually started as a much smaller file, something like 128kbps, where most of that detail was already thrown away to save space. Someone then re-encodes that small file and labels it 320. The file gets bigger and the number in the filename changes, but the detail that was deleted at 128 is gone for good. You can't put back what was never kept.
It's the same as photocopying a blurry photo at a higher resolution setting. The new copy takes up more space on the page. It's still blurry, because the blur was baked in before you copied it. Tune Check listens for that missing detail, the part a genuine 320 encode would still have and a fake one already lost, and tells you which one you're holding.
How does Tune Check verify my files?
We don't upload your files. Not to check them, not to store them, not for any other reason. Tune Check reads each file on your own machine and runs the test right there in your browser. Bangerz Army never sees your library, never sees your file names, and never keeps a copy of anything. Close the tab and there is nothing of yours left on our servers, because it was never sent to them in the first place.
The single exception is the catalogue lookup, and only for a file that came back below 320: we send the track name as text to find you a verified copy. Open your network tab and watch it happen.
How do I read my results?
Real 320
Real 320. This file is what the label says it is.
Not actually 320
Not actually 320. This file was upscaled from a lower-quality copy, so the label lies about what's actually there.
A third answer exists, and you will see it: suspicious. A dull master, a vinyl rip or a deliberately filtered edit can stop early for honest reasons, so when the evidence falls short of proof we say so and show you the numbers and the picture instead of guessing.
What happens if I drop more than 20 files?
One run checks 20 files at a time. That's not us being stingy, it's what keeps this free, instant, and running entirely on your machine instead of queuing on a server somewhere. Got more than 20? Run it again, your library isn't going anywhere. Want to check a few thousand at once? That's what we're building next, as a desktop app.
Frequently asked questions
Is my MP3 really 320kbps?
- A 320kbps label in the file name or tag does not guarantee a real 320kbps encode. Tune Check looks past the tag and reads the actual frequency content of the audio. A genuine 320kbps MP3 carries detail up near 20kHz. A fake one was originally encoded at a lower bitrate and then relabeled, so its frequency content stops well below that, even though the file size and tag say otherwise.
How can I tell if an MP3 is fake or upscaled?
- The tell is a frequency cutoff. When an MP3 is compressed at a low bitrate, the encoder throws away high frequencies to save space. If that file is later converted to 320kbps or renamed, the missing frequencies do not come back. Tune Check reads the file's spectrum and flags a hard cutoff below what real 320kbps should reach, which is the signature of an upscale.
Does Tune Check upload my files?
- No. Tune Check analyses your audio locally in your browser, and your files are never uploaded. The only call it makes outside your browser is a short lookup that sends the track's name as text, and only for a file that comes back below 320kbps, to check it against a reference catalogue. No audio data is included in that call or in any other request Tune Check makes.
What happens if I have more than 20 files to check?
- V1 checks up to 20 files in one pass. If you have more, split them into additional batches of 20 and run each batch through separately.
Does Tune Check work on FLAC files too, or only MP3?
- Yes. Tune Check also checks FLAC, WAV and AIFF files. Since these formats are lossless by design, Tune Check checks for a lossy source hidden inside the lossless wrapper: a file that started out as a low bitrate MP3 and was then converted to FLAC, WAV or AIFF without ever regaining the detail that first compression removed.
Why Bangerz Army built this
Bangerz Army built this instead of a neutral analyzer site because catching fake 320s is not a side feature for us, it's the test we already run on every track before it goes in our catalog. This tool hands DJs that same test, for free, on the files they already own.