Is this track safe to play out?
Drop an MP3 or WAV. We check quality, level and clipping, then tell you whether it is ready to play, needs a look, or is worth replacing.
Four possible answers
Not a score — an answer about what to do next.
Ready to play
Nothing serious was found.
Check before you use it
Something fixable, like peaks over the ceiling or an unusual level.
Look for the original
Information lost to compression cannot be recovered.
Cannot be analysed
Damaged, or a format this browser cannot read.
What can be fixed, and what cannot
Knowing the difference saves a lot of wasted effort.
Fixable
Level too low or too high · left-right imbalance · DC offset · not enough peak headroom
Not fixable
High frequencies removed by compression · distortion baked into the file · a low-bitrate source re-encoded at a higher bitrate
DeckReady does not rebuild your audio. Its job is to tell you accurately what is going on.
Your audio is never uploaded
Everything runs through your browser's own Web Audio API. We do not transmit the file name or the track title, and there is no login.
Written to be read by beginners
We explain what the numbers mean and what to do next.
Drop the file
Drag in an MP3, WAV, AIFF or similar.
Wait a few seconds
The analysis runs on your own device.
Read the verdict and why
You get what is happening, and whether you can do anything about it.
Common questions
What people ask before they try it.
Is the check free?
Yes. No login, no payment, and no limit on how many tracks you check. It all runs in your browser.
Is my audio uploaded?
No. Everything runs through your browser's own Web Audio API, and no audio data is sent to a server. We do not transmit the file name or the track title either.
What does it actually measure?
Integrated loudness, true peak, clipping, the high-frequency cutoff, stereo phase and balance, and DC offset — and from those it decides whether the file is ready to play. It does not detect BPM or key.
What do I do if it says to get the original?
Information removed by compression does not come back from adjusting the level or re-encoding. The only real fix is to get a higher-bitrate or lossless copy (WAV, FLAC, AIFF) from the store or label.
Which formats work?
MP3, WAV, AIFF, FLAC, M4A, OGG — whatever your browser can decode. Support varies between browsers, and DRM-protected files cannot be analysed.
How accurate is it?
Level and peak are measurements against a published standard. The high-frequency cutoff and the re-encoding estimate are inferences from the audio, and an old recording or a deliberately lo-fi production can read the same way. Every verdict is shown with a confidence level.
Does it work on a phone?
It does, but phone memory is limited, so long tracks and high sample rates may be refused. A desktop browser is more reliable.
Has the mastering tool gone away?
No, it is still there. DeckReady now leads with diagnosis, though — we recommend checking a file first, and only processing it once you know the problem is one that processing can fix.