Use the free Audio File Analyzer below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
Before you send that audio file, check it
Most audio problems are discovered at the worst possible moment. You send a podcast episode to an editor, and they reply that one guest is barely audible. You upload a voice-over to a client, and they reply that it clips. You submit a music track to a distributor, and it bounces back for a technical reason you do not understand. An analyzer catches all of that before you send anything. It reads the decoded samples of your file and reports the true numbers: how long it is, how many channels it has, what sample rate it uses, how loud its peak is, how loud it feels on average, and how wide the gap is between those two. Those six numbers tell a professional almost everything they need to know.
You do not need to be a professional to benefit. If you record lectures, interviews or voice notes, a thirty-second check tells you whether the recording is usable or whether you should re-record while the speaker is still in the room. That is the real value of this tool. It turns a vague feeling, this sounds a bit quiet, into a number you can act on, and it does it before the moment to fix it has passed.
Reading the numbers like a sound engineer
Start with duration, channels and sample rate. Duration tells you whether the file is complete or cut short. Channels tell you whether it is mono or stereo, which matters for delivery. Sample rate tells you whether it matches your project: 44100 for music, 48000 for video. Next, peak level. The peak is the single loudest sample, measured in decibels below the digital ceiling. A peak near minus 1 is healthy for a finished file. A peak at minus 30 means the recording is very quiet. A peak at exactly zero across many samples means it clipped, and the distortion is baked in.
Then RMS level, which is the average loudness. Engineers compare peak and RMS to get the crest factor, the gap between the loudest moment and the average. A large crest factor, say 20 decibels, means a dynamic recording: quiet passages and loud peaks, like a classical concert or a natural conversation. A small crest factor, say 6 decibels, means a constantly loud file, like a modern pop track or a heavily compressed podcast. Neither is right or wrong on its own. A bedtime story should have a large crest factor. A radio advert should have a small one. The number just tells you which kind of file you have.
The waveform is worth a thousand numbers
This tool also draws the waveform of your file, which is the shape of the sound over time. Learn to read it and you will spot problems at a glance. A waveform that is flat at the top for long stretches is clipped. A waveform that is tiny in the middle and huge at the ends has an inconsistent speaker, or a microphone that was moved. Long flat stretches of near-silence are pauses, or dead air you could trim. A waveform that suddenly jumps in height halfway through means the recording settings changed mid-session. None of this requires training. It is a picture of loudness over time, and your eyes are already good at pictures.
Per-channel numbers add one more layer. If the left channel peaks much higher than the right, the sound is panned to one side, or one microphone was closer than the other. For speech, the channels should be roughly equal. For music, a difference is normal and often intentional. The analyzer reports each channel separately so you can see that difference instead of guessing from a single combined number.
How to use this analyzer
Upload the file. The analysis appears immediately, with no extra button needed, and the waveform draws underneath. Read the numbers top to bottom, in the order described above. If something looks wrong, press Play file and listen to the matching moment. A number plus a listen is a diagnosis. A number alone is just a number. When you are done, you have not changed the file at all. The analyzer never edits, normalizes or converts anything. It only reports, which makes it safe to run on originals you cannot afford to damage.
Common questions
Are these numbers real or estimated? Real. They are computed from the decoded samples of your file in your browser, not looked up from a database or guessed from the file size. Does the analyzer work on MP3 and OGG too? Yes. Your browser decodes them first, then the same math runs on the decoded samples. Is my file uploaded? No. Decoding and analysis happen on your device, and nothing leaves it.