Inspect a local audio file’s format, decoded stream properties, signal levels, and waveform.
Runs locally in your browser
All decoding and signal analysis stays in this tab.
Complete tool guide
Look inside an audio file before you edit, publish, or send it. The inspector shows the file name, type, and size, then decodes the audio to report duration, sample rate, channel count, peak level, and RMS level in dBFS, along with a waveform overview. Everything is analyzed locally in this tab.
Your input is processed in the current browser tab and is not sent to the application server.
Choose an audio file that your browser can play.
Read the file details: name, MIME type, and size.
Review the decoded properties: duration, sample rate, and channels.
Compare peak and RMS levels and look at the waveform for flat tops, silence, or sudden spikes.
The largest absolute sample value, shown as a percentage of full scale and in dBFS. 0 dBFS is the maximum a digital file can store; −1 dBFS or lower leaves some safety headroom.
Root mean square across all channels, which reflects average signal energy. Spoken word often sits roughly between −24 and −16 dBFS RMS, and mastered music is usually higher.
The sample rate is the number of samples per second per channel, such as 44,100 Hz for music or 48,000 Hz for video. Channels are 1 for mono or 2 for stereo.
An overview of amplitude across the whole file. Flat tops pressed against the edges suggest clipping; long flat lines in the middle are silence.
Start with: sine-1000hz-10.0s.wav from the Tone Generator at 50% volume
Duration: 10.0 s · Sample rate: 44,100 Hz · Channels: 1
Peak level: 50.00% (-6.0 dBFS)
RMS level: 35.36% (-9.0 dBFS)For a sine wave, RMS is the peak divided by √2, which is 3 dB lower. Your browser may report a different sample rate if it resamples while decoding.
Start with: A voice recording made with the microphone gain set too high
Peak level: 100.00% (0.0 dBFS)
Waveform: loud sections flattened against the top and bottom edgesClipping cannot be undone by lowering the volume afterwards. Reduce the input gain and record again, aiming for peaks around −6 dBFS.
Duration, sample rate, channels, and levels come from the audio as decoded by your browser. Some browsers resample to the device’s rate while decoding, so a 44.1 kHz file can be reported at 48 kHz.
RMS measures signal energy but does not model human hearing. Streaming platforms use loudness in LUFS (EBU R 128 / ITU-R BS.1770), which weights frequencies and ignores silence. Use RMS for quick comparisons only.
The inspector uses your browser’s built-in decoder, so MP3, WAV, M4A/AAC, OGG, and WebM work in most browsers, and FLAC in most. Files up to 128 MB and 30 minutes of decoded audio can be analyzed.
Choose the file and read the Sample rate value. Note that some browsers report the rate after resampling to your device’s output rate.
Decibels relative to full scale. 0 dBFS is the loudest level a digital file can represent, and all other levels are negative. Every −6 dB roughly halves the amplitude.
Mastered music is often limited to just below full scale, so short peaks can touch 0 dBFS without audible distortion. Look at the waveform: sustained flat tops are the warning sign.
No. It reports the file’s type and size and the properties of the decoded audio. Tag metadata such as artist and album is not read.
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