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Audio File Inspector
Reports an audio file's sample rate, channels, length, per-channel peak and RMS, and whether it has been clipped.
Video & Audio
Nothing uploaded
No sign-up
Free, unlimited
Drop an audio fileread in this page — nothing is uploaded
Add a file to begin.
In short
Bit depth only exists for uncompressed audio. An MP3 or AAC stores frequency coefficients rather than samples, so asking for its bit depth is a category error — the browser decodes it to 32-bit float whatever it was, and any tool reporting "16-bit" for an MP3 is reporting its own decoder rather than the file. Real bit depth can be read from a WAV header, which is what this tool does when the file is a WAV. The other reading worth having is how many samples sit at full scale: any at all means the file has been clipped, the tops of the waveform flattened, and that cannot be undone afterwards.
How to use the Audio File Inspector
- Drop the audio file in.
- Check the full-scale column for clipping.
- Compare the channels — identical ones mean a mono file in a stereo container.
About the Audio File Inspector
The Audio File Inspector reports an audio file's sample rate, channels, length, per-channel peak and RMS, and whether it has been clipped. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Checking a file's sample rate before importing it.
- Finding out whether a recording is clipped.
- Confirming a "stereo" file really has two different channels.
Details
| Sample rate and channels | From the decoder |
|---|---|
| Bit depth | From the WAV header — compressed formats have none |
| Per channel | Peak, RMS and count of full-scale samples |
| Clipping | Any sample at full scale is a warning |
The per-channel table is the quickest way to spot a mono recording saved as stereo: two channels with identical peak and RMS to the decimal place are almost certainly the same signal twice.
Where this tool stops
Reads what the browser's decoder exposes plus the WAV header when present. Codec, encoder, VBR mode and embedded artwork live in the container and are not read.
Frequently asked questions
Why does it not show the bit depth of my MP3?
Because an MP3 does not have one. Lossy formats store frequency-domain coefficients, not samples, so there is no sample word length to report. Any tool that shows one for an MP3 is telling you about its own decoder — usually 16 or 32 bit — rather than about the file.
What does "samples at full scale" mean?
Samples sitting at the maximum the format can represent. A handful can happen naturally; hundreds or thousands mean the waveform was pushed past the limit and the peaks flattened into a straight line. It is permanent — the information is gone — so it has to be fixed before that point in the chain.
My 44.1 kHz file shows as 48 kHz. Why?
The browser may resample on decode, and it reports its own rate rather than the file's. For a WAV the header figure shown here is the file's true rate; for compressed formats, trust a dedicated tool if the exact rate matters.
Do I need an account to use the Audio File Inspector?
There is no cost and no cap. The Audio File Inspector is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this page?
No. The Audio File Inspector runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
When would I actually need the Audio File Inspector?
Typical uses: checking a file's sample rate before importing it. Finding out whether a recording is clipped. Confirming a "stereo" file really has two different channels. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the Audio File Inspector not the right tool?
Reads what the browser's decoder exposes plus the WAV header when present. Codec, encoder, VBR mode and embedded artwork live in the container and are not read. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Sample rate and channels is From the decoder. Bit depth is From the WAV header — compressed formats have none. Per channel is Peak, RMS and count of full-scale samples. These are printed on the page itself, so you do not have to take them on trust.
How large a file can I use?
There is no limit set by us, because your file is never uploaded — the only ceiling is the memory your own browser will give the tab. Very large files simply take longer to process, and a phone will give up sooner than a desktop.
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