See everything about an audio file: duration, format, codec, sample rate, bit depth, channels and bitrate, the embedded tags and cover art, plus measured peak and RMS levels and a waveform overview.
Runs entirely in your browser. Nothing you put in here gets uploaded.
Drop audio files here
or click to browse (MP3, FLAC, WAV, Ogg, Opus, M4A, AAC and more)
Drop several files at once to inspect them one after another.
This tool reads everything an audio file will tell about itself. Drop in an MP3, FLAC, WAV, Ogg, Opus or M4A and it lists the container, codec, duration, sample rate, bit depth, channel layout and bitrate, with a plain verdict on the encoding quality.
It also shows the embedded tags, from title and artist to track numbers and the cover art, which you can save as an image. Below that, the file is decoded and actually measured: peak level and RMS loudness in dBFS, a clipped-sample count and a waveform overview of the whole recording, with a player to listen along.
Peak and RMS come from decoding the file and measuring every sample, not from ReplayGain or loudness tags, so they reflect the audio as it actually decodes. Peak is the loudest single sample and RMS is the average energy over the whole file, both in dBFS where 0 is full scale. Samples at or within a hair of full scale are counted as clipped, per channel and in total.
Lossless files are judged by resolution: 16-bit at 44.1 kHz is CD quality and anything beyond counts as hi-res. Lossy files are tiered by bitrate, since that is the best single predictor of how they sound. The verdict is a rule of thumb, not a listening test.
Measuring levels expands the whole file to raw samples in memory. For very long recordings the tool estimates that cost first and asks before decoding, so a multi-hour recording never freezes the page by surprise. The format details and tags always load right away. For video files, the Video Inspector does the same job for MP4, WebM and MKV.
Open source does the heavy lifting in this tool. Thank you to:
A metadata parser that understands the tags of virtually every audio format.
Everything this site builds on is listed on the credits page.
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