Audio Metadata Viewer

Find out what’s really inside an audio file: format, codec, bitrate, sample rate, bit depth, channels, every tag and embedded image — plus an optional loudness analysis. Check one file or a whole folder and export the results. Nothing is uploaded.

No upload
Tech details & tags
LUFS & true peak
CSV / JSON export

Drop audio files to inspect

You can also paste with Ctrl+V (⌘+V on Mac) or drop a whole folder.
MP3 · WAV · M4A · AAC · FLAC · OGG · OPUS · MP4 / MOV video

Your files are processed on your device and are never uploaded.

How it works

How to view audio metadata

Instant results, right in your browser.

1
Add files
Drop one or more audio or video files onto the page.
2
Read the details
Technical properties, tags, cover art and raw frames appear for every file instantly.
3
Analyze & export
Optionally measure loudness, then copy the info or export everything as CSV or JSON.

Why ToolCMB

A complete audio inspector

Like MediaInfo — but in your browser.

Technical details

Container, codec, duration to the millisecond, average bitrate and CBR/VBR, sample rate, bit depth, channels.

Every tag

Normalized fields (title, artist, album …) plus all raw ID3 frames, iTunes atoms and Vorbis comments.

Cover art

See embedded images with their size and save them as JPG or PNG.

Loudness

Integrated LUFS, true peak, loudness range, RMS and clipped samples on demand.

Spot fakes

Check whether a “320 kbps” MP3 or a “Hi-Res” FLAC really is what it claims.

Export

Copy a summary, download JSON per file or a CSV of the whole folder.

Private

Files are read locally; nothing is uploaded.

Free

Unlimited files, no sign-up.

Understanding audio file properties

The container (MP3, M4A, FLAC, WAV, OGG …) is the file format; the codec is how the sound is encoded inside it. M4A usually contains AAC, OGG contains Vorbis or Opus, and WAV contains uncompressed PCM.

Bitrate shows how much data is used per second. CBR (constant bitrate) files use the same rate throughout; VBR (variable) files vary it and show an average. Lossless formats like FLAC have a varying bitrate that depends on the music.

Sample rate (e.g. 44.1 kHz) and bit depth (e.g. 16-bit) describe the resolution of uncompressed and lossless audio. A 24-bit / 96 kHz FLAC is “Hi-Res”; an MP3 has no fixed bit depth.

Typical values

Source	Format	Sample rate	Bitrate / depth
Streaming download / MP3 store	MP3	44.1 kHz	256–320 kbps
iTunes / Apple Music	M4A (AAC)	44.1 kHz	256 kbps
CD rip	FLAC / WAV	44.1 kHz	16-bit
Hi-Res store	FLAC	96–192 kHz	24-bit
iPhone voice memo	M4A (AAC)	48 kHz	64 kbps mono
WhatsApp voice note	OGG (Opus)	48 kHz	≈ 16–32 kbps

Tips

Fix wrong or missing tags with the ID3 Tag Editor.
Remove all metadata before sharing with Remove Audio Metadata.
A detailed loudness report with platform targets: the LUFS Calculator.
Need the total length of many files? Use the Audio Duration Calculator.

FAQ

Frequently asked questions

Can’t find your answer? Contact us — we reply quickly.

How can I check the bitrate of an MP3?

Drop the MP3 onto this page. The bitrate (and whether it is CBR or VBR) is shown instantly.

How do I know if a FLAC is really Hi-Res?

Check the sample rate and bit depth: Hi-Res FLAC files have 24-bit and 88.2 kHz or more. Upsampled files keep the numbers but not the extra detail, which a metadata viewer cannot detect.

Can I see the album art?

Yes. Embedded images are shown with type, size and dimensions, and you can save them.

What does the loudness analysis measure?

Integrated loudness in LUFS (ITU-R BS.1770), true peak, loudness range, RMS level, sample peak and the number of clipped samples.

Is my file uploaded?

No. The file is read and analyzed in your browser.

Can I export the results?

Yes — copy a text summary, download JSON for each file or export a CSV with all files.

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