Audio Metadata Viewer. Check Audio Properties Online
Drop an MP3, WAV, M4A, OGG or FLAC and instantly read its real duration, sample rate, channel layout, size, format and estimated bitrate: decoded on your device, never uploaded, with a waveform and preview player so you can see and hear exactly what you have.
What is the audio metadata viewer?
The Audio Metadata Viewer inspects an audio file and reports its exact decoded duration, sample rate in kHz, channel layout (mono/stereo), file size, MIME type, detected format and estimated bitrate. Because length is measured from decoded samples, even variable-bitrate or mislabelled files show the truth. Reading happens on-device with the Web Audio engine. Nothing is uploaded.
The GigAI Audio Metadata Viewer answers the question you keep needing before you edit, convert or upload a clip: what actually is this file? Instead of guessing from a filename or opening a full audio editor, drop the file and the tool decodes it locally with the browser's native Web Audio engine and reports the exact duration measured from the decoded samples (so a mislabelled or variable-bitrate file still shows the truth), the sample rate in kHz, the channel layout (mono, stereo or more), the on-disk size, the MIME type the OS attached, the format detected from that type and the extension, and an estimated average bitrate computed from file bytes divided by duration. A waveform and a preview player sit alongside the numbers so you can confirm at a glance that the file is what you expect and isn't silent or truncated. This is the fastest way to check why a clip won't fit a platform's requirements, a podcast host wanting a specific sample rate, a game engine that only accepts mono, a form that rejects anything over a size cap: without uploading a private recording to a stranger's server to find out. Everything runs client-side, so there's no upload wait and no privacy tradeoff, and you can copy any value or the whole report to paste into a ticket, a spec sheet or a message. Be honest about the limits of a pure Web Audio probe: the bitrate is an ESTIMATE (average bytes over time, not the container's declared or per-frame value, and meaningless for uncompressed WAV where it simply reflects the raw PCM rate), and container-level tags like ID3 title/artist/album art aren't exposed by the decode API. This tool reports the audio's technical shape, not its embedded text metadata. Close the tab and nothing was ever stored.
- Difficulty:
- Medium
- Typical time:
- ~30s
- Processing:
- 100% browser processing
Last updated
How to use the audio metadata viewer
- 1
Drop your audio
Drag an MP3, WAV, M4A, OGG or FLAC onto the workspace, or click to browse. It's read and decoded entirely on your device. Nothing is uploaded.
- 2
Read the metadata
Instantly see the exact duration, sample rate, channel layout, file size, MIME type, detected format and estimated average bitrate laid out clearly.
- 3
Confirm with the waveform & preview
Glance at the waveform and play the file in the built-in player to make sure it isn't silent or truncated and matches what the numbers say.
- 4
Copy what you need
Copy any single value or the full report as text to drop into a spec, a ticket or a message, then reset and inspect the next file.
What Audio Metadata Viewer includes
Exact decoded duration
The length is measured from the decoded audio samples, not read from a header, so a variable-bitrate or mislabelled file shows its true duration down to the millisecond, not the container's rough guess.
Sample rate & channel layout
See the precise sample rate in kHz and whether the file is mono, stereo or multichannel, the two facts platforms and game engines most often gate on before they'll accept an upload.
Estimated average bitrate
Get a ballpark bitrate computed from file size over duration: useful for spotting a suspiciously low-quality MP3 at a glance. It's labelled clearly as an estimate, never dressed up as a container-reported value.
Format, MIME type & size
Read the detected format, the raw MIME type the OS attached, and the exact file size in a human-friendly and byte-precise form: everything you need to fill in a spec sheet or debug a rejected upload.
Waveform & preview player
A waveform and an in-page player sit next to the numbers so you can confirm the file isn't silent or truncated and actually sounds like what the metadata claims, a sanity check the raw figures can't give you.
Copy any value or the whole report
Copy a single field or the full metadata report as clean text to paste straight into a ticket, a delivery spec or a message. No retyping numbers by hand.
Why use our audio metadata viewer
Know a file before you edit or convert it
Checking sample rate, channels and duration first means you pick the right tool and settings straight away. No re-doing a conversion because the source wasn't what the filename suggested.
Debug a rejected upload in seconds
When a platform bounces a file for being the wrong rate, too many channels or over a size cap, this shows you exactly which property is off so you know precisely what to fix.
No upload wait, no privacy tradeoff
Server-side inspectors make you upload the file first. Here the audio is decoded in your browser and never leaves the device, so it's safe to inspect private, confidential or unreleased recordings.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Podcaster
Check a file meets host requirements
Your host wants a specific sample rate and stereo layout. Confirm the export matches before uploading, instead of finding out after the platform rejects or re-encodes it.
- Game / app developer
Verify an asset is mono at the right rate
An engine only accepts mono clips at a fixed sample rate. Drop each sound effect to confirm the channel count and rate before it goes into the build.
- Content creator
Spot a low-quality source before publishing
An estimated bitrate that's far lower than expected flags a file that was already compressed hard: catch it now rather than after it's baked into your final video.
- Privacy-conscious user
Inspect a sensitive recording locally
A confidential voice note shouldn't be uploaded to a stranger's server just to read its properties. Decode it in your browser so nothing ever leaves the device.
Supported formats
Accepts MP3, WAV, M4A, AAC and OGG, and produces Copy / text report, all processed locally in your browser.
- MP3
- WAV
- M4A
- AAC
- OGG
- FLAC
- Copy / text report
Frequently asked questions
Recommended tools
Audio Trimmer
Trim audio in your browser with a real waveform: drop an MP3, WAV, M4A or OGG, drag a selection to keep exactly the part you want, preview it, then download a lossless WAV or a compact MP3. Sample-accurate and 100% private. Nothing is uploaded.
MP3 Converter
Convert any audio to MP3 in your browser, WAV, M4A, AAC, OGG, FLAC and more to a clean, universally-playable MP3 with a bitrate you choose. Preview the waveform, encode locally with lamejs, then download. Nothing is uploaded.
Audio Normalizer
Normalize audio volume in your browser: lift a too-quiet recording to a clean target level with peak or RMS normalisation, compare the before/after waveform, then download WAV or MP3. Nothing is uploaded.
WAV Converter
Convert any audio to uncompressed WAV in your browser, MP3, M4A, AAC, OGG, FLAC and more to a clean PCM WAV. Choose the sample rate (44.1/48 kHz…), 16- or 24-bit depth and mono/stereo, preview the waveform, then download. Nothing is uploaded.
AAC Converter
Convert any audio to AAC in your browser, WAV, MP3, M4A, OGG, FLAC and more to a compact, high-efficiency.aac file that plays natively on iPhone, Android, YouTube and modern video apps. Preview the waveform, encode locally, then download. Nothing is uploaded.
Audio Compressor
Compress audio and reduce file size in your browser, lower the MP3 bitrate and sample rate to shrink a WAV, MP3, M4A, FLAC or OGG down to a fraction of its size. See the exact before/after weight, preview the waveform, then download. Nothing is uploaded.
Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
It says the file couldn't be decoded.
Your browser can't natively decode that particular format or the file is corrupt. Try it in a Chromium-based browser (which decodes the widest range), or first convert it to WAV or MP3 with the converter tools, then inspect the result.
The bitrate looks wrong or unusually high.
Remember it's an estimate from size ÷ duration. For uncompressed WAV it's naturally very high because the data is raw PCM. For compressed files a variable bitrate will show as an average, which can differ from the peak or the header's nominal value, that's expected.
No title, artist or cover art is shown.
This tool reads technical audio properties, not container text tags. ID3 and Vorbis comment metadata isn't exposed by the browser's decode API, so it isn't displayed here: that's a deliberate limit, not a bug.
Get the most out of it
Inspect a file first when a platform keeps rejecting it, the property that's out of spec (rate, channels or size) is usually obvious at a glance.
Treat the bitrate as an average: a value far below what you expected is a strong sign the source was already compressed hard.
For WAV, ignore the bitrate 'quality' reading. It just reflects the raw PCM data rate, not any lossy compression setting.
Trust the decoded duration over your file browser's number, especially for variable-bitrate MP3s where headers can lie.
Play the preview before trusting the metadata: a file can report a valid duration while actually being silent or truncated.
What's new
Recent updates and improvements to the audio metadata viewer.
Initial release: native Web Audio metadata probe reporting exact decoded duration, sample rate, channel layout, size, MIME type, detected format and an honest estimated average bitrate, with a waveform and preview player.
Added copy-to-clipboard for individual values and a full text report, plus clearer honest labelling distinguishing the estimated bitrate from a container-reported value.
Improved the friendly undecodable-file message, refined format detection from MIME and extension, and added drag-and-drop with reset-and-inspect-again to the workspace.
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Your privacy is built in
Your audio is read and decoded entirely in your browser using the native Web Audio engine. It is never uploaded to any server. Nothing is stored, logged or transmitted, and the file itself is never modified: this is a strictly read-only probe. The waveform and preview are generated on-device with no exotic codec download, so you can safely inspect personal, confidential or unreleased recordings. Close the tab and nothing about the file remains.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the audio metadata viewer?
Free, private and instant. Audio Metadata Viewer runs right in your browser.