Audio Duration and Bitrate Analyzer
100% PrivateFile & Data ConversionInspect an audio file to see how long it runs and its estimated bitrate and format.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
- 1Choose an audio file your browser can play (MP3, M4A, WAV, OGG and similar).
- 2The browser loads the file's metadata locally and measures its duration.
- 3Read the report: duration, estimated bitrate, format, size, channels and sample rate.
A file of 4,200,000 bytes that plays for 210 seconds (shown as 3:30) reports an estimated average bitrate of about 160 kbps: 4,200,000 bytes times 8 bits, divided by 210 seconds. Its format label reads "MP3 · audio/mpeg", from the extension and the type the file reports.
- The bitrate is an estimate, clearly labeled as such: it divides the whole file, container and tags included, by the duration, so it sits slightly above the audio stream's true bitrate and averages out any variable-bitrate changes.
- Only formats your browser can play can be measured, because the duration comes from the browser's own audio engine. An unplayable format cannot be timed here.
- Channel and sample rate come from fully decoding the file with Web Audio; if decoding fails in your browser, those two fields say "Not readable" rather than guessing.
No. The file is loaded into your browser's audio engine on this device and measured there.
About this tool
The Audio Duration and Bitrate Analyzer inspects an audio file and reports how long it runs, its estimated average bitrate, its format, size, and, where the browser can decode it, its channel count and sample rate. Useful before uploading to a platform with limits, or when cataloguing recordings.
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Part of Ovatly's free tools in File & Data Conversion.