Audio Codec Viewer
Identify the container and likely codec of an audio file from its own bytes.
Fill in the form and press “Inspect” to see the result here.
How to use it
- 1Choose a file, or drag it onto the upload area.
- 2Press the button. Your browser decodes the file locally.
- 3Read the results. Nothing was uploaded, so there is nothing to clean up.
About the Audio Codec Viewer
The format is identified from the file signature - the first few bytes - and not from the extension. A file named .mp3 that is really a WAV will be reported as a WAV here.
Browsers expose the container but not the exact codec profile. For the full picture, ffprobe or MediaInfo on your own machine will tell you the encoder, the profile and the exact bitrate mode.
Questions people ask
Is my file uploaded?
No. The file is decoded by your own browser and the result is displayed locally. Nothing leaves your device, there is nothing on a server to delete, and this works with no network connection at all.
Why does a large file fail?
Decoding holds the audio in memory uncompressed - roughly 10 MB for every minute of stereo. Long recordings run out of memory in a browser tab, which is why there is a size limit. The queued FFmpeg tools handle bigger files.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.