Is it possible to tell the quality level of a JPEG?

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You can view compress level using the identify tool in ImageMagick. Download and installation instructions can be found at the official website.

After you install it, run the following command from the command line:

identify -format '%Q' yourimage.jpg

This will return a value from 0 (low quality, small filesize) to 100 (high quality, large filesize).

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