Twitter Large JPEG Image
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What is a JPG_LARGE file?
When you open a Twitter-hosted image in a new Chrome tab, the URL may look something like this:
If you download the image from the URL above, Chrome may save it with a JPG_LARGE file extension.
Despite using a different extension, JPG_LARGE files are normal JPEG files. Twitter appends the large attribute to the image URL, causing it to end with .jpg:large. When downloading the image, Chrome changes the colon to an underscore since filenames cannot contain colons. The result is a .jpg_large file.
Twitter may also create other image sizes with the corresponding extensions:
NOTE: Twitter now uses the following URL structure to prevent the creation of JPG_LARGE files: https://pbs.twimg.com/media/FIQbAtSX0AQ4Z7v?format=jpg&name=large