Why a script/link? Most people and especially newcomers don't know that we have a bot for this. They often use lossy Windows JPEG rotation which results in wrong EXIF tags and a loss of quality. Note that even “lossless” jpegtran rotation can be slightly lossy (depends on the image's dimensions; at maximum 16 pixels are cropped at borders) but no new compression artifacts are created.

The pop-up will display a thumbnail which should be used to orient the image correctly. It is cared for that this thumbnail is a freshly produced one by automatically purging the file and by using an unusual image size. The purge may have the effect that (in case of wrong EXIF orientation) suddenly all thumbnail sizes will show up wrong if before only some were wrong.

The gadget is enabled by default for all logged-in users but can be easily disabled in the user's settings by one click (remove the checkmark ☑ in front of “RotateLink”) if someone does not like it.

If you uploaded files recently and don't like to wait until the server is purged (is not needed for uploads after 5 October 2011), thus speeding up the dialog, add

Some pre-existing code/icons are used. We thank their authors for creating and sharing!