Stack Exchange uses imgur for uploading and hosting the images. Stack Exchange imgur's API does respect/recognize the EXIF data and auto-rotates the image to their correct orientation during the upload.
As per the the Metapicz (popular EXIF/meta data viewer tool for images) EXIF data analysis report you will see: (I used the original image URL:
Orientation: Rotate 90 CW
Please pay attention to the preview image shown on the report page. Now, when you upload the image using SE's imgur interface, it extracts the Orientation attribute's value i.e. Rotate 90 CW from the EXIF data and rotates the image accordingly. You can see how the uploaded image looks like in rene's answer.
On the side note, I would also like to point out that imgur will strip the EXIF data once the image is uploaded to their server. You can see the Metapicz report on the above uploaded image (
Why does imgur strips the EXIF data?
Here is a reply from imgur userecho question Where is the EXIF data? :
This is one of the features of the service. exif data is removed
because the images are shared publicly and the developer does not want
hidden information to leak accidentally by users who might have no
idea what exif information is stored in the photos. I do not think
there is any setting available on imgur platform that retains the data
if you so desire.
Here is reply from Alan Schaaf (Founder of imgur):
Sorry, but exif data is striped on purpose to keep the anonymity of
the uploader. This will not change.