Photo Alt Tagger is a free Chrome extension developed by photoalttagger. This extension aims to assist users in searching for their Google photos and adding alt tags to their Twitter posts. It is part of a research study conducted by the Computational HCI Lab at the University of Michigan.

The extension allows users to easily find their Google photos and add alternative text descriptions, known as alt tags, to their Twitter posts. Alt tags are important for accessibility purposes, as they provide a text description of an image for visually impaired individuals using screen readers. By adding alt tags to their Twitter posts, users can ensure that everyone can understand the content of their images.

It is worth noting that participation in the research study is voluntary and requires users to meet certain criteria. Participants must be aged 18 and above, have an active Twitter account with at least one post in the past 6 months, and have photos stored on Google Photos. For more information on the research study, users can send an email to