Learn how to optimize your website's image SEO and accessibility with alt text. Discover what alt text is, why it's important for SEO, and how to use it correctly.

To check if an image has alt text, try selecting the image with your screen reader on. or manually "Inspect" the image in any browser.

The basic editor Tumblr provides for posting, however, does not include a way to change the alignment of text or images, so to center an image you have to edit the post's HTML code manually.

The alt attribute holds a place for alternate text. This is important for accessibiity, or when slow internet might prevent the image from loading.