Your Visitors can easily change the font size of your website from their browser’s zoom In & Out functions but you can make it more handy by adding a + – buttons for changing the font size of your blog post.
Post Size Text Changer is the new WordPress plugin that allows your readers to change the post’s font size. It doesn’t effect your whole website’s size like browser’s zoom button instead it only increases and decreases post’s text size according to reader’s need without refreshing the browser.
Install and activate it. It automatically adds A+ & A- buttons on all of your blog posts as shown in the given screenshots. It also allows you to configure HTML-wrapper (dashboard -> settings ->post size text changer) for changing the style of inserting +- links.