What can screen readers read

So, screen readers. They're basically software that reads digital text out loud, helping people who are blind or have low vision use computers, websites, phones, all that stuff. But here's the thing - they're not just for simple paragraphs. These things can handle all sorts of content and structures, way more than you'd think. If you want to make stuff accessible, you gotta understand what they can actually do.

Can screen readers read images and graphics?

Nope, screen readers can't "see" an image. Not at all. What they can do is read text that's linked to the image. That's where alt text comes in - alternative text. When a developer puts a descriptive alt attribute in the HTML, the screen reader tells the user what's there. Without it? You get nothing useful. Maybe just the file name or "image." Charts and infographics? Those get complicated - usually need a longer description or a separate data table.

Can screen readers read PDFs and documents?

Depends. Completely depends on how the document's built. "Tagged PDF" is what you want - it's got hidden labels that tell the reader what order to read, where headings are, lists, tables. Without that? Untagged PDFs are a mess. Just a jumbled stream of text. Impossible to navigate. Screen readers can handle Word docs, Excel files, PowerPoint presentations too - but only if you've used proper heading styles, table headers, alt text on images. Oh, and scanned PDFs? The ones that are just pictures of text? Useless unless you run OCR first.

Can screen readers read buttons, menus, and forms?

Absolutely. That's literally what they're designed for. They read button labels, menu items, form fields. For forms, they'll tell you what each field is - "First Name, edit text," stuff like that. They also announce element states: "checked" for checkboxes, "collapsed" for dropdown menus. If you use ARIA labels, you can make custom UI components readable too. But everything needs to be coded right - semantic HTML or accessible scripting.

What types of text content can screen readers process?

Screen readers are basically text interpreters. They can read pretty much any digital text out there:

• Headings and paragraphs: They'll say "Heading Level 2" and then read the text.
• Lists: They announce what kind of list it is (bulleted or numbered) and how many items.
• Tables: They can move between cells and read headers, but only if you've used proper tags.
• Links: They read the link text and usually say "link" after it. Users can even get a list of all links on a page.
• Emphasis: Some screen readers change their tone or speed for bold or italic text, but it depends on settings.

Data table: Common content types and screen reader support

Can screen readers read dynamic content and single-page applications?

Modern screen readers can handle dynamic content, but you've got to be careful. When stuff updates without a full page reload - like in SPAs - the screen reader might not announce the change automatically. Developers need to use ARIA live regions (aria-live="polite") to let the reader know something changed. Without that? Users miss out on error messages, new search results, all sorts of thing. Screen readers can handle tooltips, pop-ups, modal dialogs too, as long as the focus and labels are right.

Checklist for ensuring your content is readable by screen readers

• Put descriptive alt text on all meaningful images.
• Use heading tags (

  to

  ) in a logical order.

• Make sure every form input has a proper element.
• Mark up data tables with tags and scope attributes.
• Use semantic HTML (
• Create tagged PDFs with a clear reading order.
• Add captions or transcripts for all video content.
• Use ARIA live regions for dynamic content updates.
• Test everything with a real screen reader - NVDA, JAWS, VoiceOver.
• Don't use images of text. Just use actual text.