How to Add Alt Text to Images: SEO & Accessibility

Why Alt Text Matters for Your Small Business Website

Alt text—short for alternative text—is a brief description of an image that serves two critical purposes: it helps people with visual impairments understand what's in your images through screen readers, and it signals to search engines what your images are about. For small businesses, this seemingly small detail can have outsized impact on both your accessibility and SEO performance.

When you neglect alt text, you're essentially telling search engines and screen reader users that your images don't exist. Google can't "see" images the way humans do; it relies on contextual clues, including alt text, to understand image content. This means images without proper alt text miss out on ranking potential, and users relying on assistive technology get a degraded experience on your site.

Beyond SEO benefits, adding descriptive alt text demonstrates that your business cares about inclusivity. The Americans with Disabilities Act (ADA) compliance is increasingly important, and proper alt text is a fundamental component of web accessibility standards (WCAG guidelines). This protects your business legally while expanding your potential customer base.

Understanding Alt Text vs. Image Titles and Captions

Many small business owners confuse alt text with image titles or captions—they're different. Alt text is hidden code that describes the image for screen readers and search engines. Image titles are hover-over tooltips (less important for SEO). Captions are visible text beneath images that provide context for sighted users.

Each serves a purpose: alt text is functional and SEO-focused, titles offer micro-interactions, and captions provide visible context. For maximum SEO benefit, you should optimize all three, but alt text is non-negotiable. Think of alt text as your image's resume—it tells search engines exactly what your image shows and why it matters to your content.

The distinction matters because search engines and assistive technologies specifically look for alt attributes in your HTML code. When writing alt text, you're communicating directly with these systems, not with your human visitors.

Step-by-Step Guide to Writing Effective Alt Text

1. Be Descriptive but Concise Write 125 characters or fewer. Describe what's in the image, not what it looks like. Instead of "pretty blue background," try "digital marketing team collaborating on laptop in modern office."

2. Include Relevant Keywords Naturally If you're writing about "best web design practices for e-commerce," and your image shows an e-commerce homepage, include those terms: "clean e-commerce homepage design with product grid and shopping cart." Don't keyword stuff—it hurts readability and SEO.

3. Avoid Redundancy Don't start with "image of" or "picture of." Screen readers already announce images as such. Skip it and get straight to description.

4. Context is King The same photograph needs different alt text depending on where it appears. A photo of a person in your "About Us" section needs identification; the same photo in a blog about professional networking needs different context.

5. For Decorative Images, Keep It Minimal If an image is purely decorative and doesn't add informational value, use empty alt text (alt=""). This tells assistive technologies to skip it, which is better than forcing users to hear irrelevant descriptions.

How to Add Alt Text Across Common Platforms

WordPress: In the Media Library, click an image and find the "Alt Text" field. Paste your description there.

Shopify: Upload products and fill the "Alt text" field in image settings. Especially crucial for e-commerce SEO.

Wix: Right-click images, select "Edit," and fill the alt text field.

HTML: Use the alt attribute directly: <img src="image.jpg" alt="your descriptive text here">

Audit your existing images monthly. Most small business websites have hundreds of images with missing or poor alt text—this is low-hanging SEO fruit waiting to be optimized. With consistent attention to alt text, you'll improve both user experience and search visibility over time.