What Is Alt Text? Why It Matters for SEO, Accessibility, and Your Website

If you have a website, you probably upload images all the time — photos, graphics, screenshots, product images, blog graphics, and banners. But most small business owners ignore one small field every time they upload an image: alt text.

Alt text may seem like a small detail, but it plays an important role in website SEO, accessibility, user experience, and how search engines understand your website. It’s one of those small things that most people skip, but over time it can make a real difference in how your website performs.

Many websites either leave alt text blank or use it incorrectly, which means they are missing an easy opportunity to improve their website SEO and accessibility at the same time.

So let’s break down what alt text is, what it does, and how to write alt text that actually works.

What Is Alt Text?

Alt text (alternative text) is a short written description of an image on your website. It is used by screen readers for accessibility and by search engines to understand what an image shows and how it relates to the page content.

The easiest way to think about it is this:

Alt Text: Assorted handmade goat milk soap bars in pink, yellow, and green swirl displayed for a natural skincare product line.

Alt text is a replacement for the image.

If the image did not load, the alt text should explain what the image is and why it is on the page. It should give enough information that someone could understand the purpose of the image without seeing it.

Alt text is not:

• a caption

• a place to list keywords

• a file name

• a design description

Alt text is a functional description written in human language. The goal is clarity, not creativity.

What Does Alt Text Do for SEO?

Search engines cannot see images the way people do. Instead, they rely on text to understand images, including image file names, alt text, surrounding page content, and page titles and headings.

Alt text helps search engines understand:

• what the image is

• how the image relates to the page topic

• what your website content is about

• what topics your website consistently cover

This helps strengthen image SEO, page relevance, and overall website SEO. It also helps search engines understand patterns across your website, which is an important part of long-term SEO and website authority.

Alt text also improves accessibility for users who rely on screen readers, which is an important part of modern website design and usability. Accessibility and SEO often overlap more than people realize.

How to Write Alt Text That Actually Works

Most advice online says to “describe the image,” which is a good starting point, but strong alt text usually includes a little more context than just naming what is in the photo.

Good alt text often includes:

• what is in the image

• why the image is on the page

• details that make it specific

• natural language that may include relevant keywords

Think of alt text as explaining the image to someone who cannot see it. You’re not just labeling the image — you’re explaining its purpose.

Example

Bad alt text:

laptop business work marketing

Okay alt text: Person working on a laptop at a desk.

Stronger alt text:

Small business owner working on website content on a laptop at a desk.

The stronger version gives more context and meaning. It tells both search engines and users what the image is and why it might be relevant to the page.

Not All Images Need Alt Text

This is something many people don’t realize. Not every image on your website should have descriptive alt text. Images on websites usually fall into three categories: informative, decorative, and functional.

Understanding the Three Types of Website Images: 1. Informative: Provide additional information and require descriptive alt text, such as charts and infographics 2. Decorative: Serve purely for design without informational value, using empty alt text to be skipped by screen readers 3. Functional: Perform actions, needing alt text that describes their function, like buttons and icons.

The Biggest Alt Text Mistakes (Most Websites Make These)

This is where many websites go wrong. Even professionally built websites often have these issues because alt text is often treated as an afterthought instead of part of website SEO and accessibility.

1. Keyword Stuffing

Alt text should not be a list of keywords.

Bad: website SEO marketing business website SEO content marketing

Better: Person planning website content and SEO strategy on a laptop.

Alt text should read like a sentence, not a keyword list.

2. Being Too Vague

Very short alt text often does not provide enough context.

Too vague: lap top meeting product office

Better: Team meeting around a table discussing website design plans.

3. Writing Alt Text That Is Too Long

Alt text should usually be under 125 characters. Long paragraphs are not helpful for screen readers and often include unnecessary details.

Keep it clear, specific, and concise.

4. Repeating the Same Alt Text on Multiple Images

Each image should have unique alt text that describes that specific image. Repeating alt text across many images reduces SEO value and creates a poor accessibility experience.

5. Describing Decorative Images

Not every image needs alt text. Decorative images should use empty alt text so screen readers skip them instead of reading unnecessary descriptions.

6. Ignoring Images That Contain Text

If an image contains text (like a graphic, flyer, or infographic), the alt text should include the important text shown in the image, because screen readers cannot read text inside images.

7. Forgetting That Alt Text Is Functional, Not Artistic

Alt text is not the place for creative writing or artistic descriptions. The goal is clarity and function, not decoration or design critique.

Why Alt Text Matters for Your Website Over Time

Alt text does more than describe individual images. Over time, it helps search engines understand what your website is about, what your business does, what topics you talk about, and who your content is for.

Alt text is one small part of SEO, but SEO is made up of many small details working together, including:

• page titles

• headings

• meta descriptions

• internal links

• image file names

• alt text

• page structure

• content topics

Websites that perform well in search engines usually don’t rely on one big trick.They get many small things right consistently, and over time that builds clarity, authority, and visibility.

A Simple Alt Text Formula

If you are not sure what to write, use this formula:

This simple structure works for most website images and keeps your alt text clear and useful.

Examples:

• Small business owner writing website content on a laptop.

• Website homepage layout showing navigation menu and service sections.

• Person packaging handmade products at a work table.

• Team reviewing marketing plan on a whiteboard in an office.

Simple, clear, and descriptive is always better than complicated.

Small improvements like this, done consistently, can make a big difference over time for both SEO and accessibility.

Your website does not improve from one big change.

It improves from many small improvements done consistently and strategically.

If this feels like a lot to think about, that’s because website SEO is not just one task — it’s a system. Alt text, page structure, content, keywords, internal links, and meta descriptions all work together to help your website get found and function properly.

Most small business owners don’t struggle because their business isn’t good. They struggle because their website was never structured to be found in the first place.

If you want your website to actually support your business — not just exist online — this is the kind of strategy, structure, and SEO work I help clients with.