If you are new to SEO, you may have heard the term image alt text and wondered what it actually means. When I first started learning about SEO, I also thought alt text was something technical that only web developers needed to worry about. But after understanding it, I realized that image alt text is one of the simplest things you can add to your website, and it can help both your visitors and your SEO.
In this blog, I will explain image alt text in very simple language. We will also discuss whether alt text should be short or long and how to write it correctly.
What Is Image Alt Text?
Image alt text, also called alternative text, is a short description added to an image.
It tells search engines and screen readers what the image is about.
For example, imagine you upload a picture of a person doing yoga in a park.
The alt text could be:
“Woman doing yoga in a park during sunrise.”
This description helps search engines understand the image because search engines cannot see images the same way humans can.
Why Was Alt Text Created?
The main purpose of alt text was not SEO.
It was created to help people who have visual impairments.
Many visually impaired users use screen readers. These tools read the content of a webpage aloud.
When the screen reader reaches an image, it reads the alt text.
Without alt text, users may not understand what the image is showing.
This makes websites more accessible and user-friendly.
Why Is Image Alt Text Important for SEO?
Now let’s talk about SEO.
Search engines like Google are getting smarter, but they still rely on information provided by website owners.
Alt text helps search engines understand the content of an image.
This can improve your website’s visibility in search results.
Benefits of Alt Text for SEO
1. Helps Search Engines Understand Images
Google cannot fully understand every image on its own.
Alt text provides additional information about what the image contains.
This helps search engines categorize and index your images correctly.
2. Can Improve Image Search Rankings
Many people search for images directly on Google Images.
If your images have proper alt text, they have a better chance of appearing in image search results.
This can bring extra visitors to your website.
3. Improves User Experience
Good SEO is not only about search engines.
It is also about helping users.
Alt text improves accessibility and makes your website useful for everyone.
4. Supports Page Relevance
When your image alt text matches the topic of your page, it gives search engines more context about your content.
This can strengthen the overall SEO of the page.
What Happens If You Don’t Use Alt Text?
Nothing terrible will happen immediately.
Your website will still work.
However, you may miss several benefits:
- Search engines may not fully understand your images.
- Your images may not rank well in image search.
- Visually impaired users may have a poor experience.
- You lose an opportunity to improve SEO.
That is why adding alt text is considered a good SEO practice.
Should Alt Text Be Short or Long?
This is one of the most common questions beginners ask.
The Simple Answer
Alt text should usually be short and descriptive.
You do not need to write long paragraphs.
The goal is to explain the image clearly using a few words.
Good Example
Image: A man running on a treadmill.
Alt text:
“Man running on a treadmill in a gym.”
This is simple and clear.
Bad Example
“This is a picture of a man who is exercising in a modern gym while running on a treadmill for fitness and weight loss goals because he wants to stay healthy.”
This is too long.
Most images do not need this much detail.
What Is the Ideal Length for Alt Text?
There is no strict rule, but many SEO experts recommend keeping alt text around:
5 to 15 words
or
Around 125 characters or less
The focus should be on clarity, not word count.
If the image can be described clearly in a short sentence, that is usually the best option.
How to Write Good Alt Text
Here are some simple tips.
Describe the Image Clearly
Write what you actually see.
For example:
“Fresh red apples in a wooden basket.”
Keep It Natural
Write naturally as if you are describing the image to a friend.
Avoid robotic descriptions.
Include Keywords When Relevant
If your page is about skincare and the image shows a skincare routine, you can naturally include relevant keywords.
Example:
“Woman applying natural skincare cream.”
Avoid Keyword Stuffing
Do not repeat keywords again and again.
Bad Example:
“Skincare cream, best skincare cream, natural skincare cream, skincare product.”
This looks spammy and can hurt SEO.
Do Not Start With “Image Of”
You do not need to write:
- Image of a dog
- Picture of a dog
Instead write:
“Golden retriever playing in a garden.”
This is cleaner and more useful.
Examples of Good and Bad Alt Text
Example 1
Image: A person drinking water.
Good Alt Text:
“Man drinking water after workout.”
Bad Alt Text:
“Image of man.”
The bad example does not provide enough information.
Example 2
Image: Healthy salad.
Good Alt Text:
“Fresh vegetable salad with tomatoes and lettuce.”
Bad Alt Text:
“Food.”
The good version gives more useful details.
Example 3
Image: Laptop on office desk.
Good Alt Text:
“Laptop and notebook on office desk.”
Bad Alt Text:
“Office office office laptop office desk.”
This is keyword stuffing.
Does Every Image Need Alt Text?
Most images should have alt text.
However, decorative images may not need detailed descriptions.
For example:
- Background patterns
- Decorative shapes
- Design elements
These images do not provide important information, so detailed alt text is usually unnecessary.
For content-related images, always use alt text.
Common Alt Text Mistakes
Writing Too Much
Long descriptions can be confusing.
Keep it simple.
Using Too Few Words
Single words often fail to describe the image properly.
Keyword Stuffing
Never force keywords into alt text.
Ignoring Alt Text Completely
Many website owners upload images and leave the alt text field empty.
This is a missed SEO opportunity.
How Alt Text Helps Website Visitors
SEO is important, but helping users is even more important.
Imagine someone with a visual impairment visiting your website.
A screen reader may say:
“Woman performing yoga pose outdoors.”
This helps the visitor understand the image.
Without alt text, they may miss important information.
That is why alt text improves accessibility and user experience.
Final Thoughts
Image alt text is a simple description that explains what an image shows. It helps search engines understand your images and helps visually impaired users access your content.
From an SEO perspective, alt text can improve image search visibility, support page relevance, and create a better user experience.
One important thing to remember is that alt text should usually be short, clear, and descriptive. You do not need long paragraphs. In most cases, a simple sentence of 5 to 15 words is enough to describe the image properly.
If you are running a website, adding alt text to your images is one of the easiest SEO improvements you can make. It takes only a few seconds but can provide long-term benefits for both your visitors and your search engine rankings.
