SEO Frequently Asked Questions

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Missing Alt Tags

What is an alt tag (alt text)?

Answer: An alt tag, more properly known as alt text or an "alternative text" attribute, is a short textual description of an image in HTML. It is added to the <img> tag via the alt attribute. The primary purpose of alt text is to describe the image to people (or bots) who can't see it. This could be because the user is visually impaired and using a screen reader, or because the image failed to load. For example:

<img src="puppy.jpg" alt="Golden retriever puppy playing with a red ball on grass">

In the above code, the alt text is "Golden retriever puppy playing with a red ball on grass." Alt text provides context in situations where the image itself is not visible. It’s important for accessibility (visually impaired users rely on it) and it also gives search engines information about what the image contains.

Why are alt tags important?

Answer: Alt tags are important for two main reasons: accessibility and SEO.

  • Accessibility: Alt text ensures that all users, including those using screen readers or other assistive technologies, can understand what an image is conveying. When a screen reader encounters an image, it will read out the alt text so the user knows what the image is. This is crucial for visually impaired users to fully experience content. For example, if an article has a chart or a photo, the alt text will communicate that information to someone who can't see it.
  • SEO and Image Search: Search engines crawl the text on your pages to understand content, and that includes alt text for images. Alt text helps search engine crawlers interpret what an image is about, since they can't "see" images like humans do. This can improve your visibility in image search results (e.g., Google Images). Additionally, having descriptive alt text can slightly improve the relevance of your page for certain keywords (if those keywords naturally appear in the alt text). It’s generally considered a positive quality signal to have alt text, whereas missing alt text is noted as a common SEO issue (a missed opportunity).

There’s also a practical benefit: if an image fails to load (due to a slow connection or an error), the browser will display the alt text in place of the image, so users still get an idea of what was there.

Because of these reasons, every image on your site should have an alt attribute (even if it’s empty for decorative images). It makes your site more accessible and can enhance SEO. In fact, studies have found that missing alt text is one of the most common accessibility errors on websites.

Does missing alt text affect SEO?

Answer: Missing alt text is primarily an accessibility issue, but it also has SEO implications (albeit relatively minor compared to major factors like content and backlinks). When an image has no alt text, search engines lose an opportunity to understand that image and potentially the context of the page. From an SEO perspective:

  • Image indexing: If an image lacks alt text, it’s less likely to rank in image search, because Google has less information about it. Alt text is a key part of how Google Image Search determines what an image is and when to show it.
  • Page quality: Technical SEO audits often flag missing alt tags as an issue. While one missing alt tag won’t hurt your rankings, having many missing can indicate a lack of thoroughness. Google’s algorithms consider overall page quality – and well-optimized images (with alt text) contribute to a better page experience. It’s like having missing meta descriptions or broken links; individually small, but collectively they can signal that a site isn’t fully optimized.

John Mueller of Google has stated that image alt text is important especially for image search, and it can have slight indirect benefits for normal search. It’s not a make-or-break ranking factor for general SEO, but it is definitely a best practice. Plus, remember the primary reason: accessibility. Ensuring alt text is present is part of maintaining a quality, inclusive website.

Bottom line: It’s worth fixing missing alt tags. It improves accessibility and you gain SEO value (especially for image visibility). There’s essentially no downside to having good alt text, aside from the effort to add it.

How do I add alt text to an image on my site?

Answer: To add alt text, you include the alt="" attribute within your image HTML tag. For example:

<img src="example.jpg" alt="Description of the image">

Replace "Description of the image" with the actual description of that image. Do this for every <img> tag in your HTML.

If you’re using a content management system (CMS) like WordPress, there’s usually a user-friendly way to add alt text. For instance, in WordPress when you upload an image, there’s an “Alt Text” field you can fill in. Other CMS platforms have similar fields in their media library or image settings. Enter the descriptive text there, and the system will add the alt attribute to the HTML for you.

Tips while adding alt text:

  • Always add alt text that describes the image’s content or function. If an image is purely decorative (adds no informative value), you can use an empty alt attribute (alt="") so it’s skipped by screen readers.
  • Keep it relatively short but meaningful. Think of one sentence or so that you would say if someone asked “what’s in this picture?”

After adding, you can double-check by viewing your page’s source (or using a browser inspector) to ensure the alt attributes are present and correctly filled.

How do I write good alt text for my images?

Answer: Writing good alt text means making it useful for users and informative for search engines, without being spammy. Here are some best practices:

  • Be descriptive and specific: Summarize what the image shows or its purpose. Include details that matter. For example, for a product image, “Red running shoes with white soles” is better than “Shoes.” For a complex chart, you might describe the trend or data it shows.
  • Keep it concise: Alt text should typically be a short phrase or a sentence at most. Aim for roughly 125 characters or less as a guideline (screen readers may stop reading after around that length, though they can handle longer). You don’t need to say “Image of…” – just describe the content. For instance, a good alt might be “Golden retriever puppy playing with a red ball on grass,” whereas a bad alt would be just “dog” or a very long paragraph detailing the whole scene unnecessarily.
  • Use keywords naturally, if relevant: If the image is relevant to your page’s topic, it’s okay if your alt text contains a keyword you’re targeting, but only if it makes sense. Don’t shoehorn keywords where they don’t belong. The alt text should read naturally and describe the image, not feel like a list of search terms.
  • Avoid redundancy: Don’t repeat information that’s already in surrounding text or captions, and don’t say “image of…” because screen readers announce images. Jump straight to the description. For example, instead of “Image of our team at the conference,” just write “Our team at the 2024 marketing conference.”
  • Decorative images should have empty alt: If an image is purely decorative or not important to the content (e.g., a background graphic or a divider icon), give it an empty alt attribute alt="". This tells assistive devices to skip it entirely. Only use non-empty alt text for meaningful images.

In summary, pretend you’re describing the image to someone over the phone – you’d want to convey the essential information clearly and succinctly. Do that, and you’ve likely written good alt text.

How can I find images on my site that are missing alt text?

Answer: You can easily identify images missing alt attributes using our free Missing Alt Text Checker tool right here at ReviewMySiteNow! Simply enter your website URL, and we'll automatically scan your site to detect images without proper alt text — no downloads or complicated setup needed.

Our tool provides:

  • Quick and accurate scans of your website’s images
  • Detailed reports showing which images are missing alt attributes
  • Accessibility improvement tips to help you fix issues
  • Completely free — no sign-up required

Additionally, you can optionally inspect pages manually using your browser's Developer Tools or accessibility browser extensions. However, for fast, easy, and complete results, ReviewMySiteNow is the easiest way to find and fix missing alt text instantly!

Keep your website accessible and SEO-friendly — start your free scan today!

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