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SEO Best Practice for Alt Text

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SEO Best Practice for Alt Text

In a Google Office-hours hangout, Google’s John Mueller answered a question about how to use alt text for SEO. Along the way he dispelled the idea that there is a 16 word limitation on alt text and suggested ways to use the Alt Text that would be good for SEO.

Alt Text

Alt text is a reference to Alternative Text for Images. The purpose of image alt text is to describe what is in an image for people who are accessing a web page with a screen reader.

A screen reader is an assistive device that helps people with visual impairments access web documents, among other things.

The screen reader reads computer documents aloud so that the person accessing the documents can listen to what is written.

Does Google Read More than 16 Words in an Image Alt Text?

John summarized a question that was submitted to him.

He said it was from a food blogger:

“Google said that there’s a maximum of 16 words that you can use in your alt text.

And the question is, does Google read the rest of my alt text and what does this mean for usability?”

Mueller answered the question:

“And I think the important part here is we don’t have any guidelines with regards to how long your alt text can be.

So from a Google Search point of view, you can put a lot of things in the alt text for an image, if that’s relevant for that particular image.”

16 Word Alt Text Limit?

The person asking the question made reference to what they believed was a Google limit of 16 words that can be used in alt text.

The source of this idea might be from an SEO test that sought to identify text in an image alt text was searchable in Google Images.

The test used non-existent words (essentially gibberish) and discovered that Google couldn’t find images by using more than 16 words to search for it.

Using gibberish to test Google tends to result in flawed “SEO test” results.

The reason that using gibberish is a flawed methodology is because Google is designed to rank actual words and is not designed to rank gibberish.

So for gibberish it may very well be that Google will pull the regular algorithm (since it doesn’t apply) and simply try to do a straight match from query to web page, which is not  how Google search normally works.

Whether that mistake had an impact on the SEO test is an open question.

The point is that the 16 word limit was not imposed by Google but was established from the results of an SEO test.

Mueller Explains How to Use Image Alt Text

Mueller next offered an explanation of how Google uses alternative text in images and what it means for how to use alt text for SEO purposes.

Mueller continued his answer:

“When it comes to the alt text, we primarily use that to better understand the image.

So if someone is searching …in Google Images for something that kind of matches the alt text then we can use that to understand that your image is relevant for that alt text on that specific page.

That’s kind of the primary use case of the alt text.

We do also use the alt text as a part of the page. But that to me, that’s usually something that is already visible on the page anyway.

So it’s less something that is critical to the page itself.

So I would really use it as something that applies to the image and I would use it for usability and for Google Images to better understand that specific image.”

What Words to Use in Alt Text

Mueller next began explaining how to choose the best words for the image alt text.

Mueller continued:

“And I think what might also be worth mentioning is when it comes to Google images, you don’t necessarily need to describe exactly what is in the image.

But rather, kind of like what this image means for your particular page.

So if you have a picture of a beach, you could use an alt text and say, Oh this is a beach.

But you could also say, this is the beach in front of our hotel or this is the beach that we took a photo of when we were doing a chemical cleanup.

And kind of those intents are very different and people would be searching in different ways in Google Images to find more information there. And giving that extra context always makes sense, in my opinion.”

Use Alt Text to Provide Context

John Mueller essentially encouraged SEOs and publishers to use words that provide context to the image within the web page so that when someone with a screen reader comes across the image the context of how that image fits into the content of the web page will become clearer.

So if you have a doubt as to what to put into the image alt text, it’s a good practice to think of how to describe the image for someone with a visual impairment and then use that description within the alt text.

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SEO for Alt Text

Watch at the 46:49 Minute Mark:

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State Of Marketing Data Standards In The AI Era [Webinar]

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State Of Marketing Data Standards In The AI Era [Webinar]

Claravine and Advertiser Perceptions surveyed 140 marketers and agencies to better understand the impact of data standards on marketing data, and they’re ready to present their findings.

Want to learn how you can mitigate privacy risks and boost ROI through data standards?

Watch this on-demand webinar and learn how companies are addressing new privacy laws, taking advantage of AI, and organizing their data to better capture the campaign data they need, as well as how you can implement these findings in your campaigns.

In this webinar, you will:

  • Gain a better understanding of how your marketing data management compares to enterprise advertisers.
  • Get an overview of the current state of data standards and analytics, and how marketers are managing risk while improving the ROI of their programs.
  • Walk away with tactics and best practices that you can use to improve your marketing data now.

Chris Comstock, Chief Growth Officer at Claravine, will show you the marketing data trends of top advertisers and the potential pitfalls that come with poor data standards.

Learn the key ways to level up your data strategy to pinpoint campaign success.

View the slides below or check out the full webinar for all the details.

Join Us For Our Next Webinar!

SaaS Marketing: Expert Paid Media Tips Backed By $150M In Ad Spend

Join us and learn a unique methodology for growth that has driven massive revenue at a lower cost for hundreds of SaaS brands. We’ll dive into case studies backed by real data from over $150 million in SaaS ad spend per year.

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GPT Store Set To Launch In 2024 After ‘Unexpected’ Delays

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GPT Store Set To Launch In 2024 After 'Unexpected' Delays

OpenAI shares its plans for the GPT Store, enhancements to GPT Builder tools, privacy improvements, and updates coming to ChatGPT.

  • OpenAI has scheduled the launch of the GPT Store for early next year, aligning with its ongoing commitment to developing advanced AI technologies.
  • The GPT Builder tools have received substantial updates, including a more intuitive configuration interface and improved file handling capabilities.
  • Anticipation builds for upcoming updates to ChatGPT, highlighting OpenAI’s responsiveness to community feedback and dedication to AI innovation.

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96.55% of Content Gets No Traffic From Google. Here’s How to Be in the Other 3.45% [New Research for 2023]

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96.55% of Content Gets No Traffic From Google. Here's How to Be in the Other 3.45% [New Research for 2023]

It’s no secret that the web is growing by millions, if not billions of pages per day.

Our Content Explorer tool discovers 10 million new pages every 24 hours while being very picky about the pages that qualify for inclusion. The “main” Ahrefs web crawler crawls that number of pages every two minutes. 

But how much of this content gets organic traffic from Google?

To find out, we took the entire database from our Content Explorer tool (around 14 billion pages) and studied how many pages get traffic from organic search and why.

How many web pages get organic search traffic?

96.55% of all pages in our index get zero traffic from Google, and 1.94% get between one and ten monthly visits.

Distribution of pages by traffic from Content Explorer

Before we move on to discussing why the vast majority of pages never get any search traffic from Google (and how to avoid being one of them), it’s important to address two discrepancies with the studied data:

  1. ~14 billion pages may seem like a huge number, but it’s not the most accurate representation of the entire web. Even compared to the size of Site Explorer’s index of 340.8 billion pages, our sample size for this study is quite small and somewhat biased towards the “quality side of the web.”
  2. Our search traffic numbers are estimates. Even though our database of ~651 million keywords in Site Explorer (where our estimates come from) is arguably the largest database of its kind, it doesn’t contain every possible thing people search for in Google. There’s a chance that some of these pages get search traffic from super long-tail keywords that are not popular enough to make it into our database.

That said, these two “inaccuracies” don’t change much in the grand scheme of things: the vast majority of published pages never rank in Google and never get any search traffic. 

But why is this, and how can you be a part of the minority that gets organic search traffic from Google?

Well, there are hundreds of SEO issues that may prevent your pages from ranking well in Google. But if we focus only on the most common scenarios, assuming the page is indexed, there are only three of them.

Reason 1: The topic has no search demand

If nobody is searching for your topic, you won’t get any search traffic—even if you rank #1.

For example, I recently Googled “pull sitemap into google sheets” and clicked the top-ranking page (which solved my problem in seconds, by the way). But if you plug that URL into Ahrefs’ Site Explorer, you’ll see that it gets zero estimated organic search traffic:

The top-ranking page for this topic gets no traffic because there's no search demandThe top-ranking page for this topic gets no traffic because there's no search demand

This is because hardly anyone else is searching for this, as data from Keywords Explorer confirms:

Keyword data from Ahrefs' Keywords Explorer confirms that this topic has no search demandKeyword data from Ahrefs' Keywords Explorer confirms that this topic has no search demand

This is why it’s so important to do keyword research. You can’t just assume that people are searching for whatever you want to talk about. You need to check the data.

Our Traffic Potential (TP) metric in Keywords Explorer can help with this. It estimates how much organic search traffic the current top-ranking page for a keyword gets from all the queries it ranks for. This is a good indicator of the total search demand for a topic.

You’ll see this metric for every keyword in Keywords Explorer, and you can even filter for keywords that meet your minimum criteria (e.g., 500+ monthly traffic potential): 

Filtering for keywords with Traffic Potential (TP) in Ahrefs' Keywords ExplorerFiltering for keywords with Traffic Potential (TP) in Ahrefs' Keywords Explorer

Reason 2: The page has no backlinks

Backlinks are one of Google’s top three ranking factors, so it probably comes as no surprise that there’s a clear correlation between the number of websites linking to a page and its traffic.

Pages with more referring domains get more trafficPages with more referring domains get more traffic
Pages with more referring domains get more traffic

Same goes for the correlation between a page’s traffic and keyword rankings:

Pages with more referring domains rank for more keywordsPages with more referring domains rank for more keywords
Pages with more referring domains rank for more keywords

Does any of this data prove that backlinks help you rank higher in Google?

No, because correlation does not imply causation. However, most SEO professionals will tell you that it’s almost impossible to rank on the first page for competitive keywords without backlinks—an observation that aligns with the data above.

The key word there is “competitive.” Plenty of pages get organic traffic while having no backlinks…

Pages with more referring domains get more trafficPages with more referring domains get more traffic
How much traffic pages with no backlinks get

… but from what I can tell, almost all of them are about low-competition topics.

For example, this lyrics page for a Neil Young song gets an estimated 162 monthly visits with no backlinks: 

Example of a page with traffic but no backlinks, via Ahrefs' Content ExplorerExample of a page with traffic but no backlinks, via Ahrefs' Content Explorer

But if we check the keywords it ranks for, they almost all have Keyword Difficulty (KD) scores in the single figures:

Some of the low-difficulty keywords a page without traffic ranks forSome of the low-difficulty keywords a page without traffic ranks for

It’s the same story for this page selling upholstered headboards:

Some of the low-difficulty keywords a page without traffic ranks forSome of the low-difficulty keywords a page without traffic ranks for

You might have noticed two other things about these pages:

  • Neither of them get that much traffic. This is pretty typical. Our index contains ~20 million pages with no referring domains, yet only 2,997 of them get more than 1K search visits per month. That’s roughly 1 in every 6,671 pages with no backlinks.
  • Both of the sites they’re on have high Domain Rating (DR) scores. This metric shows the relative strength of a website’s backlink profile. Stronger sites like these have more PageRank that they can pass to pages with internal links to help them rank. 

Bottom line? If you want your pages to get search traffic, you really only have two options:

  1. Target uncompetitive topics that you can rank for with few or no backlinks.
  2. Target competitive topics and build backlinks to rank.

If you want to find uncompetitive topics, try this:

  1. Enter a topic into Keywords Explorer
  2. Go to the Matching terms report
  3. Set the Keyword Difficulty (KD) filter to max. 20
  4. Set the Lowest DR filter to your site’s DR (this will show you keywords with at least one of the same or lower DR ranking in the top 5)
Filtering for low-competition keywords in Ahrefs' Keywords ExplorerFiltering for low-competition keywords in Ahrefs' Keywords Explorer

(Remember to keep an eye on the TP column to make sure they have traffic potential.)

To rank for more competitive topics, you’ll need to earn or build high-quality backlinks to your page. If you’re not sure how to do that, start with the guides below. Keep in mind that it’ll be practically impossible to get links unless your content adds something to the conversation. 

Reason 3. The page doesn’t match search intent

Google wants to give users the most relevant results for a query. That’s why the top organic results for “best yoga mat” are blog posts with recommendations, not product pages. 

It's obviously what searchers want when they search for "best yoga mats"It's obviously what searchers want when they search for "best yoga mats"

Basically, Google knows that searchers are in research mode, not buying mode.

It’s also why this page selling yoga mats doesn’t show up, despite it having backlinks from more than six times more websites than any of the top-ranking pages:

Page selling yoga mats that has lots of backlinksPage selling yoga mats that has lots of backlinks
Number of linking websites to the top-ranking pages for "best yoga mats"Number of linking websites to the top-ranking pages for "best yoga mats"

Luckily, the page ranks for thousands of other more relevant keywords and gets tens of thousands of monthly organic visits. So it’s not such a big deal that it doesn’t rank for “best yoga mats.”

Number of keyword rankings for the page selling yoga matsNumber of keyword rankings for the page selling yoga mats

However, if you have pages with lots of backlinks but no organic traffic—and they already target a keyword with traffic potential—another quick SEO win is to re-optimize them for search intent.

We did this in 2018 with our free backlink checker.

It was originally nothing but a boring landing page explaining the benefits of our product and offering a 7-day trial: 

Original landing page for our free backlink checkerOriginal landing page for our free backlink checker

After analyzing search intent, we soon realized the issue:

People weren’t looking for a landing page, but rather a free tool they could use right away. 

So, in September 2018, we created a free tool and published it under the same URL. It ranked #1 pretty much overnight, and has remained there ever since. 

Our rankings over time for the keyword "backlink checker." You can see when we changed the pageOur rankings over time for the keyword "backlink checker." You can see when we changed the page

Organic traffic went through the roof, too. From ~14K monthly organic visits pre-optimization to almost ~200K today. 

Estimated search traffic over time to our free backlink checkerEstimated search traffic over time to our free backlink checker

TLDR

96.55% of pages get no organic traffic. 

Keep your pages in the other 3.45% by building backlinks, choosing topics with organic traffic potential, and matching search intent.

Ping me on Twitter if you have any questions. 🙂



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