Hidden links are one of those black hat SEO tactics that might seem clever until Google catches you. And trust me, Google will catch you.
In this article, we’ll get into hidden links, why people use them (spoiler: it’s not worth it), and how can they affect one’s SEO efforts.
I’ll also show you various ways to detect hidden links on your site and protect your website from these intrusive links, whether you put them there yourself or someone else planted them without your knowledge.
Let’s get into it.
Key Takeaways
- Hidden links are deceptive hyperlinks camouflaged within web pages, often used to manipulate search engine results, disseminate spam, and trick users into malware traps.
- Search engines like Google are actively improving their algorithms to detect and penalize the use of hidden links, which can significantly harm a website’s search ranking and credibility.
- To combat hidden links, website owners should regularly inspect their site’s code, use SEO tools for audits, update plugins and themes, implement anti-spam measures, deploy a web application firewall, and manage user-generated content carefully.
What Are Hidden Links?
Hidden links are hyperlinks that are deliberately hidden within a web page’s source code or made to look just like normal text.
Unlike regular links that stand out, because they’re usually underlined or in a different color, hidden links blend in.
This trickery is done so that you, the website visitor, can’t easily spot them, but search engines still can.
The goal is to manipulate search rankings or mislead you into clicking something you really shouldn’t. It’s deceptive by design, and it violates Google’s webmaster guidelines.
How People Hide Links (The Tactics You Need to Know)
There are several techniques people use to hide links on web pages. Understanding these methods helps you spot them on your own site.
Color Matching
Some links are made the same color as the background. You won’t notice them unless you accidentally click or highlight the text. White text on a white background. Black on black. You get the idea.
Tiny Text
Links are shrunk down so small that you’d need a magnifying glass to spot them. We’re talking 1px font size or smaller.
Off-Screen Links
Some links are placed way off to the side or the bottom of the webpage using CSS positioning, where you’d never think to look. They’re technically there, but not in the part of the page you can see.
Behind the Scenes
Links can be hidden in website code using CSS properties like display: none; or visibility: hidden; which makes them invisible unless you’re digging around in the website’s technical details.
Camouflaged in Graphics
Links can be disguised as part of a website’s graphics, like a decorative dot or line that doesn’t look clickable but is.
Punctuation Tricks
Sometimes, links are sneakily inserted in punctuation marks. You think you’re just seeing normal text, but there’s a link hidden in a period or a comma.
Match Font Color
A common technique is to match the link color to the font color, making links appear as normal text while still being clickable and crawlable by search engines.
Why Do People Use Hidden Links?
1. Manipulating search engines
Black hat SEOs use hidden links to trick search engines into thinking their website is more popular than it actually is.
They add links, which are like votes of confidence from other sites, that are not visible to visitors but can be seen by search engines.
This artificially inflates a website’s backlink profile, which may result in higher search engine rankings.
The keyword here is “may.” Search engines like Google are getting better at catching and penalizing this tactic. What might work for a few weeks will eventually get your site nuked from the search results.
2. Spamming websites
Unethical, black hat SEOs inject links into other websites without the website owners’ consent.
By concealing the links, like making them the same color as the background or hiding them in small, unnoticed elements, these individuals can sneak their links onto reputable sites.
This not only spreads their unwanted content but can also mislead search engines and people, all without the permission of the site owner.
If you’ve ever been hacked and suddenly had a bunch of spammy casino or pharma links on your site, this is what happened.
3. Tricking web visitors into installing malware
Perhaps the most dangerous use of hidden links is to trick people into downloading harmful software, or malware.
These links might be tucked away in images or parts of a website where you wouldn’t expect a link to be.
When someone accidentally clicks on one, it can install malware that might steal personal information or harm their computer.
This isn’t just an SEO problem; it’s a serious security threat.
How Google Detects and Penalizes Hidden Links
Hidden links can seem like a clever shortcut to boost your website’s search engine ranking, but this tactic is more of a ticking time bomb than a sustainable link-building strategy.
While hidden links might offer some short-term gains, the reality is that Google is constantly on the lookout for such deceptive practices.
The search engine’s primary goal is to maintain the integrity and relevance of its search results, and anything that tries to manipulate these results is met with strict penalties.
Over the years, Google has significantly improved its ability to identify and differentiate between legitimate backlinks and those that are spammy or hidden.
This advancement is partly due to a patent Google filed in 2009, named “Systems and methods for detecting hidden text and hidden links.”
This patent illustrates Google’s commitment to refining its technology to detect and penalize websites trying to game the system with hidden links.
Google’s stance on hidden links is clearly outlined in its Webmaster Guidelines on hidden text and links.
These guidelines emphasize that using hidden text or links to manipulate search engine rankings is a violation of Google’s SEO principles.
The guidelines serve as a warning to webmasters and SEO professionals to adhere to ethical SEO practices, reinforcing that transparency and quality are key to achieving and maintaining good search engine rankings.
So, what happens if you use hidden links, or even unknowingly have them on your site?
When Google discovers these hidden links, it doesn’t just penalize the party responsible for implementing them; it also penalizes the website hosting them.
This means that even if you’re unaware of hidden links on your site, you could still face repercussions, as Google holds site owners responsible for the content and practices employed on their platforms.
I’ve seen sites lose 60% to 80% of their organic traffic overnight because they were hacked and had hidden links planted on their pages. The site owner had no idea it happened until their rankings tanked.
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How to Find Hidden Links on Your Site
You need to actively hunt for hidden links on your site, especially if you run WordPress or accept user-generated content. Here’s how to do it.
1. Manually Inspect The Source Code
Inspecting the source HTML code manually might sound daunting, but it’s a direct approach to finding hidden links.
Here’s a step-by-step guide to make this process easier:
View Page Source
Right-click on your web page and select “View Page Source.” You’re now looking at the HTML that makes up your webpage. HTML is the language browsers use to display web pages. It’s made up of elements, and links are usually found within <a> tags.
Search for <a> Tags
Press Ctrl + F (or Cmd + F on Mac) to open the search bar and type in <a href=. This code snippet is the beginning of a link. Every time this snippet appears, it represents a link on your page. Check if the URL it points to is legitimate and relevant to your content.
Inspect Element
For a more detailed inspection, right-click on different parts of your web page and select “Inspect Element.” This opens the developer tools and highlights the part of the code that corresponds to where you clicked. It allows you to see how elements are nested and can help you spot hidden links that may not be visible on the page itself.
Check CSS
Sometimes, links are hidden using CSS (Cascading Style Sheets). Look for styles like display: none; or visibility: hidden; attached to link elements. These styles can make links invisible to visitors but still present in the code.
2. Use Ahrefs Site Audit Tool
The Ahrefs Site Audit tool is a powerful ally in detecting links hidden in your content.
Here’s how to use it more effectively:
Set Up and Run an Audit
Once you connect your site, choose to run a full audit. This process can take some time, depending on your website’s size.
Review the Link Explorer Report
Navigate to the Link Explorer report, click on External Links, and manually check all outbound links.
Analyze Link Patterns
Look for unusual patterns, such as many pages linking to a single irrelevant page, as this is one of the telltale signs of hidden links or a compromised site.
3. Utilize Other SEO Tools
There are more tools in the toolbox to help you find hidden links.
Here are a few of them:
Screaming Frog
This tool crawls your website, emulating how a search engine would view it. After the crawl, you get a list of all the links found on your site. You can filter this list to look specifically for scripts, external links, or redirects, which might hide or point to hidden content.
Sitebulb
Beyond crawling, Sitebulb provides visualizations of your website’s architecture. This can help you see how pages are interconnected and whether there are any unusual or unexpected links. It’s particularly useful for spotting patterns that don’t make sense, like unrelated pages linking to each other.
WP External Links
If you’re using WordPress, this plugin can be a lifesaver. It helps you manage all external links on your site. You can set it to add nofollow tags, open links in new tabs, or even add icons next to links. It can automatically detect and flag links that may be hidden or using suspicious attributes.
How to Protect Your Site from Hidden Links
Finding hidden links is one thing. Preventing them from appearing in the first place is another. Here’s how to lock down your site.
1. Regularly Update Plugins and Themes
SEO spammers are on the lookout for popular plugins and themes that are no longer updated or maintained, using them to gain access to your website.
To avoid this, regularly check the state of your plugins and themes.
If you discover any that haven’t been updated for a long time or seem abandoned, it’s time to replace them.
Opt for alternatives that receive consistent updates and improvements.
A good rule of thumb is to perform this audit at least once a year, though twice is even better.
Outdated plugins are one of the most common entry points for hackers who plant hidden links on your site.
2. Implement Anti-Spam Measures
Just as you’d install a security system in your home to keep out unwanted visitors, antispam plugins serve a similar function for your website.
They’re particularly handy if your site is built on popular platforms like WordPress, Joomla, or Drupal.
One highly recommended tool is Akismet.
It’s a robust antispam plugin that helps filter out spammy comments, contact form submissions, and even fishy user registrations.
Other plugins that can help protect your site from spam and other security threats include:
3. Set Up a Strong Web Application Firewall
A web application firewall (WAF) is like your property’s fence and gate, monitoring who comes in and out.
Services like Cloudflare WAF, AWS WAF, Barracuda WAF, and Citrix WAF scrutinize incoming traffic to your site, distinguishing between legitimate visitors and potential threats.
They assess every HTTP request, filtering out anything suspicious and protecting you from the most common intrusion techniques.
This way, you ensure that only the right visitors, your actual audience, can engage with your content. A good WAF can stop hidden link attacks before they even happen.
FAQs
What is a hidden link?
A hidden link is a URL that is not visible or easily accessible to users on a website. It can be used for restricted access or to redirect users without their knowledge. In most cases, it’s used for manipulative SEO or malicious purposes.
How do I make a hidden hyperlink?
You can create a hidden hyperlink by using the HTML tag span> instead of a> and making it clickable through JavaScript. This way, the link will be functional for users, but search engine robots won’t consider it as a link. You can create a hidden hyperlink by using CSS to make it invisible or by placing it off-screen. However, I strongly advise against this. It violates Google’s webmaster guidelines and will get your site penalized.
What are some anti-spam measures I can implement to protect against hidden links?
You can protect against hidden links by implementing anti-spam measures like using plugins such as Akismet, Antispam Bee, and WP Armour, deploying CAPTCHA challenges, and implementing challenging security questions. These measures help to prevent hidden links from being posted on your website through comments or user-generated content.
Last Words
While hidden link-building techniques can get you short-term SEO benefits, the risks massively outweigh any potential gains.
Google has become very good at detecting these unnatural links, and they’ll penalize both parties (the person who created the hidden links and the site hosting them).
And that’s why it’s crucial to protect your website from such practices.
If you need help with your link-building, feel free to book a courtesy consultation call with one of our SEO strategists.
During this call, we’ll go through your website, learn about your business goals, and show you how to achieve them without risking your rankings.
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