Backlink Quality & Metrics – How to Evaluate Your Link Profile

Key Backlink Metrics to Check and Track

SEO tools (like Moz, Ahrefs, Majestic, SEMrush) provide various metrics that indicate different aspects of backlink quality. Here are the most important ones:

• Domain Authority (DA): A proprietary score by Moz (1–100) predicting a site’s overall ability to rank. It’s largely based on the quantity and quality of links pointing to the entire domain. Higher DA means the site is stronger (like a vote from that site carries more weight). Note: Google does not use DA internally; it’s a third-party metric. But high-DA sites often correlate with higher trust and rankings. Use DA as a comparative metric – e.g., aim for links from sites with equal or higher DA than yours when possible.

• Domain Rating (DR): Similar to DA, but by Ahrefs. Measures the strength of a site’s backlink profile on a log scale up to 100. DR emphasizes unique referring domains and dofollow links – getting one link from 10 different sites boosts DR more than 10 links from one site. Like DA, it’s best used relatively (your DR vs competitors). High-DR sites are generally authoritative.

• Page Authority (PA) & URL Rating (UR): Metrics by Moz (PA) and Ahrefs (UR) that score the strength of an individual page’s backlinks. This matters because a link from a high-authority page (even if the site overall is new) can be valuable. For instance, a brand new site might have low DA, but if one of its specific blog posts went viral and amassed many backlinks, that page’s PA/UR could be high – making a link from that page potent.

• Referring Domains & Linking Root Domains: The number of distinct websites linking to your site. Generally, having links from 100 different sites is better than 100 links from one site. Search engines count each domain as a “vote.” After the first link or two, additional links from the same site have diminishing returns. So, diversify your referring domains. You can track the total count and see growth over time. Keep an eye on new referring domains acquired as a campaign KPI.

• Anchor Text Distribution: The anchor text is the clickable text of a backlink (often blue underlined). It provides context to search engines about the content of the page being linked. Keywords in backlink anchor text can influence rankings – e.g., lots of anchors saying “best Italian restaurant” pointing to your site could boost you for that term. However, over-optimized anchor text (too many keyword anchors) is a red flag for Google’s Penguin algorithm.

Best practice is to have a natural mix of anchors:

• Branded anchors (your brand/name)

• Generic anchors (“click here”, “this article”)

• Naked URL (the URL itself)

• and some keyword-rich anchors (exact or partial match keywords)

How to Optimize Your Anchor Text Profile: Avoid Keyword Overuse and Build Safer Backlinks

Anchor text diversity is essential for a healthy backlink profile. If 90% of your backlinks use the same keyword-rich anchor, it appears manipulative—and search engines may penalize it. High-ranking websites typically show a natural mix of anchor types.

Use SEO tools like Ahrefs or Semrush to audit your anchor text distribution. Focus on the following:

• Avoid excessive exact-match keyword anchors

• In guest posts, rotate between brand names, URL anchors, and natural phrases

• Flag spammy or unrelated anchors—they may point to negative SEO or low-quality link sources

A balanced anchor text mix enhances credibility, supports long-term rankings, and reduces the risk of algorithmic penalties.

Dofollow vs. Nofollow Links: How They Impact SEO and When to Use Each Type

Dofollow links are the default and pass link equity (PageRank) to the linked page. These links are treated as endorsements by search engines and have a direct impact on rankings.

Nofollow links include the rel="nofollow" attribute, signaling to search engines not to pass ranking credit. Historically, Google ignored these links entirely. Since 2019, however, Google treats nofollow as a hint—it may crawl and index the link, but typically won’t pass authority.

Common examples of nofollow links include:

• Wikipedia citations

• YouTube comment links

• News site comment sections

Key takeaway:
A healthy backlink profile includes both types. Dofollow links directly boost your rankings. Nofollow links, while less influential algorithmically, can still drive referral traffic, build brand visibility, and support indexing.

What Is a Natural Backlink Profile? Ideal Dofollow vs. Nofollow Link Ratios for SEO

A balanced backlink profile includes both dofollow and nofollow links. While dofollow links from high-authority domains provide the most SEO value by passing PageRank, nofollow links are also a normal part of any natural link profile.

Examples of common nofollow sources:

• Social media profiles

• Press releases

• Blog or forum comments

Having 100% dofollow links may signal manipulative link building. Although there’s no fixed rule, healthy websites often show a ratio like 60–90% dofollow and 10–40% nofollow. Focus on gaining dofollow links for ranking power, but don’t dismiss quality nofollow links—they still offer referral traffic, brand visibility, and link diversity.

Google’s Expanded Nofollow Attributes

In addition to rel="nofollow", Google now recognizes:

• rel="ugc" for user-generated content (e.g., forums, comments)

• rel="sponsored" for paid or promotional links

These variants fall under the nofollow category. For instance, if you publish a sponsored post and tag the outbound link as rel="sponsored", Google will treat it as nofollow — ensuring compliance while avoiding penalties.

What Is Moz’s Spam Score? How to Evaluate Link Risk for SEO

Moz’s Spam Score is a percentage-based metric (0–100%) that estimates how likely a domain appears spammy. It analyzes 27 risk signals commonly found on penalized websites—such as:

• Exact-match domains

• Low content quality

• Unnatural link structures

• Few or no outgoing links

How to Interpret Spam Score Ranges

• 0–30% = Low risk

• 31–60% = Moderate risk

• 61–100% = High risk

A high Spam Score can indicate a potentially toxic site, making it risky for backlink acquisition. Before pursuing a link, check the domain’s score using tools like Moz Link Explorer.

Use Spam Score as a Red Flag, Not a Rule

While Google doesn’t use Moz’s Spam Score in its algorithm, it remains a useful diagnostic indicator. If your own site’s score climbs, it may signal that your backlink profile includes spammy domains—a sign to audit and possibly disavow harmful links.

Important: Don’t rely on Spam Score alone. Combine it with other metrics like domain authority, organic traffic, and relevance to make link decisions.

What Are Trust Flow and Citation Flow? Majestic SEO Metrics Explained

Trust Flow (TF) and Citation Flow (CF) are core link metrics from Majestic SEO used to evaluate the quality and influence of a website’s backlink profile. Together, they help assess both the trustworthiness and link power of a domain.

• • Citation Flow: measures the quantity of links to a site/page (similar to raw popularity).

• • Trust Flow: measures the quality of those links by evaluating how close your links are to a set of known trusted “seed sites”. In essence, a site with many links might have high CF, but if those links are from sketchy websites, its TF will be low.

• • A high TF relative to CF is ideal – it means your backlinks are from trusted sources. For example, .edu and .gov links (often highly trusted) would boost Trust Flow. SEOs sometimes use the TF/CF ratio to gauge link profile health (a very low ratio might imply a lot of junky links).

• • Topical Trust Flow: Majestic also categorizes trust by topic (e.g., if you have links from trusted sites in “Health”, you’ll have a high health topical TF). This helps see if you’re getting trusted links in your specific niche. For instance, a finance blog with many links from trusted finance sites has better topical authority than one whose links are mostly from unrelated niches. 

• • Organic Traffic/Rankings of Referring Site: A more intuitive “metric” – check if the site linking to you has decent organic traffic itself (tools like Ahrefs can estimate a domain’s monthly organic visitors). If a site has zero organic traffic, it could be de-indexed or low-quality. If it has thousands of visitors and ranks for many keywords, that’s a good sign (Google trusts it). Also, if the page linking to you is actually indexed in Google and potentially ranking, that link can send traffic your way too. A link from a high-traffic page can be more valuable (both for SEO and referrals) than one buried on a page no one sees.

In summary, these metrics help paint a picture of your backlink profile’s strength and weaknesses.

Here’s a quick reference table of key metrics:

Quality vs. Toxic Backlinks: What to Look For

Using the metrics above, plus your own analysis, you can classify backlinks broadly into “good” vs “bad”.

Quality Backlinks typically come from:

• Authoritative sites in your industry or well-known generic authoritative sites (news outlets, universities, government sites, high-quality blogs). These have high DA/DR, solid Trust Flow, and real human visitors.

• Relevant context: The link is surrounded by related content. For example, your bakery website getting a link from a popular food blog’s article on cake recipes – very relevant (good). Versus a random link in a completely unrelated article (less valuable).

• Natural anchor text: The linking site uses an anchor that fits naturally in the sentence (could be your brand name or “this article on [topic]”). It’s not stuffed with awkward exact keywords.

• Editorial links: The link was given by the site owner/editor because they genuinely wanted to reference your content (as opposed to you placing it yourself via a forum comment or paying for it). Editorial votes carry the most weight.

Diverse sources: Your quality links come from a variety of different domains and types of sites (blogs, news, directories, etc.), indicating organic growth.

Toxic or Low-Quality Backlinks often have these traits:

• Spammy websites: These sites exist solely to host links or have thin content. They might have names like best-seo-trick.info or a network of blogspot blogs with spun articles. They typically have high Spam Scores and low Trust Flow (or TF=0).

• Irrelevant or nonsensical context: For instance, a link to your bakery site appears in a blog post about online poker or in a completely unrelated foreign-language article. This could indicate an unnatural link (possibly bought or placed via automated programs).

• Over-optimized anchor text: If a chunk of your backlinks come from questionable sites all using the anchor “best bakery New York free cupcakes”, that’s a sign of manipulation. Genuine sites would rarely all use the same perfect keyword.

• Link exchanges or footprints: Networks of sites all interlinking heavily. If you notice many links coming from sites that all seem connected or share Google Analytics IDs, etc., it could be a private network (PBN). Google actively tries to nullify these.

• Site with no real traffic/authority: A domain that has a high number of outbound links (linking out to hundreds of sites) but virtually no content or rankings of its own. These are likely link farms.

Google’s algorithms (like Penguin and the newer SpamBrain AI) are pretty good at identifying and discounting spammy links, so a few bad apples usually won’t hurt you if you also have lots of good links.

But if too high a percentage of your profile is toxic, you could face a manual penalty or algorithmic demotion. It’s wise to periodically audit your backlinks (using Google Search Console’s link report or other tools) to spot any glaring toxic links.

In severe cases, you can use Google’s Disavow Tool to tell Google to ignore certain backlinks – but that’s generally a last resort for links you suspect caused a penalty (more on that in Cluster 5).

Monitoring & Improving Your Backlink Profile

Regularly check metrics like your total referring domains, Domain Authority/Rating, and organic traffic to gauge progress.

For example, if you launch a link-building campaign, you should see referring domains count rise and hopefully an uptick in DA/DR over months.

Keep an eye on anchor text spread to ensure you maintain a healthy diversity.

If you find any anomalies (like a sudden surge of spam links you didn’t build), investigate their source – occasionally competitors may build bad links to your site (negative SEO), though this is less common to cause harm now due to Google’s filters.

In short, backlink quality matters more than quantity in 2026.

Use the above metrics to focus your efforts on acquiring links that count, and don’t lose sleep over low-value links – every site accrues some of those naturally.

In the next cluster, we’ll delve into Google’s policies and how to stay on the right side of them, particularly regarding “bad” link-building practices.

Used ressources for this article:

Backlink metrics

MOZ spam score

Link building metrics