Keyword Density in SEO: Keyword Optimization Best Practices

Getting your ecommerce site to rank in Google search can feel like chasing a moving target. As search algorithms evolve, old tactics like keyword stuffing no longer work—and can even hurt your business.

In the past, keyword density was considered a golden rule: Mention a phrase a certain number of times, and your page would rank. Today, however, modern search engines have evolved far beyond simply counting keywords. While keyword usage still matters in search engine optimization (SEO), obsessing over specific counts can hurt readability and, ultimately, conversions.

Learn how keyword density works today, how to use it effectively without overdoing it, and how modern tools help business owners write content that ranks and resonates with real customers.

What is keyword density?

Keyword density refers to how often a keyword appears compared to the total number of words on a web page. This helps search engines understand what your page is about so they can rank it for relevant queries. It’s typically expressed as a percentage of the total word count, following this formula:

Keyword density = (Total target keyword mentions / Total words) x 100

For example, in Gymshark’s legging lengths guide on its blog, the keyword phrase “legging length” appears 11 times over 2,127 total words, bringing its keyword density to 0.5%.

The role of keyword density in SEO

Keyword density once directly influenced search results. Over the past decade, however, Google has updated its algorithms to prioritize natural language over exact-match keywords. Google understands that different words can describe the same concept, and that meaning matters more than repetition. For example, although the term “jeans” appears only a few times on Duer’s homepage, Google can still identify the page as being about jeans based on related terms like “denim,” “pants,” and “high-rise.”

That said, keyword density can still be a helpful starting point, especially for novice marketers, to check whether a target keyword appears too often, since excessive keyword occurrences or awkward repetition can be considered keyword stuffing. This can lower your content quality and negatively affect rankings.

Beyond keyword density: Understanding TF-IDF

Keyword density measures how often a specific word or phrase appears. Term frequency-inverse document frequency (TF-IDF) takes this further, encouraging you to look beyond simple keyword counts to assess how relevant a term is to the page’s core topic. To determine TF-IDF, you analyze a target term along with related terms commonly found on similar pages across the web to evaluate how important that term is within a broader set of similar content. 

This matters, because a word can mean entirely different things on different web pages. For example, “death wish” could refer to a movie or a state of mind, but when combined with the term “coffee” and other phrases like “brew,” “drip,” and “fair trade,” search engines understand that the page is actually about the Death Wish coffee brand.

In practice, TF-IDF is best understood as a conceptual model that explains why repetition alone doesn’t determine relevance. Keyword research tools like Surfer SEO and Yoast for Shopify and WordPress can help you identify related terms and content gaps. While they don’t provide a formal TF-IDF score, they suggest keywords and phrases that strengthen topical relevance.

How to use keyword density today

In today’s search landscape, keyword density is best used as a reference point—not a target. Like other keyword metrics (e.g., search volume, keyword difficulty), it works best as a guide rather than a goal.

There’s no officially recommended keyword density, but many SEO professionals consider 1% to 2% a reasonable benchmark. That means for every 100 words, the primary keyword may appear one or two times. You can use related terms and variations naturally throughout the page to reinforce the topic.

This is only a guideline. Your content could include fewer than 1% of keywords, and that’s OK. In fact, with modern search engine approaches, being slightly under the benchmark is generally safer than significantly exceeding it. Keyword density is often most useful as a quick check to ensure your content doesn’t drift into excessive repetition. It’s more important for your content to be helpful, clear, and in-depth than to hit a specific number. 

Keyword optimization best practices

• Focus on readability
• Write for topics, not keywords
• Use synonyms and variations
• Review keyword placement
• Consider search intent

Keyword density still plays a role in SEO, but it’s only one part of a larger optimization strategy. Rather than aiming for a specific keyword percentage, focus on creating useful, well-structured content that aligns with search intent. 

Focus on readability

Content that’s written for people, rather than search engines, tends to perform better over time. Although keywords still play a role in SEO, you should use them in support of content clarity and flow and not as a manipulation tactic. Quality content that’s enjoyable to read can improve engagement, reduce bounce rates, and increase time on page—signals that often indicate useful content. Even perfectly optimized keywords won’t compensate for content that lacks clarity, accuracy, or real expertise.

Readability isn’t only about the words on the page. How you structure the content also matters. Include the following to help readers and search engines understand your page:

• Short paragraphs

• Clear headings

• Bullet points

• Tables

• Simple sentence structure

In Shopify, you can use the built-in SEO settings to review and edit how your page appears in search results—including your title tag, meta description, and URL—directly within the platform.

Write for topics, not keywords

Search engines favor topical depth over repetition. Rather than optimizing a page around one keyword, focus on covering the entire topic in depth. Start by identifying the core topic and search intent, then structure your content around related questions and subtopics. Use keywords and variations naturally throughout the page to improve topical clarity and create content that’s helpful and easy to read.

Beardbrand’s blog post, “What To Know Before Buying a Beard Straightener,” is a strong example of topical depth. It covers beard straightening from multiple angles, including:

• Explanations of different types of beard straighteners and hot hair brushes

• Heat and hair science

• Step-by-step guides for both straightening and blow-dry methods

• Product testing and recommendations

• Frequently asked questions

Use synonyms and variations

Modern search engines can understand semantic meaning, so you don’t need to repeat the same key phrase as in the past. Add synonyms, related terms, and variations to help search engines understand your content in context. This prevents keyword stuffing and improves readability while reinforcing your coverage of the topic.

There are many apps in Shopify’s App Store, such as Yoast, that can suggest keyword improvements and highlight opportunities to strengthen your content’s clarity and relevance.

Review keyword placement

Keyword placement often matters more than raw keyword frequency since search engines value context and relevance over repetition alone. 

High-performing content often includes relevant keywords in areas like the H1, introduction, subheadings, meta description, and URL slug. Most pages are built around one primary keyword, supported by a small set of closely related secondary keywords that reinforce the main topic.

Add secondary keywords and synonyms naturally throughout your content. These may include long-tail variations (more specific, multiword phrases) or related phrases to reinforce the main keyword. Incorporate these into the remaining subheadings (H2 and H3), body text, anchor links, and image alt text. 

In the Beardbrand example:

• The primary keyword “beard straightener” appears in the H1, the first 100 words, and prominent H2 headers. 

• Secondary terms such as “heated brushes” and “hot air brushes” appear in H3 headers and body copy. 

• Anchor text uses related terms like “beard oil” and “utility balm.”

• Keywords are spread naturally across the blog, with content organized around the broader topic of beard straightening rather than just repeating the key phrase.

Consider search intent

Search intent reflects what your audience is looking for and what they hope to achieve. There are three main categories:

• Informational. The user wants to learn something.

• Navigational. The user is trying to find a specific page.

• Transactional. The user wants to buy something. 

Understanding search intent helps you choose the right related keywords and structure your content accordingly. For example, the key phrase “best beard straightener” is a transactional phrase. The user is looking for specific products to help them make a decision, so including sections on different types of beard straighteners with product reviews will align with their intent. 

A key phrase like “how to straighten your beard” is an informational phrase. The user is looking to learn how to straighten their beard, so the content should include step-by-step guidance.