On-Page SEO Checklist: 15 Items

On-page SEO covers everything you control on individual pages of your website. Title tags, content, images, internal links—elements you can optimise without waiting for anyone else. This checklist covers the 15 elements that matter most, each one with a clear action you can take today.

TL;DR: Consistent publication of satisfying content is Google's top-weighted ranking factor (First Page Sage). Google shortens 61% of title tags because they are too long (First Page Sage). And mobile devices account for 56.86% of UK web traffic (SQ Magazine), making mobile optimisation non-negotiable.

Use this as a reference when creating new pages or auditing existing ones. You do not need perfect scores on every element, but covering these basics puts you ahead of most competitors. From our work optimising websites for Cornwall businesses, we find that systematically working through this checklist typically produces measurable ranking improvements within 8–12 weeks.

1. Title Tag: Is It Optimised?

Your title tag appears in search results and browser tabs, making it one of the most important on-page ranking signals. According to First Page Sage, Google shortens 61% of all title tags because they are too long.

Keep it under 60 characters to avoid truncation. Include your primary keyword near the beginning. Make it compelling—this is your headline in search results. Each page needs a unique title; do not duplicate across pages.

2. Meta Description: Does It Encourage Clicks?

Meta descriptions do not directly affect rankings but influence click-through rates, which is a strong indirect ranking signal. A compelling description turns a search impression into an actual visitor to your site.

Stay under 160 characters. Include your keyword naturally. Focus on what the reader will get from clicking. Add a call to action if appropriate. Unique descriptions for each page—duplicate descriptions waste opportunities to differentiate your pages in search results.

3. URL Structure: Is It Clean and Descriptive?

URLs should be readable by humans and include relevant keywords. A clean URL tells both users and Google what the page is about before they even click.

Good: /blog/on-page-seo-checklist. Bad: /blog/post-id-12847. Use hyphens between words. Keep URLs short but descriptive. See our URL structure guide for detailed best practices.

4. H1 Tag: Is There Exactly One?

Each page needs exactly one H1 tag, typically matching or closely related to your title. The H1 tells Google and users the primary topic of the page—multiple H1s dilute that signal.

Include your primary keyword. Make it descriptive and compelling. The H1 should clearly communicate the page's main topic at a glance. If a visitor reads only your H1, they should understand what the page covers.

5. Header Hierarchy: Are H2s and H3s Logical?

Headers structure content for readability and help Google understand your page organisation. A logical hierarchy makes your content scannable for both users and search engine crawlers.

Use H2s for main sections, H3s for subsections within those. Do not skip levels (H1 to H3 without H2). Include secondary keywords naturally in subheadings. Headers break up content and improve user experience—pages with clear headers keep visitors engaged longer.

6. Content Quality: Is It Genuinely Useful?

Content should thoroughly answer what searchers are looking for. According to Google's helpful content guidelines, pages should demonstrate expertise and provide substantial value to the reader.

Thin content will not rank. Ask yourself: would someone be satisfied finding this page, or would they return to search for something better? If you are covering a topic, cover it thoroughly. Our blog writing services help businesses create content that meets this standard.

7. Keyword Usage: Natural or Forced?

Include keywords naturally throughout your content. If it sounds awkward when read aloud, you are overdoing it—and Google's algorithms are increasingly good at detecting unnatural keyword usage.

Your primary keyword should appear in the title, H1, first paragraph, and naturally throughout the body. Related terms and synonyms matter too—Google understands semantic relationships and actually prefers varied language over repetitive keyword use. Never sacrifice readability for keyword density.

8. Internal Links: Are You Connecting Related Pages?

Internal links help Google understand your site structure and spread ranking authority between pages. According to Ahrefs, pages with more internal links pointing to them tend to rank higher because Google interprets internal links as a signal of importance. They also guide visitors to related content, keeping them on your site longer.

Each page should link to 2–5 relevant internal pages. Use descriptive anchor text—"learn what SEO means" beats "click here." Link to your most important pages from multiple locations across your site. Our SEO fundamentals guide explains how internal linking distributes authority.

9. External Links: Are You Citing Quality Sources?

Linking to authoritative external sources signals that you have done your research and builds credibility with both users and search engines.

Reference official sources, research, and industry publications where relevant. It builds credibility and helps Google understand your content's context. Do not link to competitors' commercial pages, but educational resources and data sources are fair game and expected.

10. Images: Are They Optimised?

Images need alt text, compression, and descriptive file names. Unoptimised images are one of the most common causes of slow page loading, which directly hurts your rankings.

Every image needs alt text describing what it shows—important for accessibility and Google Image search. Compress images to reduce file size without visible quality loss. Use descriptive file names: "kitchen-renovation-falmouth.jpg" not "IMG_4521.jpg."

11. Page Speed: Does It Load Fast?

Slow pages hurt rankings and frustrate users. Google's Core Web Vitals—Largest Contentful Paint, First Input Delay, and Cumulative Layout Shift—are confirmed ranking factors that you should test on every important page.

Use PageSpeed Insights to check. Target above 50 on mobile at minimum, above 80 ideally. Common fixes include compressing images, enabling caching, and minimising JavaScript. Speed matters more on mobile where connections vary.

12. Mobile Experience: Does It Work on Phones?

Google uses mobile-first indexing, meaning your mobile experience determines your ranking ability. With 56.86% of UK web traffic from mobile according to SQ Magazine, this is non-negotiable.

Test on actual devices, not just browser resizing. Text should be readable without zooming. Buttons should be tappable with thumbs. Forms should be easy to complete. Content should never require horizontal scrolling. Our guide to website design and SEO covers mobile optimisation in detail.

13. Schema Markup: Have You Added Structured Data?

Schema helps Google understand your content and can enable rich results in search, such as star ratings, FAQ dropdowns, and business information panels that increase your click-through rate.

Local businesses should add LocalBusiness schema. Articles can use Article schema. Products get Product schema with reviews and pricing. Use Google's Rich Results Test to validate your markup.

14. Content Freshness: Is Information Current?

Outdated content can hurt rankings, especially for time-sensitive topics. Google prefers fresh, accurate content over stale information, and users quickly lose trust when they encounter outdated statistics or advice.

Review important pages annually at minimum. Update statistics, fix outdated advice, refresh examples. Add "Last updated" dates where relevant. This ongoing maintenance is part of why our SEO services include regular content audits.

15. Call to Action: Is the Next Step Clear?

Every page should guide visitors towards taking action. A clear next step improves both user experience and conversion rates—which are indirect SEO signals that Google factors into its ranking decisions.

What do you want visitors to do after reading? Contact you? Read another article? Make a purchase? Make the next step obvious. Clear calls to action improve user experience and conversion rates—both of which indirectly support your SEO.

Frequently Asked Questions

How long does it take to complete this checklist?

For a single page, allow 30 to 60 minutes to audit and fix issues. For a full website audit, plan for a few hours spread over a week. Prioritise your homepage and main service pages first, then work through blog posts and secondary pages.

Which checklist items have the biggest impact?

Title tags, content quality, and page speed typically deliver the most noticeable improvements. If you can only address three items, start with these. Title tags directly influence both rankings and click-through rates, content quality is the top ranking factor, and speed affects every visitor.

Do I need to check every item on every page?

Focus on your highest-value pages first—your homepage, main service pages, and top-traffic blog posts. These pages have the most ranking potential and traffic, so improvements there deliver the biggest returns. Apply the full checklist to new content as you create it.

How often should I re-audit my pages?

Quarterly for your most important pages. Annually for everything else. After any significant website update or redesign, run through the full checklist again. SEO is not a one-time task—ongoing maintenance keeps your pages competitive.

Can I automate any of these checks?

Yes. Tools like Screaming Frog can audit title tags, meta descriptions, headers, broken links, and image alt text across your entire site automatically. Google Search Console monitors indexing and technical issues continuously. Our free SEO tools guide covers which tools automate which checks.

What should I do after completing this checklist?

Monitor your results in Google Search Console for 8 to 12 weeks. Then move on to off-page SEO—building backlinks and citations. For broader guidance beyond individual pages, explore our SEO fundamentals guide or learn about free tools to audit your site.

For broader guidance beyond individual pages, explore our complete SEO fundamentals guide or learn about free tools to audit your site. If you are a Cornwall or Devon business, our guides to SEO in Cornwall and SEO in Devon show how to apply these principles with a local focus. If you want professional help, get in touch for a free conversation about your website.