Last Updated on April 24, 2026 by Becky Halls
Why Onpage SEO Matters
Let’s be real, if you want your website to rank well on Google, you can’t just throw up some content and hope for the best – you need an onpage SEO check! On-page SEO is the secret sauce that helps search engines understand what your site is all about. It’s all about optimizing your pages so they’re easy to read, easy to navigate, and packed with valuable information that keeps visitors engaged.
Think of an onpage SEO check as a routine health check-up for your website. It helps you spot weak spots; maybe your pages load too slowly, your meta tags are missing, or your internal links are a mess. Fixing these issues not only makes your site more search-engine friendly but also gives visitors a better experience. And let’s be honest, nobody sticks around on a slow, confusing site.
In this post, we’ll break down how to perform an onpage SEO check, with practical tips, easy-to-follow steps, and our favourite must-have tools. Ready to boost your rankings and get your site in top shape? Let’s go…
Step-by-Step Guide to Performing an Onpage SEO Check
1. Analyze Your Page Titles & Meta Descriptions
Your title tag is one of the most critical on-page SEO elements. It should be concise, keyword-rich, and compelling enough to drive clicks.
- Keep it under 60 characters.
- Use primary keywords naturally.
- Ensure it’s unique for each page.
Similarly, meta descriptions should:
- Stay within 155-160 characters.
- Be engaging and action-driven.
- Include target keywords.
2. Optimize Header Tags (H1, H2, H3)
Proper heading structure makes content easier to read and helps search engines understand the context. Best practices:
- H1 should include the main keyword and be used only once per page.
- H2 and H3 tags should structure content logically and include secondary keywords where relevant.
- Use headers to improve readability, not just for SEO.
- Consider using PageTest.ai to A/B test on-page elements such as your H2 and H3 headers and find which versions work best
3. Ensure Keyword Optimization
Keyword stuffing is a thing of the past. Instead, focus on:
- Primary keyword placement: Title, first 100 words, and headers.
- Semantic keywords & LSI: Supportive, related terms to improve relevance.
- Natural flow: Always prioritize readability and user experience.
4. Check for Internal & External Links
A well-structured linking strategy enhances site navigation and SEO.
- Internal links: Ensure your content links to relevant internal pages with descriptive anchor text.
- External links: Link to authoritative sources to build credibility.
- Avoid broken links and update outdated references.
5. Improve URL Structure
A clean and SEO-friendly URL structure is vital for both search engines and users.
- Keep URLs short and descriptive.
- Use hyphens (-) instead of underscores (_).
- Include your target keyword in the URL where relevant.
6. Optimize Image SEO
Images enhance engagement but can slow down your site if not optimized.
- Use compressed images (JPEG, PNG, or WebP format).
- Add descriptive alt text with relevant keywords.
- Implement lazy loading to improve load times.
- Set width and height: Add width and height to image tags to reduce CLS.
- Responsive images: Use srcset and sizes so browsers pick the right file.
- Modern formats: Serve WebP or AVIF where supported to cut bytes.
7. Ensure Mobile-Friendliness
With mobile-first indexing, a responsive website is a necessity.
- Test your site with a Mobile-Friendly Test – there are various online tools available to do this.
- Ensure buttons, text, and navigation work seamlessly on mobile devices.
- Improve Core Web Vitals for mobile users.
- Viewport: Add a meta viewport tag to match device width.
- Avoid interstitials: Avoid pop-ups that block content on mobile, per Google.
- Tap targets: Keep tap targets near 48 CSS px with clear spacing.
- Text size: Use a base font size near 16 px for readability.
8. Page Speed Optimization
A slow website kills SEO rankings. Improve speed by:
- Minimizing JavaScript & CSS files.
- Using a Content Delivery Network (CDN).
- Optimizing images & enabling browser caching.
- Core Web Vitals: Target LCP 2.5 s, INP 200 ms, CLS 0.1 or better.
- Measure: Use PageSpeed Insights, Lighthouse, and CrUX field data.
- Improve LCP: Preload the hero image and key fonts, then defer low-priority scripts.
- Protocols: Serve assets over HTTP/2 or HTTP/3 to improve delivery.
9. Fix Technical SEO Issues
A technical onpage SEO check should cover:
- Broken links & 404 errors.
- Redirects (301, 302) handling.
- Canonical tags to prevent duplicate content issues.
- XML sitemap & robots.txt file correctly configured.
- Structured data: Validate with Google’s Rich Results Test and fix issues.
- Format: Prefer JSON-LD and include types like BreadcrumbList, Article, and Product.
- Monitor: Use Search Console Enhancements reports to track coverage and issues.
10. Use Onpage SEO Tools
Several tools can help streamline the process:
- Google Search Console – Identify crawl errors and indexing issues.
- Ahrefs / SEMrush – Audit and analyze SEO factors.
- PageTest.ai – A/B test headlines and other key elements.
- Screaming Frog – Crawl your website for technical issues.
Final Thoughts
Performing an onpage SEO check is not a one-time task—it’s an ongoing process. By continuously monitoring and improving your on-page elements, you ensure your website remains search engine-friendly and user-optimized. Implement these steps, leverage SEO tools, and stay updated with search engine changes to maintain your competitive edge.
Looking for more SEO insights? Check out our on-page SEO checklist to ensure you’ve covered all the essentials!
