Website Optimization Checklist: 21 Technical SEO Fixes Your Audit Tool Should Catch (But Many Don't)

Every website owner wants to rank higher on Google. Yet most skip the one step that makes the biggest difference: running a thorough website optimization checklist. A proper checklist does more than flag missing meta tags. It uncovers crawl errors, speed bottlenecks, broken links, and dozens of hidden issues that quietly drag your rankings down. Unfortunately, many free SEO checkers only scratch the surface. This guide covers all 21 technical fixes a truly modern audit tool should catch — and shows you exactly how to prioritize them for maximum impact.

Why Your Website Optimization Checklist Matters More Than Ever

Google processes over 8.5 billion searches per day. Competition for the top spots is fierce. Consequently, even small technical errors can cost you significant organic traffic. A structured checklist turns a vague "my site needs work" feeling into a clear, scored action plan. Moreover, it helps you prioritize fixes by impact rather than guessing where to start.

Tools like SEOjama's free SEO audit score your site across 20+ on-page factors and deliver prioritized recommendations. However, not all tools go deep enough. The 21 items below represent the full scope of what a best-in-class audit should cover.

The Complete Website Optimization Checklist: All 21 Fixes

1. HTTPS and SSL Certificate Status

Why it matters: Google confirmed HTTPS as a ranking signal back in 2014. Yet many sites still serve pages over HTTP or have expired SSL certificates. Additionally, mixed-content warnings (HTTP assets on an HTTPS page) can trigger browser security alerts. Your audit tool should flag every insecure URL, not just the homepage. Furthermore, it should check certificate expiry dates and warn you before they lapse.

• Check all pages are served over HTTPS
• Verify SSL certificate is valid and not expiring within 30 days
• Scan for mixed-content warnings on each page
• Confirm HTTP URLs redirect permanently (301) to HTTPS

2. XML Sitemap Presence and Validity

An XML sitemap tells search engines which pages to crawl. However, many sites have sitemaps that list 404 pages, noindex URLs, or outdated entries. Consequently, Google wastes crawl budget on dead ends. Your audit tool should validate the sitemap, check it is submitted in Google Search Console, and confirm it only lists canonical, indexable URLs.

3. Robots.txt Configuration

A misconfigured robots.txt file can accidentally block Google from crawling your entire site. Specifically, a single stray "Disallow: /" rule can de-index everything overnight. Your checker should parse the robots.txt, flag any rules that block important pages, and confirm it does not disallow CSS or JavaScript files that Google needs to render your pages correctly.

4. Crawl Errors and Blocked Resources

Crawl errors prevent search engines from accessing your content. Therefore, your audit tool should simulate a crawl and report all 4xx and 5xx status codes. Moreover, it should identify pages blocked by robots.txt or noindex tags that receive internal links — a common oversight that wastes link equity.

• 404 Not Found pages receiving internal links
• 500 Server Error pages
• Pages blocked by robots.txt but linked internally
• Soft 404s (pages that return 200 but show "not found" content)

5. Page Speed and Core Web Vitals

Core Web Vitals — LCP, INP, and CLS — are official Google ranking factors. According to Google's Web Vitals documentation, pages that score "Good" on all three metrics tend to rank significantly higher. However, most basic SEO checkers report only a generic speed score. A proper audit tool should break down each Core Web Vital, identify the specific elements causing slowness, and give actionable fixes like image compression or render-blocking script removal.

6. Mobile-Friendliness and Responsive Design

Google uses mobile-first indexing for all websites. Therefore, if your mobile experience is broken, your rankings will suffer — even on desktop searches. Your audit tool should test every key page template for mobile usability issues. Specifically, it should flag tap targets that are too small, content wider than the screen, and font sizes that require zooming.

7. Duplicate Content Detection

Duplicate content confuses search engines and splits ranking signals across multiple URLs. For instance, example.com/page and example.com/page/ are often treated as two separate pages. Additionally, HTTP and HTTPS versions, www and non-www variants, and URL parameters can all create duplicates. Your checklist tool should detect all these cases and recommend canonical tags or 301 redirects to consolidate them.

• WWW vs. non-WWW duplicates
• HTTP vs. HTTPS duplicates
• Trailing slash vs. no trailing slash
• URL parameter duplicates (e.g. ?sort=, ?ref=)
• Paginated pages without canonical tags

8. Canonical Tag Implementation

Canonical tags tell Google which version of a page is the "master" copy. However, incorrect canonicals — pointing to redirected URLs, noindex pages, or themselves in a chain — can silently harm your SEO. A strong audit tool checks that every canonical tag points to a valid, indexable, live URL. Furthermore, it should flag self-referencing canonicals that are missing on key pages.

9. Title Tag Optimization

Title tags are one of the most important on-page SEO elements. Yet many sites have titles that are too long, too short, duplicated across pages, or missing entirely. Your audit tool should check every page for title tag presence, length (ideally 50–60 characters), uniqueness, and keyword inclusion. Moreover, it should flag titles that Google is likely to rewrite based on recent search quality guidelines.

10. Meta Description Coverage

Meta descriptions do not directly affect rankings. However, they heavily influence click-through rates from search results. Consequently, missing or duplicate meta descriptions are a real lost opportunity. Your website optimization checklist tool should report every page missing a meta description, every duplicate, and every description exceeding 160 characters. Additionally, it should highlight pages where the description matches the title — a common sign of auto-generation gone wrong.

11. Header Tag Structure (H1–H6)

A clear heading hierarchy helps both users and search engines understand your content. Specifically, every page should have exactly one H1 tag containing the primary keyword. Additionally, H2 and H3 tags should organize the content logically. Your audit tool should flag pages with missing H1s, multiple H1s, or heading structures that skip levels (e.g., jumping from H1 to H4).

12. Image Alt Text and File Optimization

Images without alt text are invisible to search engines and inaccessible to screen readers. Furthermore, oversized images are one of the top causes of slow page load times. A proper audit should flag every image missing alt text, every alt text that is stuffed with keywords, and every image file that exceeds a reasonable size threshold. Moreover, it should check for modern formats like WebP and AVIF that dramatically reduce file sizes.

• Missing alt attributes
• Alt text over 125 characters
• Images larger than 200KB without compression
• Images not served in next-gen formats (WebP, AVIF)

13. Internal Linking Structure

Internal links distribute "link equity" across your site and help search engines discover new pages. However, many sites have orphan pages — pages with no internal links pointing to them. Consequently, these pages may never get crawled or ranked. Your audit tool should map your internal link graph, identify orphan pages, flag pages with too few internal links, and highlight broken internal links.

14. Broken Links (Internal and External)

Broken links create a poor user experience and waste crawl budget. Additionally, linking to a 404 page signals poor site maintenance to Google. A thorough audit crawls every link on every page and reports all broken destinations. Furthermore, it should differentiate between broken internal links (which you can fix directly) and broken external links (which require finding replacement sources).

15. Structured Data and Schema Markup

Structured data helps Google understand your content and can unlock rich results like star ratings, FAQs, and product prices in search snippets. According to Schema.org, there are hundreds of schema types available for different content categories. However, many sites implement schema incorrectly, with missing required properties or invalid syntax. Your audit tool should validate all schema markup and flag errors that prevent rich results from appearing.

• Missing required schema properties
• Invalid JSON-LD syntax
• Schema type mismatches (e.g., Article schema on a product page)
• Deprecated schema properties

16. URL Structure and Readability

Clean, descriptive URLs are easier for users to understand and share. Moreover, they give search engines a clear signal about page content. Your checklist should flag URLs that are too long, contain unnecessary parameters, use uppercase letters, or include special characters. Specifically, URLs with dynamic parameters like ?id=12345&session=abc should be replaced with static, keyword-rich alternatives.

17. Redirect Chains and Loops

A redirect chain occurs when URL A redirects to URL B, which then redirects to URL C. Consequently, each hop in the chain dilutes link equity and slows page load time. Redirect loops — where a URL eventually redirects back to itself — can make pages completely inaccessible. Your audit tool should trace every redirect path, flag chains longer than one hop, and identify any loops.

18. Hreflang Tags for Multilingual Sites

If your site targets multiple languages or regions, hreflang tags tell Google which version to show to which audience. However, hreflang is notoriously easy to implement incorrectly. For instance, missing return tags (each language version must reference all others) are a very common error. Your audit tool should validate the full hreflang implementation across all language variants.

19. Page Depth and Crawl Budget

Pages buried more than three clicks from the homepage are harder for search engines to discover and rank. Additionally, large sites with thousands of pages need to manage crawl budget carefully. Your website optimization checklist tool should calculate the click depth of every page and flag any important content that is too deep in the site architecture. Furthermore, it should identify pages that consume crawl budget without providing SEO value.

20. Thin and Low-Quality Content Pages

Pages with very little content — under 300 words — often fail to satisfy user intent and can drag down your overall site quality score. Specifically, Google's Helpful Content system evaluates content quality at a site-wide level. Therefore, a cluster of thin pages can hurt even your best-performing pages. Your audit tool should flag all thin content pages and recommend either expanding, consolidating, or noindexing them.

21. Website SEO Score and Prioritized Recommendations

The final — and perhaps most important — element of a great audit is a clear, prioritized website SEO score. Raw data without context is overwhelming. Consequently, the best tools translate findings into a scored report where the highest-impact fixes are listed first. SEOjama's website SEO score does exactly this — it scores your site across 20+ factors and ranks recommendations by their potential ranking impact, so you always know what to fix first.

• Overall site health score (0–100)
• Issues grouped by severity: Critical, Warning, and Notice
• Estimated ranking impact for each fix
• Page-level scores for individual audit reports

How to Use This Website Optimization Checklist Effectively

Running through 21 items manually is time-consuming. Therefore, the smartest approach is to use a dedicated audit tool that automates the scanning and scoring process. Start by fixing all critical issues first — these are the ones most likely to block crawling or cause ranking drops. Then work through warnings and notices in order of impact. Moreover, re-run your audit after every major site change to catch regressions early.

For a fully automated approach, SEOjama's SEO recommendations engine crawls your entire site, scores every page individually, and delivers a prioritized action plan — all without manual effort. Get started today and see your website SEO score in minutes.

Final Thoughts

A generic checklist won't cut it in today's competitive search landscape. You need a tool that catches all 21 of these technical issues, scores them by severity, and tells you exactly what to fix first. Furthermore, the best audit tools update their checks as Google's algorithm evolves — so your site stays optimized over time. Run a free SEO audit on SEOjama right now and discover which of these 21 fixes your site needs most. Discover what's holding your rankings back — your competitors already have.