The Complete On-Page SEO Checklist for 2026
On-page SEO is the foundation every ranking is built on. Here's every element to check and optimise on every page you want to rank.
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What on-page SEO actually covers
On-page SEO refers to every optimisation you make directly on a page - titles, headings, content, images, internal links, and structured data. Unlike off-page SEO (backlinks), you have full control over all of it. Getting on-page right is the prerequisite for rankings; no amount of link building rescues a page with broken fundamentals.
Title and meta tags
- Meta title - unique, under 60 characters, primary keyword near the start. See the full meta title guide.
- Meta description - under 160 characters, includes a benefit-driven sentence and soft CTA. Not a direct ranking factor but drives click-through rate.
- No duplicate titles - every page needs a unique title. Duplicates split authority and confuse Google.
Heading structure
- One H1 per page - contains the primary keyword, matches the page's core topic.
- H2s for main sections - use keyword variations and related terms. Google reads headings as strong topical signals.
- H3s for sub-sections - break down complex H2s. Don't skip heading levels (no jumping from H2 to H4).
Content quality signals
- Minimum depth - for competitive keywords, top results average 1,200–2,000 words. Match or exceed the depth of what's already ranking.
- Keyword placement - primary keyword in the first 100 words, H1, at least two H2s, and the conclusion.
- Semantic keywords - cover related terms and synonyms naturally. Google uses these to confirm topical relevance.
- No keyword stuffing - if the keyword appears more than once every 150 words on average, it reads as spam.
- Original insights - add data, case studies, examples, or your own perspective. Content that adds nothing new to what already exists ranks poorly after Google's helpful content updates.
URL structure
- Short, descriptive URLs - /on-page-seo-checklist not /blog/post?id=1234
- Primary keyword in the URL slug
- Hyphens between words, not underscores
- Avoid changing URLs after a page is indexed - always set up 301 redirects if you must
Images and media
- Descriptive alt text - every image should have alt text that describes the image and ideally includes a keyword where natural.
- File names - rename images before uploading. seo-audit-checklist.webp beats IMG_4521.jpg.
- Format and size - use WebP or AVIF, keep images under 200KB. Heavy images are the leading cause of slow LCP scores. See our page speed guide.
- Width and height attributes - always set these to prevent layout shift (CLS).
Internal links and structured data
- At least 3–5 internal links per page, using keyword-rich anchor text - see the full internal linking strategy.
- Canonical tag set to the correct URL to prevent duplicate content issues.
- Schema markup where relevant - Article schema for blog posts, FAQ schema for FAQ sections, SoftwareApplication schema for product pages.
Run a Seops audit to check every item on this list automatically across all your key pages. It flags missing titles, thin content, broken internal links, slow load times, and more - then prioritises what to fix first.