On-page SEO is everything a search engine reads directly from your page's HTML. Get it right and you make it easy for Google to understand and rank you; get it wrong and even great content underperforms. Here's the checklist we use, in priority order, with what "good" looks like for each.
The single highest-impact on-page element. Every page needs a unique <title> that includes its primary keyword, ideally 10–60 characters. Too short wastes the slot; too long gets truncated in results.
Doesn't directly rank you, but it's your ad copy in the search results and drives click-through. Aim for 50–160 characters, one per page, written for a human.
Exactly one <h1> per page describing the main topic, with <h2>s structuring the rest. Multiple H1s or none at all is a common, fixable mistake.
A <link rel="canonical"> tells search engines the preferred URL and prevents duplicate-content dilution. Missing canonicals are one of the most overlooked issues.
<html lang> — helps language targeting.noindex'd.OG tags control how your page looks when shared on social and in chat apps. No OG tags means an ugly, low-CTR preview.
Images need descriptive alt attributes (accessibility + image search), and thin pages (under ~300 words) struggle to rank for competitive terms.
Our free-to-try Website SEO & Tech Auditor fetches any page and reports title/meta/heading/canonical/OG analysis, image-alt and content checks, detected tech stack, and an on-page score with a clear issue list — no signup.
Run the SEO Auditor →Auditing one page is easy by hand; auditing hundreds (a migration, a client portfolio, a competitor set) is where automation pays off. Both the auditor above and our Contact Details Extractor run as plain APIs — and as agent tools via Apify MCP — so you can wire them into a bot or a spreadsheet without managing infrastructure.