Free professional SEO tools — SERP preview, meta analyser, schema generator, robots.txt tester, and more. No login required.
The three most important meta tags for SEO are: (1) Title tag — the strongest on-page ranking signal and the clickable headline in search results; (2) Meta description — not a ranking factor but critically affects click-through rate; (3) Meta robots — controls whether pages are indexed and links followed. Open Graph and Twitter Card tags don't affect Google rankings but improve social media click-through rates. The canonical tag prevents duplicate content penalties.
The meta keywords tag is completely ignored by Google and Bing — it has had zero ranking value since 2009. The title tag remains a strong ranking signal. The meta description influences CTR rather than rankings directly. Focus your keyword efforts on the title tag (primary keyword near the front), H1 heading, and natural use throughout the page body text.
Both are meta tag sets that control how your page appears when shared on social media. Open Graph (og:) was created by Facebook and is used by Facebook, LinkedIn, Pinterest and many other platforms. Twitter Card (twitter:) is Twitter/X's proprietary format. If Open Graph tags are present and Twitter Card tags are missing, most platforms fall back to the OG data. Best practice is to implement both.
A canonical tag (rel='canonical') tells search engines which URL is the 'master' version of a page when multiple URLs serve similar or identical content. Use it when: you have paginated content, product pages with URL parameters, HTTP and HTTPS versions of the same page, or content syndicated on multiple URLs. Set the canonical to the URL you want indexed. Missing canonicals on duplicate content can dilute ranking signals.