How to use the open graph preview and checker
- Enter a public page URL and select Check tags, or switch to Paste tags and paste the page's HTML head.
- Review the required Open Graph tags (og:title, og:type, og:image, og:url) and any warnings.
- Compare the generic previews styled like common social platforms.
- Check the share image report: its real pixel size is measured in your browser.
- Use the missing tags list and the raw tag table to fix your page, then check again.
Worked example
A page with only basic tags
Checking https://example.com finds the title "Example Domain" and no Open Graph tags. The tool reports og:title, og:type, og:image and og:url as missing required tags, plus a missing meta description, twitter:card and canonical link. The previews show the page title with "No image", because nothing else was found.
How it works
In URL mode our server fetches the page with an SSRF-protected client (public addresses only, redirects re-checked, HTML only, 1.5 MB cap) and parses it with node-html-parser. In paste mode the same parser runs in your browser. The tool reads <title>, meta description, og:*, twitter:*, canonical and icon links, resolves relative URLs, and applies the usual fallbacks (for example twitter:title falls back to og:title). Values are never invented.
Assumptions
- Previews are approximations built only from tags found on the page. Each platform has its own layout, crops and caching.
Frequently asked questions
Is anything sent to your server?
In URL mode, only the URL you enter is sent; our server downloads that public page to read its tags and does not store the result. Paste mode runs entirely in your browser. In both modes your browser loads the share image directly from its host to measure it.
Why does a platform still show my old preview?
Social platforms cache link previews, sometimes for days. After fixing your tags, use the platform's own debugging or refresh tool to request a new scrape.
What size should og:image be?
1200×630 pixels (about 1.91:1) is the common recommendation. Images smaller than 600×314 may be shown as a small thumbnail, and below 200×200 many platforms ignore them.
Why can it not fetch my page?
Pages on private or local networks are blocked for security, and some sites block automated requests or need JavaScript to add their tags. Use Paste tags with the rendered HTML instead.
Limitations
- Pages that add meta tags with JavaScript after loading are read as served, without running scripts.
- Limited to 20 checks per 10 minutes per visitor.
- Card styles are generic approximations, not official renderings.