---
title: OG Tag Validator — Preview Open Graph & Twitter Cards
url: https://varstatt.com/toolkit/og
description: Validate Open Graph and Twitter Card meta tags. Preview how links appear on Facebook, LinkedIn, and Twitter/X. Check missing tags.
section: Developer Toolkit (https://varstatt.com/toolkit)
tags: seo
related: OG Tags (https://varstatt.com/toolkit/og), Robots (https://varstatt.com/toolkit/robots), DNS (https://varstatt.com/toolkit/dns)
---
# OG Tag Validator

Validate Open Graph and Twitter Card meta tags. Preview how links appear on Facebook, LinkedIn, and Twitter/X. Check missing tags.

## How It Works

1. **Enter a URL** — Paste any public URL. The tool fetches the page and extracts all Open Graph and Twitter Card meta tags.
2. **Review validation results** — See which required tags are present or missing, with errors and warnings ranked by importance.
3. **Preview social cards** — Switch between Facebook/LinkedIn and Twitter/X previews to see exactly how your link will appear when shared.

## FAQ

### What meta tags does it check?

Open Graph tags (og:title, og:description, og:image, og:url, og:type, og:site_name, og:locale), Twitter Card tags (twitter:card, twitter:title, twitter:description, twitter:image, twitter:site, twitter:creator), plus page title, meta description, canonical URL, and favicon.

### Why doesn't the preview match what I see on Twitter/Facebook?

Social platforms cache OG data aggressively. This tool fetches fresh HTML every time, so you see the current state. Platforms may show an older cached version until their cache expires or you manually purge it.

### Can I check pages behind authentication?

No. The tool fetches the URL from the server, so it can only access publicly available pages — same as how social platform crawlers work.

### What's the difference between og: and twitter: tags?

Open Graph (og:) tags are the universal standard used by Facebook, LinkedIn, Slack, and others. Twitter Card (twitter:) tags are Twitter/X-specific — if missing, Twitter falls back to og: tags. Having both gives you the most control.

### Why is my og:image not showing?

Common causes: the image URL is relative (must be absolute), the image is behind authentication, or the image dimensions are too small. Facebook recommends 1200x630px. Check that the URL works when opened directly in a browser. Need to check your domain's DNS setup too? Use the [DNS Lookup tool](https://varstatt.com/toolkit/dns-lookup).

## Usage

This tool runs entirely in the browser — visit the URL above to use it.

## Related Tools

- [OG Tags](https://varstatt.com/toolkit/og)
- [Robots](https://varstatt.com/toolkit/robots)
- [DNS](https://varstatt.com/toolkit/dns)