# X (Twitter) card validator alternative

> X reads twitter: tags first and falls back to Open Graph. X retired its official Card Validator preview, so you need another way to check cards.

Check a URL: https://sharelint.pages.dev/?url=<your-url>, or as Markdown: https://sharelint.pages.dev/api/preview?format=md&url=<your-url>

## Tags X (Twitter) reads (fallback order)

- Card type: `twitter:card`
- Title: `twitter:title` -> `og:title`
- Description: `twitter:description` -> `og:description`
- Image: `twitter:image` -> `og:image`

## Image requirements

- Recommended: 1200×628 for summary_large_image, 400×400 for summary
- Minimum: 300×157 (large) or 144×144 (summary)
- Maximum weight: 5 MB
- Formats: JPEG, PNG, GIF, WebP

## Card layout

summary_large_image shows a full-width image with the title overlaid and “From domain” underneath. summary shows a square thumbnail beside the text.

## Refreshing the cache

There is no public refresh. Cards are cached for about a week, so change the URL (for example ?v=2) to force a new fetch.

## Common problems

- Small card instead of a large image: set twitter:card to summary_large_image.
- No card: robots.txt blocks Twitterbot, or the image is over 5 MB.

Rule confidence: documented.