# Free Twitter Card Validator — Preview X Card Tags Live
**Source:** https://posteverywhere.ai/tools/twitter-card-validator
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# Free Twitter Card Validator
Preview how your URL renders as an X Card. Validate twitter:card, twitter:image, and OG fallback tags in one click.
X's official `cards-dev.x.com` validator is broken — this is a working replacement.
Enter URL to validateValidate Twitter Card
## What is a Twitter Card?
A **Twitter Card** (officially renamed to *X Card* after the 2023 rebrand, though most developers and SEO tools still call them Twitter Cards) is a rich media preview that displays when someone shares a URL on X / Twitter. Instead of a bare URL, your link unfurls into a styled card with an image, title, description, and domain — dramatically improving click-through rate.
There are four card types, controlled by the `twitter:card` meta tag:
- **summary** — small square thumbnail (144x144 min) beside the title and description. Best for short content and link aggregators.
- **summary_large_image** — large hero image (1200x628 recommended) above the title. The default for most blogs, articles, and product pages.
- **player** — embedded audio/video player. Requires HTTPS, an iframe URL, and approval from X via the developer portal.
- **app** — mobile app install card, deep-linking to iOS or Android app stores.
Most modern sites use `summary_large_image` because the larger visual real estate drives 2-3x higher click-through rates than the small `summary` card. If you're also publishing to other networks, our [free OG image checker](https://posteverywhere.ai/tools/free-og-image-checker) validates the Open Graph tags that Facebook, LinkedIn, and Slack use.
## Twitter Card Image Size Requirements 2026
Card typeMin sizeRecommendedAspect ratiosummary144x144400x4001:1summary_large_image300x1571200x6281.91:1player262x262640x6401:1appApp iconAutoN/A**Max file size:** 5MB for static JPG/PNG/WEBP, 15MB for animated GIF. All images must be served over HTTPS — http:// URLs are silently rejected by X. Need exact dimensions for every platform? Check our [2026 social media image sizes guide](https://posteverywhere.ai/tools/social-media-image-sizes), or resize an image to fit X's spec with our [X image resizer](https://posteverywhere.ai/tools/x-image-resizer).
## Twitter Card Meta Tag Reference
Drop these tags into the `` of your HTML. At minimum, set `twitter:card` and an image — everything else has sensible fallbacks via Open Graph.
`
`If you're writing X content regularly, save the boilerplate above as a snippet — and use our [X post generator](https://posteverywhere.ai/tools/x-post-generator) or [X thread maker](https://posteverywhere.ai/tools/x-thread-maker) to draft the copy that goes with each shared link.
## Why X's Official Validator Stopped Working
The official Twitter Card validator lived at `cards-dev.twitter.com/validator` for nearly a decade. After Twitter rebranded to X in 2023, the URL was redirected to `cards-dev.x.com` — but the tool itself was deprecated. Today it either returns errors, redirects you to a login wall, or fails to render previews even when your tags are perfect.
X has not released a replacement. They also removed the "preview card" feature from the X Developer Portal and the "Refresh card cache" option that used to let publishers force a re-crawl. The community has been complaining since 2023, but X has shown no signs of restoring the validator.
This free tool fills that gap. It parses your page's `twitter:*` and `og:*` meta tags server-side, applies X's documented fallback rules, and renders a faithful visual preview of both card layouts. If you're building a content workflow that publishes to multiple networks, our [social media scheduler](https://posteverywhere.ai/social-media-scheduler) previews every card and post before you hit publish.
## Troubleshooting Twitter Cards Not Showing
### 1. X cached an old preview
X cards typically cache for 7 days. There's no manual refresh since cards-dev was retired. Workaround: append `?v=2` to your URL when sharing, or wait it out. Always validate before first share.
### 2. Robots.txt is blocking Twitterbot
X uses a crawler called `Twitterbot` to fetch meta tags. If your robots.txt disallows it, no card will render. Check that your robots.txt allows Twitterbot user-agent or doesn't block `/` globally.
### 3. Image dimensions are wrong
Images below the minimum size (144x144 for summary, 300x157 for summary_large_image) are silently rejected. Files over 5MB fail too. Resize with our [X image resizer](https://posteverywhere.ai/tools/x-image-resizer) or use 1200x628 to stay safely within spec.
### 4. Meta tags are missing or malformed
Common mistakes: using `property="twitter:card"` instead of `name="twitter:card"`, omitting the `twitter:image` tag entirely, or pointing to a relative image URL. Always use absolute HTTPS URLs and the `name=` attribute for Twitter tags.
### 5. Your URL redirects and X is caching the wrong target
If example.com/page redirects to example.com/page/, X may have cached the meta tags from the redirect destination only. Make sure both URLs return identical meta tags, or set up a canonical that always resolves to the live page.
Need help managing the full publishing workflow? Our [X scheduler](https://posteverywhere.ai/x-scheduler) lets you preview every post — card included — and schedule across all your X accounts. Pair it with our [X bio generator](https://posteverywhere.ai/tools/x-bio-generator) if you're also optimising your profile.
### More Resources
X tools
- [X scheduler](https://posteverywhere.ai/x-scheduler)
- [X image resizer](https://posteverywhere.ai/tools/x-image-resizer)
- [X post generator](https://posteverywhere.ai/tools/x-post-generator)
- [X thread maker](https://posteverywhere.ai/tools/x-thread-maker)
- [X bio generator](https://posteverywhere.ai/tools/x-bio-generator)
Related validators
- [OG image checker](https://posteverywhere.ai/tools/free-og-image-checker)
- [Social media image sizes](https://posteverywhere.ai/tools/social-media-image-sizes)
- [Social media scheduler](https://posteverywhere.ai/social-media-scheduler)
- [Social media management guide](https://posteverywhere.ai/blog/social-media-management)
- [PostEverywhere pricing](https://posteverywhere.ai/pricing)
Official docs
- [X Cards documentation](https://developer.x.com/en/docs/twitter-for-websites/cards/overview/abouts-cards)
- [Open Graph protocol](https://ogp.me/)
- [Facebook sharing debugger](https://developers.facebook.com/tools/debug/)
## How to Use the Twitter Card Validator
1
### Paste your URL
Drop the full URL of any page (including https://). The tool fetches the live HTML and parses every twitter:* and og:* meta tag.
2
### Review the preview
See a faithful render of how the card will appear on X — summary or summary_large_image — plus a full table of detected tags and char counts.
3
### Fix the issues shown
Address any red errors or amber warnings, redeploy, and validate again. Cards usually update on X within 7 days (no manual refresh available).
## Twitter Card Validator FAQ
What is a Twitter Card?▾Why isn't my Twitter Card showing on X?▾What size should Twitter Card images be?▾What's the difference between summary and summary_large_image?▾Can I force X to refresh a cached Twitter Card?▾Do I need both Twitter Card tags and Open Graph tags?▾Is X's official Twitter Card validator still working?▾What meta tags are required for Twitter Cards?▾
## More Free Tools
[OG Image CheckerValidate Open Graph tags](https://posteverywhere.ai/tools/free-og-image-checker)[X Image ResizerResize for X spec](https://posteverywhere.ai/tools/x-image-resizer)[X Post GeneratorAI-write your posts](https://posteverywhere.ai/tools/x-post-generator)[Social Media Image SizesEvery dimension, every platform](https://posteverywhere.ai/tools/social-media-image-sizes)
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