# 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 `<head>` of your HTML. At minimum, set `twitter:card` and an image; everything else has sensible fallbacks via Open Graph.

`<!-- Required -->
<meta name="twitter:card" content="summary_large_image" />

<!-- Strongly recommended -->
<meta name="twitter:title" content="Your post title (≤ 70 chars)" />
<meta name="twitter:description" content="A compelling summary (≤ 200 chars)" />
<meta name="twitter:image" content="https://example.com/preview.jpg" />
<meta name="twitter:image:alt" content="Descriptive alt text for accessibility" />

<!-- Optional but useful -->
<meta name="twitter:site" content="@yourbrand" />
<meta name="twitter:creator" content="@author" />

<!-- Open Graph fallbacks (X uses these if twitter:* missing) -->
<meta property="og:title" content="Your post title" />
<meta property="og:description" content="A compelling summary" />
<meta property="og:image" content="https://example.com/preview.jpg" />
<meta property="og:url" content="https://example.com/this-page" />
<meta property="og:type" content="article" />`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 how your link renders as a Twitter Card on X, with a full table of detected tags and character counts. Free validator, no signup.

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?▾A Twitter Card (now called X Card after the 2023 rebrand) is the rich preview that unfurls when you share a URL on X. There are four types: summary, summary_large_image, player, app, controlled by the twitter:card meta tag in your page head.Why isn't my Twitter Card showing on X?▾The five most common causes: (1) twitter:image is missing or broken, (2) the image is below minimum size (144x144 summary, 300x157 large image), (3) robots.txt is blocking the Twitterbot crawler, (4) X cached an old version (no manual refresh since cards-dev.x.com was retired), or (5) your URL redirects and X is caching the wrong target. Validate first, then share.What size should Twitter Card images be?▾For summary_large_image, use 1200x628px (1.91:1 ratio), the same as Facebook OG. For summary cards, use at least 144x144px (1:1 recommended). Max file size 5MB for static, 15MB for GIF. JPG, PNG, WEBP, and GIF supported. Always serve over HTTPS. X silently rejects http:// images.What's the difference between summary and summary_large_image?▾Summary shows a small square thumbnail (144x144 minimum) on the left of the title and description: compact, best for link aggregators. summary_large_image shows a large hero image (1200x628) above the title and description: best for blogs, articles, and product pages. Most modern sites use summary_large_image because it drives 2-3x higher click-through.Can I force X to refresh a cached Twitter Card?▾No. X removed the manual refresh feature when they shut down cards-dev.x.com. Card cache typically clears in 7 days. Workarounds: append ?v=2 to the URL when re-sharing, share from a verified/paid account (sometimes triggers re-crawl), or wait it out. Always validate tags before the very first share.Do I need both Twitter Card tags and Open Graph tags?▾No, X falls back to Open Graph (og:title, og:description, og:image) when twitter:* tags are missing. If your OG tags are well-configured, X will use them. Adding twitter:* tags is useful when you want a different image, title, or description specifically for X (versus Facebook/LinkedIn). At minimum, set twitter:card so X knows which layout to render.Is X's official Twitter Card validator still working?▾No. The cards-dev.x.com (formerly cards-dev.twitter.com) validator was deprecated when Twitter became X in 2023. It returns errors, shows a login wall, or fails to render previews. X has not released a public replacement. This tool fills the gap by parsing your meta tags and rendering a faithful card preview.What meta tags are required for Twitter Cards?▾Only twitter:card is strictly required (set to summary, summary_large_image, player, or app). Strongly recommended: twitter:title, twitter:description, twitter:image. Optional but useful: twitter:site (your @handle), twitter:creator (author @handle), twitter:image:alt (accessibility). If twitter:* tags are missing, X falls back to og:title, og:description, og:image.

## 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)Done with the tool? Now publish it everywhere.

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