Which tags does X need?

Only twitter:card is essential. For the title, description and image, X uses twitter:title, twitter:description and twitter:image when they exist and falls back to the Open Graph tags when they do not. So a page with good Open Graph tags often just needs twitter:card added.

What size should a Twitter card image be?

For summary_large_image, a 2:1 image: 1200 × 600 pixels works well, and the minimum is 300 × 157. For the small summary card, a square of at least 144 × 144. Keep it under 5 MB, in JPG, PNG, WEBP or GIF; SVG is not supported.

Why is my card not updating on X?

X caches each URL’s card for about seven days. Links posted before your fix keep the old card until the cache expires; adding a harmless query string such as ?v=2 makes X treat it as a new URL.

Free tool · SERP & metadata

X (Twitter) Card Validator

Preview the card X will draw for your link, check the image size and tags, and copy the exact tags to add.

No sign-up. We read the live page for you. Nothing is stored.

Updated 21 October 2026

In the output

What you get

A preview of the card X will draw
Image size, measured in your browser
Missing or invalid twitter: tags
The exact tags to paste into your <head>

twitter:card is present and a type X recognises, since it decides whether the large-image layout is used at all.
The title and description X will use, after its fallback from twitter: tags to Open Graph to the page itself, against X’s length limits.
The image’s real size and shape, measured in your browser, against X’s minimums for summary and large-image cards, plus format and https.
That robots.txt lets Twitterbot fetch the page and the image, because a blocked crawler means no card at all.

Three steps

How to use the X (Twitter) Card Validator

Enter the page URL

The page you are about to share. We read its tags and its robots.txt.

Check the preview and the rows marked Fix

The preview is drawn from the same tags X reads, in the same order.

Paste the suggested tags

Only the tags that are missing are listed, with placeholders to replace. Then check again.

Why it matters

Why check your card before you post

X retired its own preview.

The Card Validator stopped showing previews in 2022. The only other way to see your card is to post the link and look.

One missing tag changes the layout.

Without twitter:card set to summary_large_image, a link can show as a small thumbnail or plain text, however good the image is.

Images have hard limits.

Too small, the wrong shape, an SVG, or a URL that will not load, and X drops the image without saying why.

Cards are cached.

X keeps a card for about a week. A mistake posted today stays on that link until the cache expires.

After you run it

What to do with the result

A share card is the first impression of a link, and on X a missing tag or a wrong-sized image turns it into plain text. Checking before you post costs a minute; fixing after costs a week of cache. Site Audit checks share tags across every page it crawls, and its page audit suggests the missing tags and builds a share image for you.

Site Audit

Frequently asked questions

X still hosts cards-dev.twitter.com/validator, but since 2022 it no longer shows a preview, only a log. This tool draws the preview from the same tags X reads.

Same cluster

More free tools

SERP Snippet Preview

See how your title and description render in Google results, and where they get cut off.

Open Graph Checker

See how your page looks when it is shared on LinkedIn, X, Facebook and Slack, and get the tags to fix it.

Sitemap URL Extractor

Pull every URL out of an XML sitemap, sitemap index or gzipped file, then filter, copy or download them.

See where you actually stand.

A free tool checks one thing once. Veritas watches all of it, continuously, across every engine that decides whether you get cited.

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