Twitter Card validator. Preview unboxed.

Q: What card types does Twitter support?

Four types remain: summary (small square thumbnail, the default), summary_large_image (banner-style image, recommended for most articles + product pages), app (App Store / Play Store linking — has site-specific fields), and player (audio/video embed). Pick summary_large_image for editorial content; the larger image gets ~2x more engagement than the summary card. The validator flags non-standard card types.

Q: Will OG tags work if twitter:* is missing?

Yes — partially. X (formerly Twitter) falls back to og:title, og:description, and og:image when the corresponding twitter:title, twitter:description, twitter:image tags are absent. The card type itself (twitter:card) has no OG equivalent and defaults to summary if missing. Best practice: ship both OG and twitter:* tags so platforms render the optimal card; avoid duplicating identical content (use twitter:* only for X-specific overrides).

Q: What are the image size requirements?

summary_large_image: minimum 300x157, recommended 1200x628 (16:8.5 aspect), max 5MB. summary: minimum 144x144, recommended 400x400 (1:1 aspect). Both PNG, JPG, WebP, GIF accepted. WebP renders fine but some older clients still fall back to JPG; ship both as if needed. The validator can't fetch your image to check dimensions but flags missing twitter:image.

Q: Why isn't my card showing on X?

Three common causes. (1) Cache: X caches card metadata for 7 days; use the X Card Validator to force a refresh. (2) URL must be publicly accessible — staging/auth-walled URLs don't render. (3) Image must load via HTTPS (HTTP-only images get rejected). Less common: redirect chains break the parser, or your CDN serves the image with wrong Content-Type header.

Q: Should twitter:site differ from twitter:creator?

Yes. twitter:site is the publisher's X account (your brand handle). twitter:creator is the author's X account (the person who wrote the article). On a multi-author publication, twitter:site stays constant while twitter:creator varies per article. On a single-author site / brand-published content, both fields can hold the brand handle.

Paste your page HTML. Extracts every twitter:* meta tag, validates card type, title (≤70), description (≤200), and image dimensions. Falls back to OG tags where Twitter is missing — the same logic X actually uses.

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Paste your page HTML. The tool extracts every <meta name="twitter:*"> tag, validates card type, lengths, and image presence. Falls back to OG tags where Twitter-specific tags are missing — the actual X parser logic.

Paste page HTML *

card extracted · live

Sources used by this validator

X (Twitter) card spec
Open Graph protocol — fallback chain when twitter:* is missing.
summary_large_image gets ~2x engagement vs summary per X internal data.

Privacy: HTML parsed in-browser only.

§ 02 · questions

Six questions users ask.

What card types does Twitter support?

Four types: summary (small square thumbnail, default), summary_large_image (banner — recommended for editorial), app (App Store linking), player (audio/video embed). summary_large_image gets ~2x engagement vs summary.

Will OG tags work if twitter:* is missing?

Yes — partially. X falls back to og:title, og:description, og:image when twitter:* are absent. The card type itself defaults to summary. Ship both OG and twitter:* tags.

What are the image size requirements?

summary_large_image: 300x157 minimum, 1200x628 recommended, 5MB max. summary: 144x144 minimum, 400x400 recommended.

Why isn't my card showing on X?

Three common causes. Cache: X caches metadata for 7 days. URL must be publicly accessible. Image must load via HTTPS.

Should twitter:site differ from twitter:creator?

Yes. twitter:site is the publisher's handle (brand). twitter:creator is the author's handle (person). Multi-author sites vary creator per article.

Does this tool log my HTML?

No. The form runs entirely in JavaScript on your device. Nothing is sent to Digital Heroes servers.

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