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About this tool
Preview how a link will look as an X (Twitter) card and check the meta tags against the card spec for title, description and image limits.
Twitter Card Preview shows how a link will appear as an X (Twitter) card and checks the underlying meta tags against X's Cards markup reference. It applies the documented limits — twitter:card must be summary, summary_large_image, app or player; titles are cut at 70 characters and descriptions at 200; card images must be under 5 MB and no larger than 4096 px on a side. It is for developers, SEO specialists and marketers who want to see the card before a post goes out.
Open Twitter Card Preview on AltFTool — it loads instantly in your browser.
Paste your code or data sample into the workspace.
Pick the format, conversion, or analysis you need.
Copy the polished result straight back into your project.
Title, description, image dimension and file-size checks follow X's published card requirements.
When a twitter: tag is missing the tool reports which og: tag X will use instead.
One button copies a complete twitter: plus og: meta block with the values properly escaped.
70 characters for the title and 200 for the description — X truncates anything longer with an ellipsis. Aim for around 55-60 characters of title so the card reads cleanly on a narrow phone, where fewer characters are shown before wrapping.
For summary_large_image, use a 2:1 image at least 300 × 157 px — 1200 × 600 px is the common choice — and keep it under 5 MB. The small summary card crops to a square and needs at least 144 × 144 px. Neither card accepts an image larger than 4096 px on a side.
The usual causes are a missing or misspelled twitter:card tag, an image URL that is relative or served over plain HTTP rather than HTTPS, an unsupported format, or an image over the 5 MB limit. This tool flags each of those as a blocking issue rather than a warning.
Yes, keep both. X falls back to og:title, og:description and og:image when the matching twitter: tag is missing, and other platforms such as LinkedIn, WhatsApp and Slack read Open Graph only. The copy button here outputs both sets together.