Templates: blog, launch, changelog, docs
Same query params on preview and paid URLs. color is the accent hex (default #C45C26). Author and date are omitted when empty — we do not invent them.
blog
https://cardurl.dev/preview/blog.png?title=Why+we+moved+our+docs+to+one+repo&author=Sam+Rivera&date=Oct+17%2C+2026&site=Atlas
Hosted URL, same params, no PREVIEW stamp. Needs an active trial or subscription; unpaid keys 404.
https://cardurl.dev/og/<siteKey>/blog?title=Why+we+moved+our+docs+to+one+repo&author=Sam+Rivera&date=Oct+17%2C+2026&site=Atlas
Params this template reads: title, subtitle (only when set), author, date (one byline, only when set), site (bottom-right, default cardurl), label (top label, shown in uppercase, default Blog), color.
launch
https://cardurl.dev/preview/launch.png?title=Atlas+Checklist+is+live&subtitle=Shared+checklists+for+small+teams&product=Atlas+Checklist
Hosted URL, same params, no PREVIEW stamp. Needs an active trial or subscription; unpaid keys 404.
https://cardurl.dev/og/<siteKey>/launch?title=Atlas+Checklist+is+live&subtitle=Shared+checklists+for+small+teams&product=Atlas+Checklist
Params this template reads: title, subtitle (when omitted, default is Query-param 1200×630 PNGs on your site key.), label (pill, default Now live), product (bottom-left, default CardURL), color.
changelog
https://cardurl.dev/preview/changelog.png?title=Search+notes+is+live&version=2.3.0&date=Oct+17%2C+2026&product=Atlas
Hosted URL, same params, no PREVIEW stamp. Needs an active trial or subscription; unpaid keys 404.
https://cardurl.dev/og/<siteKey>/changelog?title=Search+notes+is+live&version=2.3.0&date=Oct+17%2C+2026&product=Atlas
Params this template reads: title, version (pill, shown as v plus the version with a leading v stripped, default 1.0.0), date (only when set), subtitle (only when set), product (top line, default CardURL), label (bottom line, default Changelog), color.
docs
https://cardurl.dev/preview/docs.png?title=Connect+your+domain§ion=Getting+started&product=Atlas
Hosted URL, same params, no PREVIEW stamp. Needs an active trial or subscription; unpaid keys 404.
https://cardurl.dev/og/<siteKey>/docs?title=Connect+your+domain§ion=Getting+started&product=Atlas
Params this template reads: title, section (crumb product / section; default section is Getting started), subtitle (only when set), product (crumb and bottom-right, default Docs), label (bottom-left, default Docs), color.
Limits: title 160, subtitle 160, author 80, date 40, version 20, section 40, site, product, and label 40 characters. Longer values are cut. color is a 6-digit hex accent, default #C45C26; other values use that default.
The free preview is watermarked with a PREVIEW stamp and needs no signup; the hosted /og/ URL has no stamp and is $39/mo after a 7-day trial; Try your title in the preview, or edit title= in any preview URL above and open it.