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OG Image Generator
Render a 1200×630 share card locally, preview it on each platform, and copy the meta tags.
Tool Panel
About OG Image Generator
Renders a 1200×630 share card locally, previews it inside X, Facebook, LinkedIn and Slack card layouts, and emits the twelve og / twitter tags.
- 1
Renders a **1200×630** share card in the browser (the Open Graph standard size): in text mode the title wraps to at most three lines and **breaks CJK per character**, so a space-less paragraph cannot overflow the canvas; upload mode fits an image and centre-crops it.
- 2
It shows **previews for X, Facebook, LinkedIn and Slack** plus ready-to-use meta tags (one `og:*` set and one `twitter:*` set), so a card that looks fine locally does not get half cropped when shared.
- 3
Everything is rendered locally with canvas — nothing is uploaded — and the download is a 1200×630 PNG. You can also copy just the tags without generating an image.
- 1
Choose text or upload mode
Text mode takes a title, description, site name and URL; upload mode scales the image to fill and centre-crops it.
- 2
Set the theme and accent
Dark and light backgrounds, with the accent colour used for the brand fragment of the title.
- 3
Compare previews, copy tags, download the PNG
Upload the PNG first to get an absolute URL, then point `og:image` at it.
Yes: a crawler has no page context when it fetches the image, so **a relative path cannot resolve**. Use an absolute address such as `https://yourdomain/og.png`. The order is therefore: generate and upload the image, get its URL, then paste it into the tag.
Platforms **cache** what they fetched. Rename the file or add a version parameter (`og.png?v=2`) to force a refetch. Keep the important content centred as well: each platform crops to its own ratio (a Slack unfurl is squarer than 1.91:1), so edges can disappear — which is exactly why four previews are shown here.
The tool does not emit it. It helps screen readers and describes the image when it fails to load, so add a line by hand if you want it: `<meta property="og:image:alt" content="…" />`. Also mind the file size: most platforms stop fetching somewhere around 5–8MB.
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