One big number with what it means and where it comes from.
This is a real render from the API with the example values below, at 1200×630.
For research reports, annual reviews and data posts: the number fills half the frame in a gradient, the explanation sits next to it and the source goes in the footer. Long numbers shrink instead of wrapping.
Every field is optional. Long text shrinks to fit instead of overflowing; an image field takes a public URL that we fetch on our side.
| Field | Type | Description | Example |
|---|---|---|---|
value |
text | The number, e.g. 87%. Long numbers shrink to fit. default: 100% | 87% |
label |
text | What the number means. | of links shared on LinkedIn get more clicks with a custom preview image |
source |
text | Where the number comes from. | Source: State of Social Previews 2026 |
eyebrow |
text | Short label above the title. | Research |
site |
text | Your domain or a short URL. | northwind.dev/report |
logo |
image URL | Publisher logo. | https://example.com/images/logo-northwind.png |
accent |
colour | Brand colour as hex, e.g. #6366f1. Drives buttons, highlights and the background glow. default: #f97316 | #f97316 |
theme |
dark | light | Colour scheme: dark or light. | — |
Use the slug as template. The response holds the URL of the finished PNG; ?wait=true keeps the connection open until it is ready.
curl -X POST "https://imageapi.benchkithq.com/v1/images?wait=true" \
-H "Authorization: Bearer sk_live_YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{
"template": "stat-highlight",
"modifications": {
"value": "87%",
"label": "of links shared on LinkedIn get more clicks with a custom preview image",
"source": "Source: State of Social Previews 2026",
"eyebrow": "Research",
"site": "northwind.dev/report",
"logo": "https://example.com/images/logo-northwind.png"
}
}'
For static sites, Webflow, Shopify and no-code tools: put the fields in the query string and sign it with your signing secret. The first request renders the image, every later one is a redirect to the cached file. How to compute the signature.
<meta property="og:image" content="https://imageapi.benchkithq.com/i/acc_YOUR_ACCOUNT_ID/stat-highlight.png?eyebrow=Research&label=of%20links%20shared%20on%20LinkedIn%20get%20more%20clicks%20with%20a%20custom%20preview%20image&site=northwind.dev%2Freport&source=Source%3A%20State%20of%20Social%20Previews%202026&value=87%25&s=YOUR_SIGNATURE">
accent and theme change per request. For anything more, copy the template into your account: you get an ordinary HTML template with the same fields that you can edit in the dashboard or through the API. If the slug is free on your account, the copy takes it — your integrations switch to your version without changing a line.
curl -X POST "https://imageapi.benchkithq.com/v1/templates/library/stat-highlight/copy" \
-H "Authorization: Bearer sk_live_YOUR_KEY"
Blog post
Job posting
Event
Podcast episode
Changelog / release
Documentation page
Real estate listing
Product card
Product on sale
Course lesson
Recipe
Newsletter issue
Quote card
Case study / testimonial
GitHub repository
Feature announcement
Profile / author card
Comparison (A vs B)