Open Graph & social images
Generate Open Graph images with an API
Auto-render a unique social share image for every page, post and product — from one template and your data. No design tool, no screenshots, no stale cards.
100 renders / month free · no card · overage billed, never blockedA single template, rendered from your data
How it works
1
Design the card once
Lay out the title, description, author and background as a reusable template in the editor.
2
Pass your page data
Send the title and any fields to the API — or drop them in a signed render-by-URL straight in your og:image tag.
3
Cache & serve
Identical requests return the cached image and aren't re-billed, so high-traffic pages stay free to share.
One API call
curl https://api.mostlyrender.com/v1/renders \
-H "Authorization: Bearer mr_test_YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{"templateId":"tpl_og_card","modifications":{"title":"Ship a render API that never cuts you off","subtitle":"Templates · overage billing · real free tier"}}'Questions
Can I render the OG image straight from a URL?
Yes — a signed render-by-URL lets you put the data in the query string of your og:image tag, with no backend code at all.
Are repeated renders re-billed?
No. The same template + data returns a cached image and doesn't count again, so a viral post doesn't run up your meter.