Personalized email images
Generate personalized email images via API
Render a unique hero image for every recipient — their name, plan, streak or progress baked into the picture — so your campaigns feel one-to-one instead of one-to-many.
100 renders / month free · no card · overage billed, never blockedA single template, rendered from your data
How it works
1
Template the email hero
Place the recipient name and personalised fields over your campaign artwork.
2
Render at send time
Call the API (or a signed URL) per recipient as your ESP composes each message.
3
Embed the image
Drop the signed URL into your email's <img> tag — it renders on open, no email-client tricks.
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_email_hero","modifications":{"name":"Sam","headline":"your table is ready"}}'Questions
Does this work with my email provider?
Yes — the personalised image is just a URL, so any ESP that supports merge fields in an <img> src can use it.
Won't per-recipient images be expensive?
Identical renders are cached and not re-billed, and overage is a published per-1,000 rate — predictable even for large sends.