Email header

Open each newsletter with a branded banner that names the edition and the main story.

File types: PNGJPEGWebP
Size: 1200 × 400 px
Use case: Email
Licence: Free to copy and use in your own templates
Source: Made by thirds.ai with the open-licence Space Grotesk font, original graphic marks, and fictional sample names.

email-header/template.html

About this design

What you can make with it.

Publishers use this at the top of a newsletter or product email. It names the edition next to a headline and a short supporting line. Change the edition, the headline, and the supporting line for every email.

Your details

What you can change.

These are the words and numbers you swap for your own. The design stays the same.

BrandA short text.
EditionA short text.
HeadlineA short text.
SublineA short text.
LogoA short text.

{
  "brand": "Meridian Supply",
  "edition": "Monthly digest · September 2026",
  "headline": "Three small changes that make your next launch simpler",
  "subline": "Five minutes of reading, with steps you can use this week."
}

For developers

Make this file from your code or your AI tools.

Save your copy once, then send the new details with each request. Each finished file costs 1 credit.

curl https://thirds.ai/v1/image \
  -H "Authorization: Bearer $THIRDS_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: email-header-1" \
  -d '{"template_id":"tpl_your_copy","version":1,"data":{"brand":"Meridian Supply","edition":"Monthly digest · September 2026","headline":"Three small changes that make your next launch simpler","subline":"Five minutes of reading, with steps you can use this week."},"image":{"format":"png","width":1200,"height":400}}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "render",
    "arguments": {
      "output": "png",
      "idempotency_key": "email-header-1",
      "request": {
        "template_id": "tpl_your_copy",
        "version": 1,
        "data": {
          "brand": "Meridian Supply",
          "edition": "Monthly digest · September 2026",
          "headline": "Three small changes that make your next launch simpler",
          "subline": "Five minutes of reading, with steps you can use this week."
        },
        "image": {
          "width": 1200,
          "height": 400
        }
      }
    }
  }
}