Offers

Promo postcard

Send a printed postcard with a photo, a big offer, a code, and room for the address on the back.

A landscape postcard front with an orange-to-gold gradient, the headline The sea's still warm in October in dark rounded type, a round coast photo cut into sunset stripes, and a dark teal zigzag stamp that says 20% off. — Original1 of 6

File types: PDF
Size: 148 × 105 mm PDF
Use case: Offers
Licence: Free to copy and use in your own templates
Source: Made by thirds.ai with the open-licence Righteous font, original gradients and graphic shapes, fictional sample names, and an original AI-generated example photo.

Three brands

Give every client this design in their own brand.

Add a client's logo, colours, and fonts in one step, and you've got a file that looks made just for them, with no new design to build.

About this design

What you can make with it.

Mail your customers a postcard with an offer they can't miss. The front has a photo, a big headline, and your discount on a stamp, and the back has room for the address and your code. Change the offer for each season.

Your details

What you can change.

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

Brand nameA short text.
HeadlineA short text.
OfferA short text.
BodyA longer text with more than one line.
Address blockA longer text with more than one line.
CodeA short text.
Valid untilA short text.
ContactA short text.

{
  "brand_name": "Perranswell Surf School",
  "headline": "The sea's still warm in October",
  "offer": "20% off",
  "body": "Hi from the beach! Autumn is our favourite time to surf. The crowds have gone, the water is still 16°C, and the waves are the best of the year. Book any lesson before half term and we'll take 20% off.",
  "address_block": "Aisha and Tom Brennan\n27 Gwel an Mor\nNewquay\nTR7 3QF",
  "code": "WARMSEA20",
  "valid_until": "Book by Sun 1 Nov 2026",
  "contact": "01637 480 112 · perranswellsurf.co.uk"
}

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/pdf \
  -H "Authorization: Bearer $THIRDS_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: promo-postcard-1" \
  -d '{"template_id":"tpl_your_copy","version":1,"data":{"brand_name":"Perranswell Surf School","headline":"The sea'"'"'s still warm in October","offer":"20% off","body":"Hi from the beach! Autumn is our favourite time to surf. The crowds have gone, the water is still 16°C, and the waves are the best of the year. Book any lesson before half term and we'"'"'ll take 20% off.","address_block":"Aisha and Tom Brennan\n27 Gwel an Mor\nNewquay\nTR7 3QF","code":"WARMSEA20","valid_until":"Book by Sun 1 Nov 2026","contact":"01637 480 112 · perranswellsurf.co.uk"},"pdf":{"width":"148mm","height":"105mm"}}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "render",
    "arguments": {
      "output": "pdf",
      "idempotency_key": "promo-postcard-1",
      "request": {
        "template_id": "tpl_your_copy",
        "version": 1,
        "data": {
          "brand_name": "Perranswell Surf School",
          "headline": "The sea's still warm in October",
          "offer": "20% off",
          "body": "Hi from the beach! Autumn is our favourite time to surf. The crowds have gone, the water is still 16°C, and the waves are the best of the year. Book any lesson before half term and we'll take 20% off.",
          "address_block": "Aisha and Tom Brennan\n27 Gwel an Mor\nNewquay\nTR7 3QF",
          "code": "WARMSEA20",
          "valid_until": "Book by Sun 1 Nov 2026",
          "contact": "01637 480 112 · perranswellsurf.co.uk"
        },
        "pdf": {
          "width": "148mm",
          "height": "105mm"
        }
      }
    }
  }
}

Edit this template

Open it in the editor, change anything you like, and keep it with your own templates. Your first 50 credits each month are free.

Use this template

Try it with your details