Letterhead letter

Write a business letter on a letterhead with a logo and a signature line.

Original1 of 6

File types: PDF
Size: A4 PDF
Use case: Business letters
Licence: Free to copy and use in your own templates
Source: Made by thirds.ai with the open-licence Cormorant Garamond, Newsreader, and Great Vibes fonts, original graphic marks, and fictional sample names.

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.

Write formal letters on your own letterhead. The logo from your brand kit, company name, and contact details sit at the top, above the date, the recipient, a subject line, and the letter itself. Type a new letter and recipient each time.

Your details

What you can change.

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

Company nameA short text.
Company taglineA short text.
Company addressA short text.
Company phoneA short text.
Company emailA short text.
DateA short text.
Recipient nameA short text.
Recipient titleA short text.
Recipient addressA short text.
SubjectA short text.
GreetingA short text.
Paragraph 1A longer text with more than one line.
Paragraph 2A longer text with more than one line.
Paragraph 3A longer text with more than one line.
ClosingA short text.
Signer nameA short text.
Signer titleA short text.
FooterA longer text with more than one line.

{
  "company_name": "Fenwick Vane Architects",
  "company_tagline": "Chartered architecture studio",
  "company_address": "14 Tannery Court, Bristol BS1 5TY",
  "company_phone": "+44 117 203 4471",
  "company_email": "studio@fenwickvane.co.uk",
  "date": "2026-10-05",
  "recipient_name": "Mr Callum Reid",
  "recipient_title": "Development Director, Northbank Estates",
  "recipient_address": "22 Wharfside Row, Bristol BS1 6UX",
  "subject": "Planning proposal for the Wharfside Mill conversion",
  "greeting": "Dear Mr Reid,",
  "paragraph_1": "Thank you for showing us around the Wharfside Mill last week. We can see why you want to keep the character of the old brickwork while bringing the building up to a modern standard. The tall arched windows, the loading doors on the quay side and the cast-iron columns on the ground floor are all worth saving, and each one can do real work in the new plan.",
  "paragraph_2": "Our proposal keeps the original saw-tooth roofline and timber trusses as the centrepiece of the top-floor apartments. It reworks the ground floor for two retail units with a shared entrance court, and it opens the old hoist bay as a light well for the stairs. A full set of drawings, a phasing plan and a fixed fee are attached for your planning submission.",
  "paragraph_3": "We'd be glad to walk the committee through the drawings in person before you submit. Please let us know a date that suits you in the week of 9 November, and we will bring physical models of both floor plans and a sample board of the brick and timber. Until then, I'm happy to answer any questions by phone.",
  "closing": "Kind regards,",
  "signer_name": "Iris Fenwick",
  "signer_title": "Founding Partner, Fenwick Vane Architects",
  "footer": "Fenwick Vane Architects Ltd · Registered in England and Wales, company no. 09562147"
}

For developers

Make this file from your code or your AI tools.

Save your design once, then your code or AI tool sends the details and gets the finished file back. Each one costs 1 credit.

curl https://thirds.ai/v1/pdf \
  -H "Authorization: Bearer $THIRDS_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: letterhead-letter-1" \
  -d '{"template_id":"tpl_your_copy","version":1,"data":{"company_name":"Fenwick Vane Architects","company_tagline":"Chartered architecture studio","company_address":"14 Tannery Court, Bristol BS1 5TY","company_phone":"+44 117 203 4471","company_email":"studio@fenwickvane.co.uk","date":"2026-10-05","recipient_name":"Mr Callum Reid","recipient_title":"Development Director, Northbank Estates","recipient_address":"22 Wharfside Row, Bristol BS1 6UX","subject":"Planning proposal for the Wharfside Mill conversion","greeting":"Dear Mr Reid,","paragraph_1":"Thank you for showing us around the Wharfside Mill last week. We can see why you want to keep the character of the old brickwork while bringing the building up to a modern standard. The tall arched windows, the loading doors on the quay side and the cast-iron columns on the ground floor are all worth saving, and each one can do real work in the new plan.","paragraph_2":"Our proposal keeps the original saw-tooth roofline and timber trusses as the centrepiece of the top-floor apartments. It reworks the ground floor for two retail units with a shared entrance court, and it opens the old hoist bay as a light well for the stairs. A full set of drawings, a phasing plan and a fixed fee are attached for your planning submission.","paragraph_3":"We'"'"'d be glad to walk the committee through the drawings in person before you submit. Please let us know a date that suits you in the week of 9 November, and we will bring physical models of both floor plans and a sample board of the brick and timber. Until then, I'"'"'m happy to answer any questions by phone.","closing":"Kind regards,","signer_name":"Iris Fenwick","signer_title":"Founding Partner, Fenwick Vane Architects","footer":"Fenwick Vane Architects Ltd · Registered in England and Wales, company no. 09562147"}}'

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "render",
    "arguments": {
      "output": "pdf",
      "idempotency_key": "letterhead-letter-1",
      "request": {
        "template_id": "tpl_your_copy",
        "version": 1,
        "data": {
          "company_name": "Fenwick Vane Architects",
          "company_tagline": "Chartered architecture studio",
          "company_address": "14 Tannery Court, Bristol BS1 5TY",
          "company_phone": "+44 117 203 4471",
          "company_email": "studio@fenwickvane.co.uk",
          "date": "2026-10-05",
          "recipient_name": "Mr Callum Reid",
          "recipient_title": "Development Director, Northbank Estates",
          "recipient_address": "22 Wharfside Row, Bristol BS1 6UX",
          "subject": "Planning proposal for the Wharfside Mill conversion",
          "greeting": "Dear Mr Reid,",
          "paragraph_1": "Thank you for showing us around the Wharfside Mill last week. We can see why you want to keep the character of the old brickwork while bringing the building up to a modern standard. The tall arched windows, the loading doors on the quay side and the cast-iron columns on the ground floor are all worth saving, and each one can do real work in the new plan.",
          "paragraph_2": "Our proposal keeps the original saw-tooth roofline and timber trusses as the centrepiece of the top-floor apartments. It reworks the ground floor for two retail units with a shared entrance court, and it opens the old hoist bay as a light well for the stairs. A full set of drawings, a phasing plan and a fixed fee are attached for your planning submission.",
          "paragraph_3": "We'd be glad to walk the committee through the drawings in person before you submit. Please let us know a date that suits you in the week of 9 November, and we will bring physical models of both floor plans and a sample board of the brick and timber. Until then, I'm happy to answer any questions by phone.",
          "closing": "Kind regards,",
          "signer_name": "Iris Fenwick",
          "signer_title": "Founding Partner, Fenwick Vane Architects",
          "footer": "Fenwick Vane Architects Ltd · Registered in England and Wales, company no. 09562147"
        }
      }
    }
  }
}

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