Branded invoices

Every invoice on brand, from one template.

Design the invoice once. After that, send the client name, the items, and the total, and get back a clean PDF with your logo, colours, and fonts. It works the same for one invoice a month or a thousand a day.

Copy the invoice templateRead the data guide

One credit per finished invoice
Failed renders cost nothing
25 free credits every month

Invoice NS-1042 from Northline Studio to Fieldnote Labs, one A4 page with two items and a total of $3,900 — client-invoice.pdf, made from the gallery template and sample data

Send the data

Your app sends the numbers. We send back the PDF.

Save the invoice template once and keep its ID. Each request carries only the data for one invoice. The idempotency key keeps a retry from making a second copy.

curl --fail-with-body --silent --show-error https://thirds.ai/v1/pdf \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: invoice-NS-1042' \
  --data '{
    "template_id": "tpl_YOUR_INVOICE_TEMPLATE",
    "version": 1,
    "data": {
      "business_name": "Northline Studio",
      "business_email": "hello@northline.example",
      "client_name": "Fieldnote Labs",
      "client_email": "accounts@fieldnote.example",
      "invoice_number": "NS-1042",
      "issued_on": "2026-09-03",
      "items": [
        { "description": "Product launch design", "amount": 2400 },
        { "description": "Campaign image set", "amount": 850 }
      ],
      "subtotal": 3250,
      "tax": 650,
      "total": 3900,
      "payment_terms": "Due within 14 days",
      "payment_note": "Bank transfer to the account on this invoice"
    },
    "pdf": { "format": "A4" }
  }'

The finished invoice NS-1042 as the API returns it, with a blue header, two items, and a total of $3,900

This is the real output of the request beside it, made by the API from the client invoice gallery template.

How it works

Three steps from data to invoice.

Copy a template
Start from the client invoice in the gallery, or paste your own HTML. Both are free.
Add your brand
Pick your brand kit. The logo, colours, and fonts drop into the template's brand fields.
Send each invoice
Post the data from your app or type it in the editor, then download the PDF.

The data fields

Plain fields, so your app can fill them.

The invoice template reads a small JSON object. The editor shows every field on the Data tab, and the data guide explains lists, totals, and dates.

Business and client names, emails, and the invoice number.
A list of items, each with a description and an amount.
Subtotal, tax, total, payment terms, and a payment note.

The client invoice open in the editor with the Data tab showing the business, client, items, and total fields

Good to know

What an invoice costs and how long we keep it.

Cost: One credit per finished PDF
Failed renders: Free, and safe to retry
Page size: A4 by default, Letter or custom on request
File kept: 30 days, then download your own copy
Template versions: Every saved version stays fixed
Brand kit: One kit applies to every invoice

The credit sum

A month of invoices, worked out.

Copying the template and adding your brand kit are free. Each finished invoice costs one credit, and a failed render costs nothing.

Copy the invoice template0
Apply your brand kit0
100 invoices this month100

Total100 credits

The free plan gives 25 credits a month. The $10 pack holds 1,500 credits, enough for 15 months at this rate.

Related templates

More templates for quotes, receipts, and packing slips.

Packing slip with sample text in an editable layout

Orders

Questions

Before you send the first one.

Can I change the template later without breaking old invoices?: Yes. Each save makes a new version, and old versions stay fixed. Point your app at a version number, or use latest and we record the exact version on every render.
How do I get told when the PDF is ready?: Wait on the request, poll the job, or add a webhook. The webhook posts a signed message to your server with the download link.
Can I make invoices by hand too?: Yes. Open the template in the editor, type the values on the Data tab, and export. The same template serves your app and your team.

Go deeper

Everything for invoices.

Start now

Send your first invoice today.

Copy the template, add your brand, and export. The free plan includes 25 credits every month.

Copy the invoice templateBuy credits from $10

Every invoice on brand, from one template.

Your app sends the numbers. We send back the PDF.

Three steps from data to invoice.

Copy a template

Add your brand

Send each invoice