An invoice generator for freelancers, contractors, and small businesses that works inside the chat.
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Use this when the user wants to make or generate an invoice, invoice template, bill, quote, estimate, receipt, or credit note as a downloadable PDF (invoice generator for freelancers, contractors, and small businesses), including 'how do I make an invoice for this work' once the work, client, and prices are known. Computes exact totals: per-line rounding to the currency's minor units (round half up), line and document discounts before tax, tax/VAT/GST summary grouped by rate, shipping, deposits and balance due; supports any ISO 4217 currency (JPY has no decimals). Returns totals plus PDF (A4 or Letter) and CSV download links. Does not email invoices to clients, track payments, process card payments, or give tax advice; the user supplies tax rates. Do not use to fabricate receipts for purchases that did not happen.
Line items, at least one, at most 200. Example: [{"description": "Design work", "quantity": 12, "unit": "hrs", "unit_price": 85}].
Optional note printed at the bottom, e.g. 'Thank you for your business.'
PDF paper size. Defaults to letter for US/Canada locales and A4 elsewhere.
Who receives the document: the client or customer.
Optional BCP 47 locale for number and date formats, e.g. en-US, en-GB, de-DE, pl-PL. Labels stay in English. Defaults to English for the currency's country.
Document number exactly as it should appear, e.g. INV-0042. If omitted, one is derived from the issue date.
Who issues the document: the user's business or freelance name, address, email, optional tax ID.
ISO 4217 currency code, e.g. USD, EUR, GBP, PLN, JPY. Defaults to USD. Minor units follow ISO 4217 (JPY has none, KWD has 3).
Payment due date (or valid-until date for quotes and estimates) as YYYY-MM-DD, e.g. 2026-10-16.
Optional shipping or delivery charge, e.g. 15.
Optional purchase order or project reference, e.g. PO-7781. For credit notes, the original invoice number.
Name of the tax shown on the document, e.g. VAT, GST, Sales tax. Defaults to Tax.
Issue date as YYYY-MM-DD, e.g. 2026-10-02. Defaults to today (UTC).
Amount already paid (deposit or partial payment), shown as a balance due, e.g. 500. Receipts default to the full total.
Optional brand accent colour as hex, e.g. #1D4ED8. Defaults to #0E7C66.
Kind of document: invoice (default), quote, estimate, receipt (records a payment already received), or credit_note (refund or correction of an earlier invoice).
Set true to print the total in English words, e.g. 'One thousand twenty and 00/100 USD'.
Optional fixed discount on the whole document before tax, e.g. 50. Use either this or discount_percent.
Optional discount on the whole document in percent, applied to the subtotal before tax, e.g. 10.
Tax rate in percent applied to shipping, e.g. 20. Defaults to 0 (shipping not taxed).
Alternative to due_date: days after the issue date, e.g. 14 for 'Net 14' or 30 for 'Net 30'. 0 means due on receipt.
Optional free-text payment details from the user, e.g. bank name, IBAN, SWIFT, or a payment link. Never a card number.
Use this when the user wants to make or generate an invoice, invoice template, bill, quote, estimate, receipt, or credit note as a downloadable PDF (invoice generator for freelancers, contractors, and small businesses), including 'how do I make an invoice for this work' once the work, client, and prices are known. Computes exact totals: per-line rounding to the currency's minor units (round half up), line and document discounts before tax, tax/VAT/GST summary grouped by rate, shipping, deposits and balance due; supports any ISO 4217 currency (JPY has no decimals). Returns totals plus PDF (A4 or Letter) and CSV download links. Does not email invoices to clients, track payments, process card payments, or give tax advice; the user supplies tax rates. Do not use to fabricate receipts for purchases that did not happen.
| Argument | Type | Description |
|---|---|---|
| items* | array | Line items, at least one, at most 200. Example: [{"description": "Design work", "quantity": 12, "unit": "hrs", "unit_price": 85}]. |
| notes | string | Optional note printed at the bottom, e.g. 'Thank you for your business.' |
| paper | string | PDF paper size. Defaults to letter for US/Canada locales and A4 elsewhere. |
| client | object | Who receives the document: the client or customer. |
| locale | string | Optional BCP 47 locale for number and date formats, e.g. en-US, en-GB, de-DE, pl-PL. Labels stay in English. Defaults to English for the currency's country. |
| number | string | Document number exactly as it should appear, e.g. INV-0042. If omitted, one is derived from the issue date. |
| seller | object | Who issues the document: the user's business or freelance name, address, email, optional tax ID. |
| currency | string | ISO 4217 currency code, e.g. USD, EUR, GBP, PLN, JPY. Defaults to USD. Minor units follow ISO 4217 (JPY has none, KWD has 3). |
| due_date | string | Payment due date (or valid-until date for quotes and estimates) as YYYY-MM-DD, e.g. 2026-10-16. |
| shipping | number | Optional shipping or delivery charge, e.g. 15. |
| reference | string | Optional purchase order or project reference, e.g. PO-7781. For credit notes, the original invoice number. |
| tax_label | string | Name of the tax shown on the document, e.g. VAT, GST, Sales tax. Defaults to Tax. |
| issue_date | string | Issue date as YYYY-MM-DD, e.g. 2026-10-02. Defaults to today (UTC). |
| amount_paid | number | Amount already paid (deposit or partial payment), shown as a balance due, e.g. 500. Receipts default to the full total. |
| accent_color | string | Optional brand accent colour as hex, e.g. #1D4ED8. Defaults to #0E7C66. |
| document_type | string | Kind of document: invoice (default), quote, estimate, receipt (records a payment already received), or credit_note (refund or correction of an earlier invoice). |
| amount_in_words | boolean | Set true to print the total in English words, e.g. 'One thousand twenty and 00/100 USD'. |
| discount_amount | number | Optional fixed discount on the whole document before tax, e.g. 50. Use either this or discount_percent. |
| discount_percent | number | Optional discount on the whole document in percent, applied to the subtotal before tax, e.g. 10. |
| shipping_tax_rate | number | Tax rate in percent applied to shipping, e.g. 20. Defaults to 0 (shipping not taxed). |
| payment_terms_days | integer | Alternative to due_date: days after the issue date, e.g. 14 for 'Net 14' or 30 for 'Net 30'. 0 means due on receipt. |
| payment_instructions | string | Optional free-text payment details from the user, e.g. bank name, IBAN, SWIFT, or a payment link. Never a card number. |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"items"
],
"properties": {
"items": {
"type": "array",
"items": {
"type": "object",
"required": [
"description",
"unit_price"
],
"properties": {
"unit": {
"type": "string",
"maxLength": 12,
"description": "Optional unit label, e.g. hrs, pcs, days, kg."
},
"quantity": {
"type": "number",
"description": "Quantity, up to 4 decimals, e.g. 12 or 1.5. Defaults to 1."
},
"tax_rate": {
"type": "number",
"description": "Tax/VAT/GST rate for this line in percent, e.g. 23, 8, or 8.875. Defaults to 0."
},
"unit_price": {
"type": "number",
"description": "Price per unit before tax, in the document currency, e.g. 85 or 1499.99."
},
"description": {
"type": "string",
"maxLength": 300,
"description": "What was sold or done, e.g. 'Logo design' or 'Website maintenance, September'."
},
"discount_percent": {
"type": "number",
"description": "Optional line discount in percent, e.g. 10."
}
}
},
"maxItems": 200,
"description": "Line items, at least one, at most 200. Example: [{\"description\": \"Design work\", \"quantity\": 12, \"unit\": \"hrs\", \"unit_price\": 85}]."
},
"notes": {
"type": "string",
"maxLength": 1000,
"description": "Optional note printed at the bottom, e.g. 'Thank you for your business.'"
},
"paper": {
"enum": [
"a4",
"letter"
],
"type": "string",
"description": "PDF paper size. Defaults to letter for US/Canada locales and A4 elsewhere."
},
"client": {
"type": "object",
"properties": {
"name": {
"type": "string",
"maxLength": 100,
"description": "Client name, e.g. \"Acme Ltd\"."
},
"email": {
"type": "string",
"maxLength": 120,
"description": "Client email shown on the document, e.g. [email protected]."
},
"phone": {
"type": "string",
"maxLength": 40,
"description": "Client phone number, e.g. +1 415 555 0100."
},
"tax_id": {
"type": "string",
"maxLength": 40,
"description": "Client tax or VAT registration number if it must appear, e.g. PL5260001246 or GB123456789."
},
"address": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100
},
"maxItems": 6,
"description": "Client postal address, one line per entry, e.g. [\"1 Main Street, London EC1A 1AA\"]."
}
},
"description": "Who receives the document: the client or customer."
},
"locale": {
"type": "string",
"maxLength": 35,
"description": "Optional BCP 47 locale for number and date formats, e.g. en-US, en-GB, de-DE, pl-PL. Labels stay in English. Defaults to English for the currency's country."
},
"number": {
"type": "string",
"maxLength": 40,
"description": "Document number exactly as it should appear, e.g. INV-0042. If omitted, one is derived from the issue date."
},
"seller": {
"type": "object",
"properties": {
"name": {
"type": "string",
"maxLength": 100,
"description": "Seller (the user's business) name, e.g. \"Northwind Studio\"."
},
"email": {
"type": "string",
"maxLength": 120,
"description": "Seller (the user's business) email shown on the document, e.g. [email protected]."
},
"phone": {
"type": "string",
"maxLength": 40,
"description": "Seller (the user's business) phone number, e.g. +1 415 555 0100."
},
"tax_id": {
"type": "string",
"maxLength": 40,
"description": "Seller (the user's business) tax or VAT registration number if it must appear, e.g. PL5260001246 or GB123456789."
},
"address": {
"type": "array",
"items": {
"type": "string",
"maxLength": 100
},
"maxItems": 6,
"description": "Seller (the user's business) postal address, one line per entry, e.g. [\"200 Market St, San Francisco, CA 94105\"]."
}
},
"description": "Who issues the document: the user's business or freelance name, address, email, optional tax ID."
},
"currency": {
"type": "string",
"maxLength": 8,
"description": "ISO 4217 currency code, e.g. USD, EUR, GBP, PLN, JPY. Defaults to USD. Minor units follow ISO 4217 (JPY has none, KWD has 3)."
},
"due_date": {
"type": "string",
"maxLength": 30,
"description": "Payment due date (or valid-until date for quotes and estimates) as YYYY-MM-DD, e.g. 2026-10-16."
},
"shipping": {
"type": "number",
"description": "Optional shipping or delivery charge, e.g. 15."
},
"reference": {
"type": "string",
"maxLength": 60,
"description": "Optional purchase order or project reference, e.g. PO-7781. For credit notes, the original invoice number."
},
"tax_label": {
"type": "string",
"maxLength": 24,
"description": "Name of the tax shown on the document, e.g. VAT, GST, Sales tax. Defaults to Tax."
},
"issue_date": {
"type": "string",
"maxLength": 30,
"description": "Issue date as YYYY-MM-DD, e.g. 2026-10-02. Defaults to today (UTC)."
},
"amount_paid": {
"type": "number",
"description": "Amount already paid (deposit or partial payment), shown as a balance due, e.g. 500. Receipts default to the full total."
},
"accent_color": {
"type": "string",
"maxLength": 7,
"description": "Optional brand accent colour as hex, e.g. #1D4ED8. Defaults to #0E7C66."
},
"document_type": {
"enum": [
"invoice",
"quote",
"estimate",
"receipt",
"credit_note"
],
"type": "string",
"description": "Kind of document: invoice (default), quote, estimate, receipt (records a payment already received), or credit_note (refund or correction of an earlier invoice)."
},
"amount_in_words": {
"type": "boolean",
"description": "Set true to print the total in English words, e.g. 'One thousand twenty and 00/100 USD'."
},
"discount_amount": {
"type": "number",
"description": "Optional fixed discount on the whole document before tax, e.g. 50. Use either this or discount_percent."
},
"discount_percent": {
"type": "number",
"description": "Optional discount on the whole document in percent, applied to the subtotal before tax, e.g. 10."
},
"shipping_tax_rate": {
"type": "number",
"description": "Tax rate in percent applied to shipping, e.g. 20. Defaults to 0 (shipping not taxed)."
},
"payment_terms_days": {
"type": "integer",
"maximum": 365,
"minimum": 0,
"description": "Alternative to due_date: days after the issue date, e.g. 14 for 'Net 14' or 30 for 'Net 30'. 0 means due on receipt."
},
"payment_instructions": {
"type": "string",
"maxLength": 600,
"description": "Optional free-text payment details from the user, e.g. bank name, IBAN, SWIFT, or a payment link. Never a card number."
}
}
}