> ## Documentation Index > Fetch the complete documentation index at: https://developers.zite.com/llms.txt > Use this file to discover all available pages before exploring further. # Generate PDFs > Render an HTML document to a hosted PDF — invoices, receipts, reports — from a backend workflow with ZitePdf.renderHtml. No setup or integration needed — call [`ZitePdf.renderHtml`](/framework/utilities#pdf-generation) from a backend [workflow](/framework/workflows) and you get back a permanent hosted URL to store, email, or return to the frontend. ## Worked example — an invoice ```typescript theme={null} // apps//src/api/generateInvoice.ts import { z } from 'zod'; import { createEndpoint } from 'zitejs/backend'; import { ZitePdf } from 'zitejs/pdf'; import { zite } from 'zitejs/db'; export default createEndpoint({ description: 'Render an invoice PDF and save its URL', inputSchema: z.object({ invoiceNumber: z.string(), customer: z.object({ name: z.string(), email: z.string() }), lineItems: z.array(z.object({ description: z.string(), quantity: z.number(), unitPrice: z.number(), })), }), outputSchema: z.object({ url: z.string() }), execute: async ({ input }) => { // Escape every user-controlled string you interpolate into the HTML. const esc = (s: unknown) => String(s).replace(/&/g, '&').replace(//g, '>').replace(/"/g, '"').replace(/'/g, '''); // Coerce numbers so NaN never reaches the document. const num = (n: unknown) => (Number.isFinite(Number(n)) ? Number(n) : 0); const total = input.lineItems.reduce((s, li) => s + num(li.quantity) * num(li.unitPrice), 0); const rows = input.lineItems.map(li => { const qty = num(li.quantity), unit = num(li.unitPrice); return ` ${esc(li.description)} ${qty} $${unit.toFixed(2)} $${(qty * unit).toFixed(2)} `; }).join(''); const html = `

Invoice #${esc(input.invoiceNumber)}

Bill to ${esc(input.customer.name)} · ${esc(input.customer.email)}
${new Date().toLocaleDateString()}

${rows}

Description	Qty	Unit	Amount
Total			$${total.toFixed(2)}

`; const { url } = await ZitePdf.renderHtml({ html, filename: `invoice-${input.invoiceNumber}.pdf` }); // Optional: keep the URL on a record so it shows up in the app. await zite.Invoices.create({ record: { pdfUrl: url, customerName: input.customer.name } }); return { url }; }, }); ``` `renderHtml` returns `{ url, filename }` — `url` is a permanent, public HTTPS download link. ## HTML authoring rules * **One self-contained document** — ``, a ``, one `