Convert HTML, Markdown, and URLs to PDF. Built-in invoice & receipt templates.
-All conversion and template endpoints require an API key. Pass it using either method:
-Authorization: Bearer df_free_your_api_key_here-
Or use the X-API-Key header:
X-API-Key: df_free_your_api_key_here-
Get a free API key instantly — no credit card required:
-curl -X POST https://docfast.dev/v1/signup/free \
- -H "Content-Type: application/json" \
- -d '{"email": "you@example.com"}'
- Convert raw HTML (with optional CSS) to a PDF document.
- -| Field | Type | Description |
|---|---|---|
html required | string | HTML content to convert |
css | string | Additional CSS to inject |
format | string | Page size: A4 (default), Letter, Legal, A3 |
landscape | boolean | Landscape orientation (default: false) |
margin | object | {top, right, bottom, left} in CSS units (default: 20mm each) |
curl -X POST https://docfast.dev/v1/convert/html \
- -H "Authorization: Bearer YOUR_KEY" \
- -H "Content-Type: application/json" \
- -d '{
- "html": "<h1>Hello World</h1><p>Generated by DocFast.</p>",
- "css": "h1 { color: navy; }",
- "format": "A4"
- }' \
- -o output.pdf
-
- 200 OK — Returns the PDF as application/pdf binary stream.
html field
- 401 Invalid/missing API key
- 429 Rate limited
- Convert Markdown to a styled PDF with syntax highlighting for code blocks.
- -| Field | Type | Description |
|---|---|---|
markdown required | string | Markdown content |
css | string | Additional CSS to inject |
format | string | Page size (default: A4) |
landscape | boolean | Landscape orientation |
margin | object | Custom margins |
curl -X POST https://docfast.dev/v1/convert/markdown \
- -H "Authorization: Bearer YOUR_KEY" \
- -H "Content-Type: application/json" \
- -d '{
- "markdown": "# Monthly Report\n\n## Summary\n\nRevenue increased by **15%** this quarter.\n\n| Metric | Value |\n|--------|-------|\n| Users | 1,234 |\n| MRR | $5,670 |"
- }' \
- -o report.pdf
-
- 200 OK — Returns application/pdf.
markdown field
- 401 Invalid/missing API key
- Navigate to a URL and convert the rendered page to PDF. Supports JavaScript-rendered pages.
- -| Field | Type | Description |
|---|---|---|
url required | string | URL to convert (must start with http:// or https://) |
waitUntil | string | load (default), domcontentloaded, networkidle0, networkidle2 |
format | string | Page size (default: A4) |
landscape | boolean | Landscape orientation |
margin | object | Custom margins |
curl -X POST https://docfast.dev/v1/convert/url \
- -H "Authorization: Bearer YOUR_KEY" \
- -H "Content-Type: application/json" \
- -d '{
- "url": "https://example.com",
- "waitUntil": "networkidle0",
- "format": "Letter"
- }' \
- -o page.pdf
-
- 200 OK — Returns application/pdf.
List all available document templates with their field definitions.
- -curl https://docfast.dev/v1/templates \ - -H "Authorization: Bearer YOUR_KEY"- -
{
- "templates": [
- {
- "id": "invoice",
- "name": "Invoice",
- "description": "Professional invoice with line items, taxes, and payment details",
- "fields": [
- {"name": "invoiceNumber", "type": "string", "required": true},
- {"name": "date", "type": "string", "required": true},
- {"name": "from", "type": "object", "required": true, "description": "Sender: {name, address?, email?, phone?, vatId?}"},
- {"name": "to", "type": "object", "required": true, "description": "Recipient: {name, address?, email?, vatId?}"},
- {"name": "items", "type": "array", "required": true, "description": "Line items: [{description, quantity, unitPrice, taxRate?}]"},
- {"name": "currency", "type": "string", "required": false},
- {"name": "notes", "type": "string", "required": false},
- {"name": "paymentDetails", "type": "string", "required": false}
- ]
- },
- {
- "id": "receipt",
- "name": "Receipt",
- "description": "Simple receipt for payments received",
- "fields": [ ... ]
- }
- ]
-}
- Render a template with your data and get a PDF. No HTML needed — just pass structured data.
- -| Param | Description |
|---|---|
:id | Template ID (invoice or receipt) |
| Field | Type | Description |
|---|---|---|
data required | object | Template data (see field definitions from /v1/templates) |
curl -X POST https://docfast.dev/v1/templates/invoice/render \
- -H "Authorization: Bearer YOUR_KEY" \
- -H "Content-Type: application/json" \
- -d '{
- "data": {
- "invoiceNumber": "INV-2026-001",
- "date": "2026-02-14",
- "dueDate": "2026-03-14",
- "from": {
- "name": "Acme Corp",
- "address": "123 Main St, Vienna",
- "email": "billing@acme.com",
- "vatId": "ATU12345678"
- },
- "to": {
- "name": "Client Inc",
- "address": "456 Oak Ave, Berlin",
- "email": "accounts@client.com"
- },
- "items": [
- {"description": "Web Development", "quantity": 40, "unitPrice": 95, "taxRate": 20},
- {"description": "Hosting (monthly)", "quantity": 1, "unitPrice": 29}
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