API is live Free tier available No credit card required

PDF Invoices via API.
One call. Done.

Generate professional, pixel-perfect PDF invoices with a single POST request. No templates to manage. No rendering headaches. Works with any language.

curl -X POST https://documint.anethoth.com/api/v1/invoice \ -H "Authorization: Bearer dm_your_key" \ -H "Content-Type: application/json" \ -d '{"invoice_number": "INV-001", "from": {"name": "Acme Corp"}, "to": {"name": "Client Inc"}, "items": [{"description": "Consulting", "quantity": 10, "unit_price": 150}], "tax_rate": 10}' \ -o invoice.pdf
import requests response = requests.post( "https://documint.anethoth.com/api/v1/invoice", headers={"Authorization": "Bearer dm_your_key"}, json={ "invoice_number": "INV-001", "from": {"name": "Acme Corp"}, "to": {"name": "Client Inc"}, "items": [{"description": "Consulting", "quantity": 10, "unit_price": 150}], "tax_rate": 10 } ) with open("invoice.pdf", "wb") as f: f.write(response.content)
const response = await fetch("https://documint.anethoth.com/api/v1/invoice", { method: "POST", headers: { "Authorization": "Bearer dm_your_key", "Content-Type": "application/json" }, body: JSON.stringify({ invoice_number: "INV-001", from: { name: "Acme Corp" }, to: { name: "Client Inc" }, items: [{ description: "Consulting", quantity: 10, unit_price: 150 }], tax_rate: 10 }) }); const pdf = await response.arrayBuffer(); fs.writeFileSync("invoice.pdf", Buffer.from(pdf));
body := `{"invoice_number":"INV-001", "from":{"name":"Acme Corp"}, "to":{"name":"Client Inc"}, "items":[{"description":"Consulting","quantity":10,"unit_price":150}], "tax_rate":10}` req, _ := http.NewRequest("POST", "https://documint.anethoth.com/api/v1/invoice", strings.NewReader(body)) req.Header.Set("Authorization", "Bearer dm_your_key") req.Header.Set("Content-Type", "application/json") resp, _ := http.DefaultClient.Do(req) pdf, _ := io.ReadAll(resp.Body) os.WriteFile("invoice.pdf", pdf, 0644)
$response = file_get_contents( "https://documint.anethoth.com/api/v1/invoice", false, stream_context_create(["http" => [ "method" => "POST", "header" => "Authorization: Bearer dm_your_key\r\n" . "Content-Type: application/json\r\n", "content" => json_encode([ "invoice_number" => "INV-001", "from" => ["name" => "Acme Corp"], "to" => ["name" => "Client Inc"], "items" => [["description" => "Consulting", "quantity" => 10, "unit_price" => 150]], "tax_rate" => 10 ]) ]]) ); file_put_contents("invoice.pdf", $response);

How It Works

1

Get an API Key

Sign up with your email. No credit card needed. Get your key instantly.

2

Send Invoice JSON

POST your invoice data — items, addresses, tax, notes — in a simple JSON format.

3

Get a PDF Back

Receive a professionally formatted PDF invoice. Ready to email, download, or store.

Built for Developers

One API Call

Send JSON, get a PDF. No SDKs to install, no templates to manage. Works with any language or framework.

🎨

Beautiful by Default

Professional invoice design out of the box. Clean typography, proper alignment, ready to send to clients.

🔒

Tax & Currency Support

Automatic tax calculations, any currency symbol, discounts, and notes. Everything for compliant invoices.

🚀

Sub-Second Generation

PDFs generated server-side with WeasyPrint. No browser rendering, no Puppeteer. Fast and reliable.

🛠

OpenAPI / Swagger Docs

Full interactive API docs at /docs. Test endpoints directly from your browser.

💰

Generous Free Tier

5 invoices/month free, forever. No credit card required. Upgrade only when you need more volume.

Try It Live

Edit the JSON below and generate a real PDF invoice — no API key needed for this demo.

Simple, Transparent Pricing

Start free. Scale as you grow. No hidden fees.

Free

$0/mo
5 invoices / month
  • Full API access
  • PDF generation
  • Tax calculations
  • All currency symbols
Get Started

Pro

$19/mo
$0.019 per invoice
1,000 invoices / month
  • Everything in Starter
  • Custom logo on invoices
  • Webhook notifications
  • Priority support
Get Started

Business

$39/mo
$0.0039 per invoice
10,000 invoices / month
  • Everything in Pro
  • Custom templates
  • Dedicated support
  • SLA guarantee
Get Started

Get Your API Key in 10 Seconds

Start generating invoices immediately. No credit card required.

FAQ

What formats can I send invoice data in?
Send a JSON object with your invoice details: from/to addresses, line items (description, quantity, unit_price), optional tax rate, currency symbol, notes, and more. See our API docs for the full schema.
What does the PDF look like?
Professional, clean invoices with proper typography, alignment, and branding. Includes itemized table, tax calculations, totals, and optional notes/footer. Try the live demo above to see a real example.
Can I add my company logo?
Yes! Pass a logo_url field in your JSON and it will appear in the invoice header. Available on Pro plan and above.
How fast is PDF generation?
Most invoices are generated in under 500ms. We use server-side rendering (WeasyPrint), not browser-based rendering, so it's fast and consistent.
Do you store my invoice data?
We store minimal metadata for usage tracking. The full invoice JSON is stored temporarily for debugging but can be deleted on request. PDFs are generated on-the-fly and not stored.
Can I use this in production?
Absolutely. DocuMint is designed for production use. The API is versioned (v1), responses include proper error codes, and we monitor uptime 24/7.

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