SwissQrBill

Swiss QR-bill generation library for Elixir, implementing the SIX QR-bill standard (v2.3).

Generates the complete payment part (Zahlteil) with receipt as PDF, SVG, or PNG — ready for printing or embedding in invoices.

Issues & Feedback

This library is developed at git.e9li.com and mirrored to GitHub. If you found a bug or have a suggestion, you can either:

• Open an issue on GitHub
• Send an email to rafael@e9li.com

Installation

Add swiss_qr_bill to your list of dependencies in mix.exs:

def deps do
  [
    {:swiss_qr_bill, "~> 0.1.1"}
  ]
end

System requirements

PDF output works out of the box. For SVG and PNG output, you need pdftocairo from the Poppler utilities:

• macOS:brew install poppler
• Ubuntu/Debian:apt install poppler-utils
• Alpine:apk add poppler-utils

Usage

Building a QR bill

# Create addresses
creditor = SwissQrBill.Address.new("Muster AG", "Bahnhofstrasse", "1", "8001", "Zürich", "CH")
debtor = SwissQrBill.Address.new("Max Muster", "Hauptstrasse", "42", "3000", "Bern", "CH")

# Address without street (minimal form)
creditor = SwissQrBill.Address.new("Muster AG", "8001", "Zürich", "CH")

# Generate a QR reference
{:ok, ref} = SwissQrBill.Reference.QrReferenceGenerator.generate("210000", "313947143000901")

# Build the bill
bill =
  SwissQrBill.new()
  |> SwissQrBill.set_creditor(creditor)
  |> SwissQrBill.set_creditor_information("CH44 3199 9123 0008 8901 2")
  |> SwissQrBill.set_payment_amount("CHF", 2500.25)
  |> SwissQrBill.set_debtor(debtor)
  |> SwissQrBill.set_payment_reference(:qrr, ref)
  |> SwissQrBill.set_additional_information("Invoice 2024-001")

Validation

{:ok, bill} = SwissQrBill.validate(bill)
# or
{:error, errors} = SwissQrBill.validate(invalid_bill)
# errors is a list of descriptive strings

Validates IBAN format, QR-IBAN/reference-type compatibility, address fields, character sets, and more.

PDF output

{:ok, pdf_binary} = SwissQrBill.to_pdf(bill, language: :de)
File.write!("qr_bill.pdf", pdf_binary)

SVG output

Text is converted to glyph outlines (paths), so the output renders identically on all devices — no font installation required.

{:ok, svg_binary} = SwissQrBill.to_svg(bill, language: :de)
File.write!("qr_bill.svg", svg_binary)

PNG output

Rasterized from the PDF at configurable DPI for print-quality output.

{:ok, png_binary} = SwissQrBill.to_png(bill, language: :de, dpi: 300)
File.write!("qr_bill.png", png_binary)

Output sizes

All three formats support the :output_size option:

{:ok, pdf} = SwissQrBill.to_pdf(bill, language: :de, output_size: :a4)
{:ok, svg} = SwissQrBill.to_svg(bill, output_size: :qr_code)
{:ok, png} = SwissQrBill.to_png(bill, output_size: :a4, dpi: 150)

Languages

The :language option supports five languages. Defaults to :de.

{:ok, pdf} = SwissQrBill.to_pdf(bill, language: :fr)

Reference generators

QR reference (QRR)

Used with QR-IBANs (IID 30000-31999). Generates a 27-digit reference with mod-10 check digit.

# With customer ID (BESR-ID) and reference number
{:ok, ref} = SwissQrBill.Reference.QrReferenceGenerator.generate("210000", "313947143000901")
#=> {:ok, "210000000003139471430009017"}

# With reference number only
{:ok, ref} = SwissQrBill.Reference.QrReferenceGenerator.generate("313947143000901")
#=> {:ok, "000000000003139471430009018"}

Creditor reference (SCOR)

ISO 11649 creditor reference with RF prefix. Used with regular IBANs.

{:ok, ref} = SwissQrBill.Reference.CreditorReferenceGenerator.generate("I20200631")
#=> {:ok, "RF15I20200631"}

No reference (NON)

bill = SwissQrBill.set_payment_reference(bill, :non)

IBAN utilities

# Validate an IBAN
{:ok, normalized} = SwissQrBill.IBAN.validate("CH44 3199 9123 0008 8901 2")
#=> {:ok, "CH4431999123000889012"}

# Check if it's a QR-IBAN
SwissQrBill.IBAN.qr_iban?("CH4431999123000889012")
#=> true

# Format an IBAN
SwissQrBill.IBAN.format("CH4431999123000889012")
#=> "CH44 3199 9123 0008 8901 2"

Reference type and IBAN compatibility

QR-IBANs are identified by their IID (positions 5-9) being in the range 30000-31999.

Minimal bill (no amount, no debtor)

bill =
  SwissQrBill.new()
  |> SwissQrBill.set_creditor(SwissQrBill.Address.new("Muster AG", "8001", "Zürich", "CH"))
  |> SwissQrBill.set_creditor_information("CH93 0076 2011 6238 5295 7")
  |> SwissQrBill.set_payment_amount("CHF")
  |> SwissQrBill.set_payment_reference(:non)

{:ok, pdf} = SwissQrBill.to_pdf(bill)

When amount or debtor are omitted, placeholder corner marks are rendered per the SIX style guide.

Alternative schemes

Up to 2 alternative payment schemes can be added (e.g. eBill):

bill =
  bill
  |> SwissQrBill.add_alternative_scheme("eBill/B/41010560425610173")
  |> SwissQrBill.add_alternative_scheme("//S1/10/10201409/11/190512")

Output layout

The payment slip renders the complete payment part (210 x 105 mm):

• Receipt (left, 62 mm) — creditor, reference, amount, acceptance point
• Payment part (right, 148 mm) — QR code with Swiss cross, creditor, reference, additional information, amount, debtor

The layout follows the SIX style guide specifications.

Validation constraints

Dependencies

• qr_code — QR code generation
• pdf — PDF output
• poppler-utils — SVG and PNG conversion (system dependency, optional)

License

MIT