diff --git a/handlers/contract.go b/handlers/contract.go
index 4485194..8aacbd7 100644
--- a/handlers/contract.go
+++ b/handlers/contract.go
@@ -62,6 +62,8 @@ func GenerateContract(c *fiber.Ctx) error {
 		ReceiptMinimumAmount: 10,
 		EventName:            "Event name",
 		SponsoringHeader:     templates.ImageSponsoringHeaderBase64,
+		BarcodeFormat:        "ean13",
+		BarcodePrefix:        "1",
 	})
 	if err != nil {
 		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
diff --git a/services/templater.go b/services/templater.go
index c0a7cdf..eba649f 100644
--- a/services/templater.go
+++ b/services/templater.go
@@ -6,12 +6,13 @@ import (
 	"errors"
 	"html/template"
 	"image/png"
-	"math"
 	"strconv"
 
 	"git.odit.services/lfk/document-server/models"
 	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/code128"
 	"github.com/boombuler/barcode/ean"
+	"github.com/boombuler/barcode/qr"
 )
 
 type Templater interface {
@@ -29,38 +30,57 @@ type ContractTemplateOptions struct {
 	ReceiptMinimumAmount int             `json:"receipt_minimum_amount"`
 	EventName            string          `json:"event_name"`
 	SponsoringHeader     string          `json:"base_url"`
+	BarcodeFormat        string          `json:"barcode_format"`
+	BarcodePrefix        string          `json:"barcode_prefix"`
 }
 
-func idToEan13(id int) (string, error) {
-	multiply := [2]int{1, 3}
+func idToEan13(id int, prefix string) (string, error) {
 	idStr := strconv.Itoa(id)
 
 	if len(idStr) > 12 {
 		return "", errors.New("id too long")
 	}
-	for len(idStr) < 12 {
+
+	for len(idStr) < 11 {
 		idStr = "0" + idStr
 	}
+	idStr = prefix + idStr
 
-	total := 0
-	for i, char := range idStr {
-		num, err := strconv.Atoi(string(char))
+	return idStr, nil
+}
+
+func (t *DefaultTemplater) GenerateBarcode(code int, format string, prefix string) (string, error) {
+	var generatedCode barcode.Barcode
+	var err error
+
+	switch format {
+	case "ean13":
+		encodedEan, err := idToEan13(code, prefix)
 		if err != nil {
 			return "", err
 		}
-		total += num * multiply[i%2]
+		generatedCode, err = ean.Encode(encodedEan)
+		if err != nil {
+			return "", err
+		}
+		break
+	case "code128":
+		generatedCode, err = code128.Encode(prefix + strconv.Itoa(code))
+		if err != nil {
+			return "", err
+		}
+		break
+	case "qr":
+		generatedCode, err = qr.Encode(prefix+strconv.Itoa(code), qr.M, qr.Numeric)
+		if err != nil {
+			return "", err
+		}
+		break
+	default:
+		return "", errors.New("unknown barcode format")
 	}
-	checkSum := (int(math.Ceil(float64(total)/10)) * 10) - total
-	return idStr + strconv.Itoa(checkSum), nil
-}
 
-func (t *DefaultTemplater) GenerateBarcode(code int) (string, error) {
-	encodedEan, err := idToEan13(code)
-	eanCode, err := ean.Encode(encodedEan)
-	if err != nil {
-		return "", err
-	}
-	scaledCode, err := barcode.Scale(eanCode, 100, 50)
+	scaledCode, err := barcode.Scale(generatedCode, 1000, 500)
 	if err != nil {
 		return "", err
 	}
diff --git a/templates/contract/de.html b/templates/contract/de.html
index f8bd4ec..f8dc751 100644
--- a/templates/contract/de.html
+++ b/templates/contract/de.html
@@ -56,7 +56,7 @@
         </div>
         <div class="column">
           <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
-            src="data:image/png;base64,{{ barcode .ID }}" />
+            src="data:image/png;base64,{{ barcode .ID $.BarcodeFormat $.BarcodePrefix }}" />
         </div>
       </div>
       <div class="columns" style="padding-top: 1rem;">
diff --git a/templates/contract/en.html b/templates/contract/en.html
index 1382eae..4de8397 100644
--- a/templates/contract/en.html
+++ b/templates/contract/en.html
@@ -55,7 +55,7 @@
         </div>
         <div class="column">
           <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
-            src="data:image/png;base64,{{ barcode .ID}}" />
+            src="data:image/png;base64,{{ barcode .ID $.BarcodeFormat $.BarcodePrefix }}"/>
         </div>
       </div>
       <div class="columns" style="padding-top: 1rem;">