diff --git a/app/components/RichTextEditor.tsx b/app/components/RichTextEditor.tsx
new file mode 100644
index 0000000..6f203e1
--- /dev/null
+++ b/app/components/RichTextEditor.tsx
@@ -0,0 +1,253 @@
+import { useEditor, EditorContent } from "@tiptap/react";
+import StarterKit from "@tiptap/starter-kit";
+import Link from "@tiptap/extension-link";
+import { useEffect, useState } from "react";
+
+interface RichTextEditorProps {
+  /** Hidden form field name; the rendered HTML is mirrored into it. */
+  name: string;
+  /** Visible label rendered above the editor. */
+  label: string;
+  /** Initial HTML loaded into the editor. */
+  defaultValue?: string;
+  /** Optional helper text shown below the editor. */
+  helpText?: string;
+  /** Insertable variable tokens shown as quick-insert buttons. */
+  variables?: { token: string; label?: string }[];
+  /** Min editor height in px. */
+  minHeight?: number;
+}
+
+/**
+ * TipTap-based WYSIWYG editor that mirrors its HTML content into a hidden
+ * input so the parent <Form> can submit it like any other field.
+ *
+ * Variables like {{invoiceNumber}} are inserted as plain text — the email
+ * renderer is responsible for substituting them at send time.
+ */
+export function RichTextEditor({
+  name,
+  label,
+  defaultValue = "",
+  helpText,
+  variables = [],
+  minHeight = 200,
+}: RichTextEditorProps) {
+  // TipTap calls into the DOM on init; defer mounting until after hydration
+  // so SSR markup matches the initial client render.
+  const [mounted, setMounted] = useState(false);
+  useEffect(() => setMounted(true), []);
+
+  const editor = useEditor({
+    immediatelyRender: false,
+    extensions: [
+      StarterKit.configure({
+        // Drop heading levels we don't need to keep the toolbar focused.
+        heading: { levels: [2, 3] },
+      }),
+      Link.configure({ openOnClick: false }),
+    ],
+    content: defaultValue || "<p></p>",
+    editorProps: {
+      attributes: {
+        class: "wysiwyg-editor",
+        style: `min-height:${minHeight}px;padding:8px 12px;border:1px solid #c9cccf;border-top:0;border-radius:0 0 6px 6px;background:#fff;outline:none;`,
+      },
+    },
+  });
+
+  // Keep editor disposed cleanly on unmount.
+  useEffect(() => () => editor?.destroy(), [editor]);
+
+  const html = editor?.getHTML() ?? defaultValue;
+
+  if (!mounted) {
+    // Server / pre-hydration fallback: a textarea so the value is still
+    // submittable if JS fails or before TipTap mounts.
+    return (
+      <div>
+        {label ? (
+          <label style={{ display: "block", fontSize: 14, fontWeight: 500, marginBottom: 6 }}>
+            {label}
+          </label>
+        ) : null}
+        <textarea
+          name={name}
+          defaultValue={defaultValue}
+          style={{ width: "100%", minHeight, padding: 8, border: "1px solid #c9cccf", borderRadius: 6 }}
+        />
+        {helpText ? (
+          <div style={{ fontSize: 12, color: "#6d7175", marginTop: 4 }}>{helpText}</div>
+        ) : null}
+      </div>
+    );
+  }
+
+  return (
+    <div>
+      {label ? (
+        <label style={{ display: "block", fontSize: 14, fontWeight: 500, marginBottom: 6 }}>
+          {label}
+        </label>
+      ) : null}
+      <div
+        role="toolbar"
+        style={{
+          display: "flex",
+          flexWrap: "wrap",
+          gap: 4,
+          padding: 6,
+          border: "1px solid #c9cccf",
+          borderRadius: "6px 6px 0 0",
+          background: "#f6f6f7",
+        }}
+      >
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleBold().run()}
+          active={editor?.isActive("bold") ?? false}
+          label="B"
+          title="Bold"
+          bold
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleItalic().run()}
+          active={editor?.isActive("italic") ?? false}
+          label="I"
+          title="Italic"
+          italic
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleStrike().run()}
+          active={editor?.isActive("strike") ?? false}
+          label="S"
+          title="Strikethrough"
+        />
+        <Sep />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().setParagraph().run()}
+          active={editor?.isActive("paragraph") ?? false}
+          label="¶"
+          title="Paragraph"
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleHeading({ level: 2 }).run()}
+          active={editor?.isActive("heading", { level: 2 }) ?? false}
+          label="H2"
+          title="Heading 2"
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleHeading({ level: 3 }).run()}
+          active={editor?.isActive("heading", { level: 3 }) ?? false}
+          label="H3"
+          title="Heading 3"
+        />
+        <Sep />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleBulletList().run()}
+          active={editor?.isActive("bulletList") ?? false}
+          label="• List"
+          title="Bullet list"
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().toggleOrderedList().run()}
+          active={editor?.isActive("orderedList") ?? false}
+          label="1. List"
+          title="Numbered list"
+        />
+        <Sep />
+        <ToolbarButton
+          onClick={() => {
+            const url = window.prompt("URL");
+            if (url) editor?.chain().focus().setLink({ href: url }).run();
+            else editor?.chain().focus().unsetLink().run();
+          }}
+          active={editor?.isActive("link") ?? false}
+          label="Link"
+          title="Insert/remove link"
+        />
+        <Sep />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().undo().run()}
+          active={false}
+          label="↺"
+          title="Undo"
+        />
+        <ToolbarButton
+          onClick={() => editor?.chain().focus().redo().run()}
+          active={false}
+          label="↻"
+          title="Redo"
+        />
+      </div>
+      <EditorContent editor={editor} />
+      <input type="hidden" name={name} value={html} />
+      {variables.length > 0 ? (
+        <div style={{ marginTop: 6, display: "flex", flexWrap: "wrap", gap: 4, alignItems: "center" }}>
+          <span style={{ fontSize: 12, color: "#6d7175", marginRight: 4 }}>Insert variable:</span>
+          {variables.map((v) => (
+            <button
+              key={v.token}
+              type="button"
+              onClick={() => editor?.chain().focus().insertContent(v.token).run()}
+              style={{
+                fontSize: 12,
+                padding: "2px 8px",
+                border: "1px solid #c9cccf",
+                borderRadius: 12,
+                background: "#fff",
+                cursor: "pointer",
+              }}
+              title={`Inserts ${v.token}`}
+            >
+              {v.label ?? v.token}
+            </button>
+          ))}
+        </div>
+      ) : null}
+      {helpText ? (
+        <div style={{ fontSize: 12, color: "#6d7175", marginTop: 4 }}>{helpText}</div>
+      ) : null}
+    </div>
+  );
+}
+
+function ToolbarButton({
+  onClick,
+  active,
+  label,
+  title,
+  bold,
+  italic,
+}: {
+  onClick: () => void;
+  active: boolean;
+  label: string;
+  title: string;
+  bold?: boolean;
+  italic?: boolean;
+}) {
+  return (
+    <button
+      type="button"
+      onClick={onClick}
+      title={title}
+      style={{
+        padding: "4px 10px",
+        background: active ? "#e3e5e7" : "#fff",
+        border: "1px solid #c9cccf",
+        borderRadius: 4,
+        fontWeight: bold ? 700 : 500,
+        fontStyle: italic ? "italic" : "normal",
+        cursor: "pointer",
+        fontSize: 13,
+        minWidth: 28,
+      }}
+    >
+      {label}
+    </button>
+  );
+}
+
+function Sep() {
+  return <span aria-hidden style={{ width: 1, background: "#c9cccf", margin: "2px 4px" }} />;
+}
diff --git a/app/routes/app.invoices.tsx b/app/routes/app.invoices.tsx
index 2467499..5901367 100644
--- a/app/routes/app.invoices.tsx
+++ b/app/routes/app.invoices.tsx
@@ -165,8 +165,8 @@ export default function InvoicesPage() {
         </s-stack>
 
         {isLoading ? (
-          <s-stack direction="inline" gap="small" alignItems="center">
-            <s-spinner size="small" accessibilityLabel="Loading orders" />
+          <s-stack direction="inline" gap="base" alignItems="center">
+            <s-spinner size="base" accessibilityLabel="Loading orders" />
             <s-text tone="neutral">Loading…</s-text>
           </s-stack>
         ) : orders.length === 0 ? (
diff --git a/app/routes/app.settings.tsx b/app/routes/app.settings.tsx
index 208c777..033ec63 100644
--- a/app/routes/app.settings.tsx
+++ b/app/routes/app.settings.tsx
@@ -13,6 +13,7 @@ import {
   deleteStoredLogo,
   storeUploadedLogo,
 } from "../services/invoice/logoCache.server";
+import { RichTextEditor } from "../components/RichTextEditor";
 
 interface SettingsFieldErrors {
   vatId?: string;
@@ -152,6 +153,10 @@ export const action = async ({ request }: ActionFunctionArgs) => {
     smtpFromName: str("smtpFromName"),
     smtpFromEmail: str("smtpFromEmail"),
     smtpReplyTo: str("smtpReplyTo"),
+    emailSubjectDe: str("emailSubjectDe"),
+    emailBodyHtmlDe: str("emailBodyHtmlDe"),
+    emailSubjectEn: str("emailSubjectEn"),
+    emailBodyHtmlEn: str("emailBodyHtmlEn"),
   };
 
   await db.shopSettings.upsert({
@@ -361,6 +366,43 @@ export default function SettingsRoute() {
           </s-stack>
         </s-section>
 
+        <s-section heading="Email templates">
+          <s-stack direction="block" gap="base">
+            <s-paragraph>
+              These templates are used when sending the invoice PDF by email.
+              Leave a field empty to fall back to the built-in default.
+            </s-paragraph>
+
+            <Field
+              label="Subject (German)"
+              name="emailSubjectDe"
+              defaultValue={settings.emailSubjectDe}
+              helpText="Variables like {{invoiceNumber}} are substituted at send time."
+            />
+            <RichTextEditor
+              name="emailBodyHtmlDe"
+              label="Body (German)"
+              defaultValue={settings.emailBodyHtmlDe}
+              variables={EMAIL_VARS}
+              minHeight={220}
+            />
+
+            <Field
+              label="Subject (English)"
+              name="emailSubjectEn"
+              defaultValue={settings.emailSubjectEn}
+              helpText="Variables like {{invoiceNumber}} are substituted at send time."
+            />
+            <RichTextEditor
+              name="emailBodyHtmlEn"
+              label="Body (English)"
+              defaultValue={settings.emailBodyHtmlEn}
+              variables={EMAIL_VARS}
+              minHeight={220}
+            />
+          </s-stack>
+        </s-section>
+
         <s-section>
           <s-stack direction="inline" gap="base" justifyContent="end" alignItems="center">
             {isSaving ? <s-text tone="neutral">Saving…</s-text> : null}
@@ -374,6 +416,17 @@ export default function SettingsRoute() {
   );
 }
 
+const EMAIL_VARS = [
+  { token: "{{invoiceNumber}}" },
+  { token: "{{customerName}}" },
+  { token: "{{customerFirstName}}" },
+  { token: "{{orderName}}" },
+  { token: "{{totalGross}}" },
+  { token: "{{dueDate}}" },
+  { token: "{{companyName}}" },
+  { token: "{{ownerName}}" },
+];
+
 interface FieldProps {
   label: string;
   name: string;
diff --git a/app/services/invoice/email.server.ts b/app/services/invoice/email.server.ts
index 9f30c0c..4104ff8 100644
--- a/app/services/invoice/email.server.ts
+++ b/app/services/invoice/email.server.ts
@@ -63,14 +63,31 @@ export async function sendInvoiceEmail(
   // Build email content.
   const language = pickLanguage(args.customerLocale ?? settings.defaultLanguage);
   const t = getStrings(language);
-  const subject = `${t.invoice} ${invoice.invoiceNumber}` +
-    (settings.companyName ? ` — ${settings.companyName}` : "");
-  const body = renderEmailBody({
+  const customer = parseCustomer(invoice.customerJson);
+  const totals = parseTotals(invoice.totalsJson);
+  const vars = buildTemplateVars({
+    invoice,
     settings,
-    invoiceNumber: invoice.invoiceNumber,
-    language,
+    customerName: customer.customerName ?? "",
+    customerFirstName: (customer.customerName ?? "").split(/\s+/)[0] ?? "",
+    totalGross: totals.totalGross ?? "",
   });
 
+  const customSubject = language === "en" ? settings.emailSubjectEn : settings.emailSubjectDe;
+  const subject = customSubject
+    ? renderTemplate(customSubject, vars)
+    : `${t.invoice} ${invoice.invoiceNumber}` +
+      (settings.companyName ? ` — ${settings.companyName}` : "");
+
+  const customBodyHtml = language === "en" ? settings.emailBodyHtmlEn : settings.emailBodyHtmlDe;
+  const body = customBodyHtml
+    ? renderHtmlBody(renderTemplate(customBodyHtml, vars))
+    : renderEmailBody({
+        settings,
+        invoiceNumber: invoice.invoiceNumber,
+        language,
+      });
+
   // Download the PDF (Shopify Files URLs are public CDN URLs).
   let pdfBytes: Uint8Array;
   try {
@@ -203,3 +220,91 @@ function escapeHtml(s: string): string {
     ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[c]!,
   );
 }
+
+// --- Template variables ----------------------------------------------------
+
+interface TemplateVars {
+  invoiceNumber: string;
+  customerName: string;
+  customerFirstName: string;
+  orderName: string;
+  totalGross: string;
+  dueDate: string;
+  companyName: string;
+  ownerName: string;
+}
+
+function buildTemplateVars(args: {
+  invoice: { invoiceNumber: string; orderName: string };
+  settings: ShopSettings;
+  customerName: string;
+  customerFirstName: string;
+  totalGross: string;
+}): TemplateVars {
+  const dueMs = Number((args.invoice as unknown as { dueDate?: string | Date }).dueDate ?? 0);
+  return {
+    invoiceNumber: args.invoice.invoiceNumber,
+    orderName: args.invoice.orderName,
+    customerName: args.customerName,
+    customerFirstName: args.customerFirstName,
+    totalGross: args.totalGross,
+    dueDate: dueMs ? new Date(dueMs).toLocaleDateString() : "",
+    companyName: args.settings.companyName,
+    ownerName: args.settings.ownerName,
+  };
+}
+
+/**
+ * Substitutes {{token}} placeholders in `template`. Unknown tokens are left
+ * in place so the user notices typos instead of silent blanks. Values are
+ * inserted verbatim — callers are responsible for HTML-escaping if needed.
+ */
+function renderTemplate(template: string, vars: TemplateVars): string {
+  return template.replace(/\{\{\s*([a-zA-Z_][a-zA-Z0-9_]*)\s*\}\}/g, (full, key) => {
+    const v = (vars as unknown as Record<string, string | undefined>)[key];
+    return v === undefined ? full : v;
+  });
+}
+
+/** Strips HTML tags to produce a plain-text fallback for the multipart email. */
+function htmlToText(html: string): string {
+  return html
+    .replace(/<br\s*\/?>(?=\s|$)/gi, "\n")
+    .replace(/<\/p>/gi, "\n\n")
+    .replace(/<[^>]+>/g, "")
+    .replace(/&nbsp;/g, " ")
+    .replace(/&amp;/g, "&")
+    .replace(/&lt;/g, "<")
+    .replace(/&gt;/g, ">")
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/\n{3,}/g, "\n\n")
+    .trim();
+}
+
+function renderHtmlBody(html: string): { text: string; html: string } {
+  return { html, text: htmlToText(html) };
+}
+
+interface InvoiceCustomerSnapshot {
+  customerEmail?: string;
+  customerName?: string;
+}
+function parseCustomer(json: string): InvoiceCustomerSnapshot {
+  try {
+    return JSON.parse(json) as InvoiceCustomerSnapshot;
+  } catch {
+    return {};
+  }
+}
+
+interface InvoiceTotalsSnapshot {
+  totalGross?: string;
+}
+function parseTotals(json: string): InvoiceTotalsSnapshot {
+  try {
+    return JSON.parse(json) as InvoiceTotalsSnapshot;
+  } catch {
+    return {};
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 6182e59..3566846 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,10 @@
         "@shopify/app-bridge-react": "^4.2.4",
         "@shopify/shopify-app-react-router": "^1.1.0",
         "@shopify/shopify-app-session-storage-prisma": "^8.0.0",
+        "@tiptap/extension-link": "^3.23.1",
+        "@tiptap/pm": "^3.23.1",
+        "@tiptap/react": "^3.23.1",
+        "@tiptap/starter-kit": "^3.23.1",
         "@types/nodemailer": "^8.0.0",
         "isbot": "^5.1.31",
         "nodemailer": "^8.0.7",
@@ -1130,6 +1134,34 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@floating-ui/core": {
+      "version": "1.7.5",
+      "resolved": "https://registry.npmjs.org/@floating-ui/core/-/core-1.7.5.tgz",
+      "integrity": "sha512-1Ih4WTWyw0+lKyFMcBHGbb5U5FtuHJuujoyyr5zTaWS5EYMeT6Jb2AuDeftsCsEuchO+mM2ij5+q9crhydzLhQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@floating-ui/utils": "^0.2.11"
+      }
+    },
+    "node_modules/@floating-ui/dom": {
+      "version": "1.7.6",
+      "resolved": "https://registry.npmjs.org/@floating-ui/dom/-/dom-1.7.6.tgz",
+      "integrity": "sha512-9gZSAI5XM36880PPMm//9dfiEngYoC6Am2izES1FF406YFsjvyBMmeJ2g4SAju3xWwtuynNRFL2s9hgxpLI5SQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@floating-ui/core": "^1.7.5",
+        "@floating-ui/utils": "^0.2.11"
+      }
+    },
+    "node_modules/@floating-ui/utils": {
+      "version": "0.2.11",
+      "resolved": "https://registry.npmjs.org/@floating-ui/utils/-/utils-0.2.11.tgz",
+      "integrity": "sha512-RiB/yIh78pcIxl6lLMG0CgBXAZ2Y0eVHqMPYugu+9U0AeT6YBeiJpf7lbdJNIugFP5SIjwNRgo4DhR1Qxi26Gg==",
+      "license": "MIT",
+      "optional": true
+    },
     "node_modules/@graphql-codegen/add": {
       "version": "5.0.3",
       "resolved": "https://registry.npmjs.org/@graphql-codegen/add/-/add-5.0.3.tgz",
@@ -4132,6 +4164,434 @@
         "tslib": "^2.8.0"
       }
     },
+    "node_modules/@tiptap/core": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.23.1.tgz",
+      "integrity": "sha512-8YvSGiJTeU5wPuGiYIIYgyiyaaT1CAx+kJL0bju0w871OvbJJj0T/ywhcmxGXW6pOal2T8X2xt9ZqE+vib0VJw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/pm": "3.23.1"
+      }
+    },
+    "node_modules/@tiptap/extension-blockquote": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-blockquote/-/extension-blockquote-3.23.1.tgz",
+      "integrity": "sha512-FdVZLZOkL06j3WLXOC2UeX7++Cj3qI2vfohruMJiz4vk1Q5UUH7G4+AykFzjzBJHrdEpkiRUkRpU1KZIWdbluw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/core": "3.23.1"
+      }
+    },
+    "node_modules/@tiptap/extension-bold": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bold/-/extension-bold-3.23.1.tgz",
+      "integrity": "sha512-EAYdNzyOjlQh2VBY1EhdxtiTjVMaOAD6P0ezms60dKRjd4oj/8grfXfUqwgo4NVdFb11Ks85vXoHuXJSylfR4A==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/core": "3.23.1"
+      }
+    },
+    "node_modules/@tiptap/extension-bubble-menu": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bubble-menu/-/extension-bubble-menu-3.23.1.tgz",
+      "integrity": "sha512-1advMCpPkHD/3ucZhYmNau8B4tF0L6iRAFhUOglp5bBZDuq13+rYujh3cm4vFmjH9KqThzpcUDn+ZU2c+mTMyw==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "@floating-ui/dom": "^1.0.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/core": "3.23.1",
+        "@tiptap/pm": "3.23.1"
+      }
+    },
+    "node_modules/@tiptap/extension-bullet-list": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bullet-list/-/extension-bullet-list-3.23.1.tgz",
+      "integrity": "sha512-owWnBBI4t+jqVDY0naDjhsAmrNGldh4czouef2K+mEf032B7uGsDVCwKp1qaX1JZesyYDfvXOaIwT22hNID2mw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/extension-list": "3.23.1"
+      }
+    },
+    "node_modules/@tiptap/extension-code": {
+      "version": "3.23.1",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-code/-/extension-code-3.23.1.tgz",
+      "integrity": "sha512-nGuhb4YghgTfkejwWHrD9GSpwcC5kkVmm2sN/UY4yceDw+PkyysYKJWZehRLTOC8GNgSAhq/EeQeq14Xwk6dyg==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/core": "3.23.1"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/orderedmap/-/orderedmap-2.1.1.tgz",
+      "integrity": "sha512-TvAWxi0nDe1j/rtMcWcIj94+Ffe6n7zhow33h40SKxmsmozs6dz/e+EajymfoFcHd7sxNn8yHM8839uixMOV6g==",
+      "license": "MIT"
+    },
     "node_modules/own-keys": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/own-keys/-/own-keys-1.0.1.tgz",
@@ -10815,6 +11298,135 @@
         "react-is": "^16.13.1"
       }
     },
+    "node_modules/prosemirror-changeset": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-changeset/-/prosemirror-changeset-2.4.1.tgz",
+      "integrity": "sha512-96WBLhOaYhJ+kPhLg3uW359Tz6I/MfcrQfL4EGv4SrcqKEMC1gmoGrXHecPE8eOwTVCJ4IwgfzM8fFad25wNfw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-transform": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-commands": {
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-commands/-/prosemirror-commands-1.7.1.tgz",
+      "integrity": "sha512-rT7qZnQtx5c0/y/KlYaGvtG411S97UaL6gdp6RIZ23DLHanMYLyfGBV5DtSnZdthQql7W+lEVbpSfwtO8T+L2w==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.10.2"
+      }
+    },
+    "node_modules/prosemirror-dropcursor": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/prosemirror-dropcursor/-/prosemirror-dropcursor-1.8.2.tgz",
+      "integrity": "sha512-CCk6Gyx9+Tt2sbYk5NK0nB1ukHi2ryaRgadV/LvyNuO3ena1payM2z6Cg0vO1ebK8cxbzo41ku2DE5Axj1Zuiw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.1.0",
+        "prosemirror-view": "^1.1.0"
+      }
+    },
+    "node_modules/prosemirror-gapcursor": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-gapcursor/-/prosemirror-gapcursor-1.4.1.tgz",
+      "integrity": "sha512-pMdYaEnjNMSwl11yjEGtgTmLkR08m/Vl+Jj443167p9eB3HVQKhYCc4gmHVDsLPODfZfjr/MmirsdyZziXbQKw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-keymap": "^1.0.0",
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-view": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-history": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-history/-/prosemirror-history-1.5.0.tgz",
+      "integrity": "sha512-zlzTiH01eKA55UAf1MEjtssJeHnGxO0j4K4Dpx+gnmX9n+SHNlDqI2oO1Kv1iPN5B1dm5fsljCfqKF9nFL6HRg==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.2.2",
+        "prosemirror-transform": "^1.0.0",
+        "prosemirror-view": "^1.31.0",
+        "rope-sequence": "^1.3.0"
+      }
+    },
+    "node_modules/prosemirror-keymap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/prosemirror-keymap/-/prosemirror-keymap-1.2.3.tgz",
+      "integrity": "sha512-4HucRlpiLd1IPQQXNqeo81BGtkY8Ai5smHhKW9jjPKRc2wQIxksg7Hl1tTI2IfT2B/LgX6bfYvXxEpJl7aKYKw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0",
+        "w3c-keyname": "^2.2.0"
+      }
+    },
+    "node_modules/prosemirror-model": {
+      "version": "1.25.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-model/-/prosemirror-model-1.25.4.tgz",
+      "integrity": "sha512-PIM7E43PBxKce8OQeezAs9j4TP+5yDpZVbuurd1h5phUxEKIu+G2a+EUZzIC5nS1mJktDJWzbqS23n1tsAf5QA==",
+      "license": "MIT",
+      "dependencies": {
+        "orderedmap": "^2.0.0"
+      }
+    },
+    "node_modules/prosemirror-schema-list": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-schema-list/-/prosemirror-schema-list-1.5.1.tgz",
+      "integrity": "sha512-927lFx/uwyQaGwJxLWCZRkjXG0p48KpMj6ueoYiu4JX05GGuGcgzAy62dfiV8eFZftgyBUvLx76RsMe20fJl+Q==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.7.3"
+      }
+    },
+    "node_modules/prosemirror-state": {
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-state/-/prosemirror-state-1.4.4.tgz",
+      "integrity": "sha512-6jiYHH2CIGbCfnxdHbXZ12gySFY/fz/ulZE333G6bPqIZ4F+TXo9ifiR86nAHpWnfoNjOb3o5ESi7J8Uz1jXHw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-transform": "^1.0.0",
+        "prosemirror-view": "^1.27.0"
+      }
+    },
+    "node_modules/prosemirror-tables": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/prosemirror-tables/-/prosemirror-tables-1.8.5.tgz",
+      "integrity": "sha512-V/0cDCsHKHe/tfWkeCmthNUcEp1IVO3p6vwN8XtwE9PZQLAZJigbw3QoraAdfJPir4NKJtNvOB8oYGKRl+t0Dw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-keymap": "^1.2.3",
+        "prosemirror-model": "^1.25.4",
+        "prosemirror-state": "^1.4.4",
+        "prosemirror-transform": "^1.10.5",
+        "prosemirror-view": "^1.41.4"
+      }
+    },
+    "node_modules/prosemirror-transform": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-transform/-/prosemirror-transform-1.12.0.tgz",
+      "integrity": "sha512-GxboyN4AMIsoHNtz5uf2r2Ru551i5hWeCMD6E2Ib4Eogqoub0NflniaBPVQ4MrGE5yZ8JV9tUHg9qcZTTrcN4w==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.21.0"
+      }
+    },
+    "node_modules/prosemirror-view": {
+      "version": "1.41.8",
+      "resolved": "https://registry.npmjs.org/prosemirror-view/-/prosemirror-view-1.41.8.tgz",
+      "integrity": "sha512-TnKDdohEatgyZNGCDWIdccOHXhYloJwbwU+phw/a23KBvJIR9lWQWW7WHHK3vBdOLDNuF7TaX98GObUZOWkOnA==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.20.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.1.0"
+      }
+    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -11392,6 +12004,12 @@
         "fsevents": "~2.3.2"
       }
     },
+    "node_modules/rope-sequence": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/rope-sequence/-/rope-sequence-1.3.4.tgz",
+      "integrity": "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ==",
+      "license": "MIT"
+    },
     "node_modules/run-async": {
       "version": "2.4.1",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
@@ -13128,6 +13746,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/use-sync-external-store": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
+      "integrity": "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -13301,6 +13928,12 @@
         }
       }
     },
+    "node_modules/w3c-keyname": {
+      "version": "2.2.8",
+      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
+      "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
+      "license": "MIT"
+    },
     "node_modules/wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
diff --git a/package.json b/package.json
index d0246b0..e6b277d 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,10 @@
     "@shopify/app-bridge-react": "^4.2.4",
     "@shopify/shopify-app-react-router": "^1.1.0",
     "@shopify/shopify-app-session-storage-prisma": "^8.0.0",
+    "@tiptap/extension-link": "^3.23.1",
+    "@tiptap/pm": "^3.23.1",
+    "@tiptap/react": "^3.23.1",
+    "@tiptap/starter-kit": "^3.23.1",
     "@types/nodemailer": "^8.0.0",
     "isbot": "^5.1.31",
     "nodemailer": "^8.0.7",
diff --git a/prisma/migrations/20260508205959_add_email_templates/migration.sql b/prisma/migrations/20260508205959_add_email_templates/migration.sql
new file mode 100644
index 0000000..f82e4bf
--- /dev/null
+++ b/prisma/migrations/20260508205959_add_email_templates/migration.sql
@@ -0,0 +1,55 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_ShopSettings" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "shopDomain" TEXT NOT NULL,
+    "companyName" TEXT NOT NULL DEFAULT '',
+    "legalForm" TEXT NOT NULL DEFAULT '',
+    "ownerName" TEXT NOT NULL DEFAULT '',
+    "addressLine1" TEXT NOT NULL DEFAULT '',
+    "addressLine2" TEXT NOT NULL DEFAULT '',
+    "postalCode" TEXT NOT NULL DEFAULT '',
+    "city" TEXT NOT NULL DEFAULT '',
+    "countryCode" TEXT NOT NULL DEFAULT 'AT',
+    "phone" TEXT NOT NULL DEFAULT '',
+    "email" TEXT NOT NULL DEFAULT '',
+    "website" TEXT NOT NULL DEFAULT '',
+    "vatId" TEXT NOT NULL DEFAULT '',
+    "taxNumber" TEXT NOT NULL DEFAULT '',
+    "registrationNo" TEXT NOT NULL DEFAULT '',
+    "registrationCourt" TEXT NOT NULL DEFAULT '',
+    "bankName" TEXT NOT NULL DEFAULT '',
+    "iban" TEXT NOT NULL DEFAULT '',
+    "bic" TEXT NOT NULL DEFAULT '',
+    "giroCodeEnabled" BOOLEAN NOT NULL DEFAULT true,
+    "numberingMode" TEXT NOT NULL DEFAULT 'shopify_order_number',
+    "invoicePrefix" TEXT NOT NULL DEFAULT 'RE-',
+    "invoiceSeed" INTEGER NOT NULL DEFAULT 1000,
+    "defaultLanguage" TEXT NOT NULL DEFAULT 'de',
+    "paymentTermDays" INTEGER NOT NULL DEFAULT 14,
+    "footerNote" TEXT NOT NULL DEFAULT '',
+    "footerNoteEn" TEXT NOT NULL DEFAULT '',
+    "kleinunternehmer" BOOLEAN NOT NULL DEFAULT false,
+    "logoUrl" TEXT NOT NULL DEFAULT '',
+    "smtpHost" TEXT NOT NULL DEFAULT '',
+    "smtpPort" INTEGER NOT NULL DEFAULT 587,
+    "smtpSecure" BOOLEAN NOT NULL DEFAULT false,
+    "smtpUser" TEXT NOT NULL DEFAULT '',
+    "smtpPassword" TEXT NOT NULL DEFAULT '',
+    "smtpFromName" TEXT NOT NULL DEFAULT '',
+    "smtpFromEmail" TEXT NOT NULL DEFAULT '',
+    "smtpReplyTo" TEXT NOT NULL DEFAULT '',
+    "emailSubjectDe" TEXT NOT NULL DEFAULT '',
+    "emailBodyHtmlDe" TEXT NOT NULL DEFAULT '',
+    "emailSubjectEn" TEXT NOT NULL DEFAULT '',
+    "emailBodyHtmlEn" TEXT NOT NULL DEFAULT '',
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+INSERT INTO "new_ShopSettings" ("addressLine1", "addressLine2", "bankName", "bic", "city", "companyName", "countryCode", "createdAt", "defaultLanguage", "email", "footerNote", "footerNoteEn", "giroCodeEnabled", "iban", "id", "invoicePrefix", "invoiceSeed", "kleinunternehmer", "legalForm", "logoUrl", "numberingMode", "ownerName", "paymentTermDays", "phone", "postalCode", "registrationCourt", "registrationNo", "shopDomain", "smtpFromEmail", "smtpFromName", "smtpHost", "smtpPassword", "smtpPort", "smtpReplyTo", "smtpSecure", "smtpUser", "taxNumber", "updatedAt", "vatId", "website") SELECT "addressLine1", "addressLine2", "bankName", "bic", "city", "companyName", "countryCode", "createdAt", "defaultLanguage", "email", "footerNote", "footerNoteEn", "giroCodeEnabled", "iban", "id", "invoicePrefix", "invoiceSeed", "kleinunternehmer", "legalForm", "logoUrl", "numberingMode", "ownerName", "paymentTermDays", "phone", "postalCode", "registrationCourt", "registrationNo", "shopDomain", "smtpFromEmail", "smtpFromName", "smtpHost", "smtpPassword", "smtpPort", "smtpReplyTo", "smtpSecure", "smtpUser", "taxNumber", "updatedAt", "vatId", "website" FROM "ShopSettings";
+DROP TABLE "ShopSettings";
+ALTER TABLE "new_ShopSettings" RENAME TO "ShopSettings";
+CREATE UNIQUE INDEX "ShopSettings_shopDomain_key" ON "ShopSettings"("shopDomain");
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 9f7d720..451d83c 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -93,6 +93,12 @@ model ShopSettings {
   smtpFromEmail     String   @default("")
   smtpReplyTo       String   @default("")
 
+  // Email templates (HTML, with {{var}} placeholders). Empty = use defaults.
+  emailSubjectDe    String   @default("")
+  emailBodyHtmlDe   String   @default("")
+  emailSubjectEn    String   @default("")
+  emailBodyHtmlEn   String   @default("")
+
   createdAt         DateTime @default(now())
   updatedAt         DateTime @updatedAt