diff --git a/output/debug/customers-debug.png b/output/debug/customers-debug.png
new file mode 100644
index 00000000..6d360f6b
Binary files /dev/null and b/output/debug/customers-debug.png differ
diff --git a/playwright.global-setup.mjs b/playwright.global-setup.mjs
index ebf9cd79..d8d00733 100644
--- a/playwright.global-setup.mjs
+++ b/playwright.global-setup.mjs
@@ -13,6 +13,7 @@ const runtimeNamespace = String(process.env.PLAYWRIGHT_ARTIFACT_NAMESPACE || `po
   .replace(/[^a-zA-Z0-9._-]+/g, "-");
 const pidFile = path.resolve(process.cwd(), "output/playwright", `dev-server-${runtimeNamespace}.json`);
 const serverOutputLimit = 80;
+const activeOutputReaders = [];
 // Hardlinked Windows worktrees can break Vite's bundled config temp paths during Playwright boot.
 const viteDevArgs = [
   "run",
@@ -289,12 +290,107 @@ async function warmUpAsset(url, expectedContentType, timeoutMs = 120_000) {
   throw new Error(`Timed out warming Playwright dev asset ${url}.`);
 }
 
+async function fetchWarmedAsset(url, expectedContentType, timeoutMs = 120_000) {
+  const deadline = Date.now() + timeoutMs;
+  const perRequestTimeoutMs = 10_000;
+
+  while (Date.now() < deadline) {
+    try {
+      const response = await fetch(url, {
+        redirect: "manual",
+        signal: AbortSignal.timeout(perRequestTimeoutMs),
+      });
+      const contentType = response.headers.get("content-type") || "";
+
+      if (response.ok && contentType.toLowerCase().includes(expectedContentType)) {
+        return await response.text();
+      }
+    } catch {
+      // keep polling until the Vite transform is ready
+    }
+
+    await new Promise((resolve) => setTimeout(resolve, 500));
+  }
+
+  throw new Error(`Timed out warming Playwright dev asset ${url}.`);
+}
+
+function extractModuleImports(source) {
+  const specifiers = new Set();
+  const importPattern =
+    /\bimport(?:\s+[^"'()]+?\s+from\s+)?["']([^"']+)["']|\bimport\(\s*["']([^"']+)["']\s*\)/g;
+
+  for (const match of source.matchAll(importPattern)) {
+    const specifier = match[1] || match[2];
+    if (!specifier) {
+      continue;
+    }
+
+    if (specifier.startsWith("/src/") || specifier.startsWith("/node_modules/.vite/deps/")) {
+      specifiers.add(specifier);
+    }
+  }
+
+  return [...specifiers];
+}
+
+function resolveExpectedContentType(specifier) {
+  const cleanSpecifier = specifier.split("?")[0];
+
+  if (cleanSpecifier.endsWith(".css")) {
+    return "css";
+  }
+
+  if (cleanSpecifier.endsWith(".json")) {
+    return "json";
+  }
+
+  return "javascript";
+}
+
+async function warmModuleGraph(entryUrl, { depth = 2, timeoutMs = 120_000 } = {}) {
+  const queue = [{ url: entryUrl, depth: 0 }];
+  const visited = new Set();
+
+  while (queue.length > 0) {
+    const current = queue.shift();
+    if (!current || visited.has(current.url)) {
+      continue;
+    }
+
+    visited.add(current.url);
+
+    const source = await fetchWarmedAsset(current.url, "javascript", timeoutMs);
+    if (current.depth >= depth) {
+      continue;
+    }
+
+    for (const specifier of extractModuleImports(source)) {
+      const expectedContentType = resolveExpectedContentType(specifier);
+      const importUrl = new URL(specifier, current.url).toString();
+
+      if (expectedContentType === "javascript" && specifier.startsWith("/src/")) {
+        queue.push({
+          url: importUrl,
+          depth: current.depth + 1,
+        });
+        continue;
+      }
+
+      await warmUpAsset(importUrl, expectedContentType, timeoutMs);
+    }
+  }
+}
+
 async function warmUpDevServer(url) {
   const warmupTargets = await buildWarmupTargets();
 
   for (const target of warmupTargets) {
     await warmUpAsset(new URL(target.pathname, url).toString(), target.expectedContentType);
   }
+
+  await warmModuleGraph(new URL("/src/main.js", url).toString());
+  await new Promise((resolve) => setTimeout(resolve, 1000));
 }
 
 export default async function globalSetup() {
@@ -339,6 +435,7 @@ export default async function globalSetup() {
   const stderrLines = [];
   const stdoutReader = captureProcessOutput(serverProcess.stdout, stdoutLines);
   const stderrReader = captureProcessOutput(serverProcess.stderr, stderrLines);
+  activeOutputReaders.push(stdoutReader, stderrReader);
   serverProcess.unref();
 
   await fs.writeFile(pidFile, JSON.stringify({ pid: serverProcess.pid, port: devPort }), "utf8");
@@ -349,8 +446,5 @@ export default async function globalSetup() {
   } catch (error) {
     await killProcessTree(serverProcess.pid);
     throw error;
-  } finally {
-    stdoutReader.close();
-    stderrReader.close();
   }
 }
diff --git a/src/components/displays/Customers.vue b/src/components/displays/Customers.vue
index 3ed61abc..b398a508 100644
--- a/src/components/displays/Customers.vue
+++ b/src/components/displays/Customers.vue
@@ -1,23 +1,28 @@
 <script setup>
-import UsersPagination from "@/components/displays/pagination/models/SuperUserDashboard/UsersPagination.vue";
 import PageTitle from "@/components/global/PageTitle.vue";
-import { showCreateUserForm } from "@/components/forms/superUser/createUserForm.vue";
 import CustomersPagination from "@/components/displays/pagination/models/SuperUserDashboard/CustomersPagination.vue";
+import { showMassDataInsertModal } from "@/components/forms/other/functions/showModal.vue";
+import { init as initCustomerMassImport } from "@/components/forms/other/structures/CustomerMassImportDataStructure.vue";
 import { useI18n } from 'vue-i18n';
 
 const { t } = useI18n();
+
+const showCustomerMassImportModal = () => {
+  initCustomerMassImport();
+  showMassDataInsertModal();
+};
 </script>
 
 <template>
   <div>
     <PageTitle :title="t('superuser.pages.customers.title')" :subtitle="t('superuser.pages.customers.subtitle')">
       <template #buttons>
-        <!--<button class="button is-dark" @click="showCreateUserForm">
+        <button class="button is-dark" data-testid="superuser-customers-mass-import-button" @click="showCustomerMassImportModal">
           <span class="icon">
-            <i class="fas fa-plus"></i>
+            <i class="fas fa-file-import"></i>
           </span>
-          <span>{{ t('superuser.pages.customers.create') }}</span>
-        </button> -->
+          <span>Mass Import</span>
+        </button>
       </template>
     </PageTitle>
     <CustomersPagination auto-load="true" />
@@ -26,4 +31,4 @@ const { t } = useI18n();
 
 <style scoped>
 
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/displays/modals/MassDataInserterModal.vue b/src/components/displays/modals/MassDataInserterModal.vue
index 359333ae..aa03d11e 100644
--- a/src/components/displays/modals/MassDataInserterModal.vue
+++ b/src/components/displays/modals/MassDataInserterModal.vue
@@ -153,7 +153,7 @@ window.addEventListener("keydown", handleKeydown);
 </script>
 
 <template>
-  <div class="modal is-active" ref="modal">
+  <div class="modal is-active" ref="modal" data-testid="mass-data-inserter-modal">
     <div class="modal-background" @click="closeModal"></div>
     <div class="modal-card">
       <header class="modal-card-head">
@@ -229,4 +229,4 @@ window.addEventListener("keydown", handleKeydown);
 
 <style scoped>
 
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/displays/user/vehicles/vehiclesTable.vue b/src/components/displays/user/vehicles/vehiclesTable.vue
index 24752095..39926680 100644
--- a/src/components/displays/user/vehicles/vehiclesTable.vue
+++ b/src/components/displays/user/vehicles/vehiclesTable.vue
@@ -141,7 +141,7 @@ const getProductOptionsLabel = (vehicle) => {
           <th v-if="!props.compact">{{ $t('objects.columns.id') }}</th>
           <th v-if="!props.compact">{{ $t('objects.columns.customer_id') }}</th>
           <th>{{ $t('objects.bookings.columns.reg_1') }}</th>
-          <th>{{ $t('objects.columns.type') }}</th>
+          <th>{{ $t('vehicles.type') }}</th>
           <th>{{ $t('objects.vehicles.columns.wash_subscription') }}</th>
           <th v-if="!props.compact">{{ SessionUser.objects.product_options.meta.title }}</th>
           <th v-if="!props.compact">{{ $t('objects.columns.reference') }}</th>
diff --git a/src/components/forms/other/elements/MassDataInsertButtonSave.vue b/src/components/forms/other/elements/MassDataInsertButtonSave.vue
index d9f8c082..8d22e6bb 100644
--- a/src/components/forms/other/elements/MassDataInsertButtonSave.vue
+++ b/src/components/forms/other/elements/MassDataInsertButtonSave.vue
@@ -23,6 +23,7 @@ const onClickSave = () => {
     <!-- Confirm, save and close -->
     <button
         class="button is-light is-fullwidth"
+        data-testid="mass-data-insert-save-button"
         v-bind:disabled="getDataRows().length === 0"
         @click="onClickSave"
     >
@@ -35,4 +36,4 @@ const onClickSave = () => {
 
 <style scoped>
 
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/forms/other/elements/MassDataInsertControls.vue b/src/components/forms/other/elements/MassDataInsertControls.vue
index 721267a2..baa2e5c7 100644
--- a/src/components/forms/other/elements/MassDataInsertControls.vue
+++ b/src/components/forms/other/elements/MassDataInsertControls.vue
@@ -24,6 +24,7 @@ const onClickClear = () => {
     <!-- Add rows -->
     <button
         class="button is-light"
+        data-testid="mass-data-insert-add-button"
         @click="onClickAdd"
     >
       <span class="icon is-small">
@@ -34,6 +35,7 @@ const onClickClear = () => {
     <!-- Clear rows -->
     <button
         class="button is-danger is-light"
+        data-testid="mass-data-insert-clear-button"
         @click="onClickClear"
     >
       <span class="icon is-small">
@@ -46,4 +48,4 @@ const onClickClear = () => {
 
 <style scoped>
 
-</style>
\ No newline at end of file
+</style>
diff --git a/src/components/forms/other/functions/selectParseFile.vue b/src/components/forms/other/functions/selectParseFile.vue
index 7f89a3be..a54a8512 100644
--- a/src/components/forms/other/functions/selectParseFile.vue
+++ b/src/components/forms/other/functions/selectParseFile.vue
@@ -1,8 +1,8 @@
 <script>
-import { ref, computed, watch } from 'vue';
+import { ref } from 'vue';
+import * as XLSX from "xlsx";
 // This is used to make the user select a file (from their computer) to parse locally
 import { SessionUser } from "@/components/session/token/SessionUser.vue";
-import { setDataRows } from "@/components/forms/other/MassDataInserter.vue";
 import Swal from "sweetalert2";
 
 // File content
@@ -23,6 +23,10 @@ const showError = (message) => {
   });
 }
 
+const isSpreadsheetFile = (file) => {
+  return /\.(xlsx|xls)$/i.test(file?.name ?? '');
+};
+
 export const initiateFileSelection = (onParsedFunction = null) => {
   // Reset the file content
   fileContent.value = '';
@@ -39,7 +43,7 @@ export const initiateFileSelection = (onParsedFunction = null) => {
   // Create a file input element
   const fileInput = document.createElement('input');
   fileInput.type = 'file';
-  fileInput.accept = '.csv, .txt'; // Accept only CSV and TXT files
+  fileInput.accept = '.xlsx, .xls, .csv, .txt, .tsv';
 
   // Listen for the change event
   fileInput.addEventListener('change', (event) => {
@@ -47,15 +51,24 @@ export const initiateFileSelection = (onParsedFunction = null) => {
     if (file) {
       const reader = new FileReader();
       reader.onload = (e) => {
+        if (isSpreadsheetFile(file)) {
+          if (validateSpreadsheetContent(e.target.result)) {
+            parseSpreadsheetContent(e.target.result);
+          }
+          return;
+        }
+
         fileContent.value = e.target.result;
-        // You can now use the file content as needed
-        //console.log('File content:', fileContent.value);
-        if (validateFileContent(fileContent.value)) {
-          // If the file content is valid, parse it
-          parseFileContent(fileContent.value);
+        if (validateDelimitedFileContent(fileContent.value)) {
+          parseDelimitedFileContent(fileContent.value);
         }
       };
-      reader.readAsText(file);
+
+      if (isSpreadsheetFile(file)) {
+        reader.readAsArrayBuffer(file);
+      } else {
+        reader.readAsText(file);
+      }
     }
   });
 
@@ -67,7 +80,7 @@ export const getFileContent = () => {
   return fileContent.value;
 };
 
-const validateFileContent = (content) => {
+const validateDelimitedFileContent = (content) => {
   // Check if the content is empty
   if (!content) {
     showError('File content is empty');
@@ -75,61 +88,129 @@ const validateFileContent = (content) => {
   }
 
   // Check if the content has at least one row
-  const rows = content.split('\n');
+  const rows = content
+      .split('\n')
+      .map((row) => normalizeLine(row))
+      .filter((row) => row.trim() !== '');
   if (rows.length === 0) {
     showError('File has no rows');
     return false;
   }
 
-  // Check if the first row has at least one column
-  const columns = rows[0].split(',');
-  if (columns.length === 0) {
-    showError('File has no columns');
-    return false;
-  }
-
   return true;
 };
 
-const cleanRow = (row) => {
-  // Remove leading and trailing whitespace
-  row = row.trim();
-  // Remove any extra commas
-  row = row.replace(/,+/g, ',');
-  // Remove any trailing commas
-  row = row.replace(/,$/, '');
-  // Remove \r and \n characters
-  row = row.replace(/\r/g, '');
-  // Replace \t with ;
-  row = row.replace(/\t/g, ';');
-  return row;
+const validateSpreadsheetContent = (content) => {
+  if (!(content instanceof ArrayBuffer) || content.byteLength === 0) {
+    showError('File content is empty');
+    return false;
+  }
+
+  return true;
 };
 
-const parseFileContent = (content) => {
-  // Split the content by new lines
-  const rows = content.split('\n');
-  // Clean up the rows
-  rows.forEach((row, index) => {
-    rows[index] = cleanRow(row);
-  });
-  // Split each row by commas (or other delimiters)
-  // This assumes that the file is a CSV file
-  const parsedData = rows.map(row => row.split(';'));
-  // Remove empty rows, and columns
-  parsedData.forEach((row, index) => {
-    if (row.length === 0 || row[0] === '') {
-      parsedData.splice(index, 1);
+const normalizeLine = (row) => {
+  return String(row ?? '')
+      .replace(/\uFEFF/g, '')
+      .replace(/\r/g, '')
+      .trimEnd();
+};
+
+const detectDelimiter = (rows) => {
+  const sampleRows = rows
+      .map((row) => normalizeLine(row))
+      .filter((row) => row.trim() !== '')
+      .slice(0, 5);
+
+  const candidates = ['\t', ';', ','];
+  let selectedDelimiter = ';';
+  let highestScore = -1;
+
+  candidates.forEach((candidate) => {
+    const score = sampleRows.reduce((sum, row) => {
+      return sum + ((row.match(new RegExp(candidate === '\t' ? '\\t' : `\\${candidate}`, 'g')) || []).length);
+    }, 0);
+
+    if (score > highestScore) {
+      highestScore = score;
+      selectedDelimiter = candidate;
     }
-    row.forEach((column, index) => {
-      if (column === '') {
-        row.splice(index, 1);
-      }
-    });
   });
-  // Set the parsed data to the dataRows
-  console.log(parsedData);
+
+  return selectedDelimiter;
+};
+
+const parseDelimitedRow = (row, delimiter) => {
+  const values = [];
+  let currentValue = '';
+  let insideQuotes = false;
+
+  for (let index = 0; index < row.length; index += 1) {
+    const character = row[index];
+    const nextCharacter = row[index + 1];
+
+    if (character === '"') {
+      if (insideQuotes && nextCharacter === '"') {
+        currentValue += '"';
+        index += 1;
+        continue;
+      }
+
+      insideQuotes = !insideQuotes;
+      continue;
+    }
+
+    if (!insideQuotes && character === delimiter) {
+      values.push(currentValue.trim());
+      currentValue = '';
+      continue;
+    }
+
+    currentValue += character;
+  }
+
+  values.push(currentValue.trim());
+  return values;
+};
+
+const parseDelimitedFileContent = (content) => {
+  const rows = content
+      .split('\n')
+      .map((row) => normalizeLine(row))
+      .filter((row) => row.trim() !== '');
+
+  const delimiter = detectDelimiter(rows);
+  const parsedData = rows
+      .map((row) => parseDelimitedRow(row, delimiter))
+      .filter((row) => row.some((column) => column !== ''));
+
+  parsedFileContent.value = parsedData;
+  onParsed(onParsedFunctionCache.value);
+};
+
+const parseSpreadsheetContent = (content) => {
+  const workbook = XLSX.read(content, {
+    type: 'array',
+    raw: true,
+  });
+
+  const firstSheetName = workbook.SheetNames[0];
+  if (!firstSheetName) {
+    showError('File has no sheets');
+    return;
+  }
+
+  const worksheet = workbook.Sheets[firstSheetName];
+  const parsedData = XLSX.utils.sheet_to_json(worksheet, {
+    header: 1,
+    blankrows: false,
+    defval: '',
+    raw: true,
+  })
+      .map((row) => (Array.isArray(row) ? row.map((column) => String(column ?? '').trim()) : []))
+      .filter((row) => row.some((column) => column !== ''));
+
   parsedFileContent.value = parsedData;
-  // Run the onParsed function
   onParsed(onParsedFunctionCache.value);
 };
 
@@ -143,4 +224,4 @@ const onParsed = (onParsedFunction) => {
     showError('No onParsedFunction set');
   }
 };
-</script>
\ No newline at end of file
+</script>
diff --git a/src/components/forms/other/structures/CustomerMassImportDataStructure.vue b/src/components/forms/other/structures/CustomerMassImportDataStructure.vue
new file mode 100644
index 00000000..086ae7e2
--- /dev/null
+++ b/src/components/forms/other/structures/CustomerMassImportDataStructure.vue
@@ -0,0 +1,219 @@
+<script>
+import {
+  clearProgress,
+  getCompleted,
+  getFailed,
+  getPending,
+  getProcessing,
+  getRequestLimit,
+  getResponses,
+  setCompleted,
+  setDataColumns,
+  setDataRows,
+  setFailed,
+  setParsedDataFormatFunction,
+  setPending,
+  setProcessing,
+  setRequestLimit,
+  setResponses,
+  setSaveFunction,
+  setSubtitle,
+  setTitle,
+} from "@/components/forms/other/MassDataInserter.vue";
+import { generateNewColumn } from "@/components/forms/other/functions/manageDataColumns.vue";
+import { columnTypes } from "@/components/forms/other/types/dataColumnsType.vue";
+import { applyColumnProperties } from "@/components/forms/other/types/dataColumn.vue";
+import { authenticatedRequest } from "@/components/session/authenticatedRequest.vue";
+
+const HEADER_ALIASES = {
+  cvr: ["cvr", "vat", "vatnumber", "corporateidentificationnumber"],
+  name: ["navn", "name", "company", "companyname", "firmanavn"],
+  email: ["email", "mail", "e-mail", "invoiceemail", "contactemail"],
+  ean: ["ean"],
+  phone: ["telefon", "telefonnummer", "telefonnummer", "phone", "phonenumber", "customernumber", "kundenummer"],
+};
+
+const normalizeHeader = (value) => {
+  return String(value ?? "")
+      .trim()
+      .toLowerCase()
+      .normalize("NFD")
+      .replace(/[\u0300-\u036f]/g, "")
+      .replace(/[^a-z0-9]/g, "");
+};
+
+const normalizeText = (value) => {
+  const normalized = String(value ?? "").trim();
+  return normalized !== "" ? normalized : null;
+};
+
+const normalizeDigits = (value) => {
+  const digits = String(value ?? "").replace(/\D+/g, "").trim();
+  return digits !== "" ? digits : null;
+};
+
+const resolveHeaderField = (value) => {
+  const normalized = normalizeHeader(value);
+
+  return Object.entries(HEADER_ALIASES).find(([, aliases]) => aliases.includes(normalized))?.[0] || null;
+};
+
+const detectHeaderMap = (row) => {
+  if (!Array.isArray(row)) {
+    return null;
+  }
+
+  const map = {};
+
+  row.forEach((value, index) => {
+    const field = resolveHeaderField(value);
+    if (field && map[field] === undefined) {
+      map[field] = index;
+    }
+  });
+
+  const matchedFields = Object.keys(map);
+  if (matchedFields.length < 2) {
+    return null;
+  }
+
+  if (map.cvr === undefined && map.phone === undefined) {
+    return null;
+  }
+
+  return map;
+};
+
+const extractRowValue = (row, field, headerMap) => {
+  if (Array.isArray(row)) {
+    if (headerMap && headerMap[field] !== undefined) {
+      return row[headerMap[field]] ?? null;
+    }
+
+    const fallbackIndexByField = {
+      cvr: 0,
+      name: 1,
+      email: 2,
+      ean: 3,
+      phone: 4,
+    };
+
+    const fallbackIndex = fallbackIndexByField[field];
+    return fallbackIndex !== undefined ? row[fallbackIndex] ?? null : null;
+  }
+
+  if (row && typeof row === "object") {
+    const aliases = HEADER_ALIASES[field] || [];
+    const keys = [field, ...aliases];
+
+    for (const key of keys) {
+      if (Object.prototype.hasOwnProperty.call(row, key)) {
+        return row[key];
+      }
+    }
+  }
+
+  return null;
+};
+
+const parseRows = (rows) => {
+  const safeRows = Array.isArray(rows) ? rows : [];
+  const headerMap = detectHeaderMap(safeRows[0]);
+  const sourceRows = headerMap ? safeRows.slice(1) : safeRows;
+  const parsedRows = [];
+
+  sourceRows.forEach((row, index) => {
+    const parsedRow = {
+      cvr: normalizeDigits(extractRowValue(row, "cvr", headerMap)),
+      name: normalizeText(extractRowValue(row, "name", headerMap)),
+      email: normalizeText(extractRowValue(row, "email", headerMap)),
+      ean: normalizeDigits(extractRowValue(row, "ean", headerMap)),
+      phone: normalizeDigits(extractRowValue(row, "phone", headerMap)),
+    };
+
+    parsedRow.customer_number = parsedRow.phone;
+
+    if (!parsedRow.cvr && !parsedRow.name && !parsedRow.email && !parsedRow.ean && !parsedRow.phone) {
+      return;
+    }
+
+    parsedRow.id = `customer-import-${index + 1}-${parsedRow.phone || parsedRow.cvr || index + 1}`;
+    parsedRows.push(parsedRow);
+  });
+
+  setDataRows(parsedRows);
+  return parsedRows;
+};
+
+const processPendingCustomers = () => {
+  while (getPending().length > 0 && getProcessing().length < getRequestLimit()) {
+    const object = getPending()[0];
+    setPending(getPending().slice(1));
+    setProcessing([...getProcessing(), object]);
+    processCustomer(object);
+  }
+};
+
+const processCustomer = (object) => {
+  authenticatedRequest("/customers/import", "POST", {
+    customer_number: object.customer_number,
+    phone: object.phone,
+    cvr: object.cvr,
+    name: object.name,
+    email: object.email,
+    ean: object.ean,
+  }).then((response) => {
+    setResponses([
+      ...getResponses(),
+      {
+        object,
+        success: true,
+        data: response.data,
+      },
+    ]);
+    setCompleted([...getCompleted(), object]);
+    setProcessing(getProcessing().filter((processingObject) => processingObject !== object));
+  }).catch((error) => {
+    setResponses([
+      ...getResponses(),
+      {
+        object,
+        success: false,
+        error,
+      },
+    ]);
+    setFailed([...getFailed(), object]);
+    setProcessing(getProcessing().filter((processingObject) => processingObject !== object));
+  }).finally(() => {
+    processPendingCustomers();
+  });
+};
+
+export const init = () => {
+  clearProgress();
+  setDataRows([]);
+  setTitle("Mass Import Customers");
+  setSubtitle("Import or create company customers from spreadsheet rows");
+  setRequestLimit(3);
+
+  setDataColumns([
+    generateNewColumn("cvr", columnTypes.string, applyColumnProperties({ required: true, label: "CVR" })),
+    generateNewColumn("name", columnTypes.string, applyColumnProperties({ required: false, label: "Name" })),
+    generateNewColumn("email", columnTypes.string, applyColumnProperties({ required: false, label: "Email" })),
+    generateNewColumn("ean", columnTypes.string, applyColumnProperties({ required: false, label: "EAN" })),
+    generateNewColumn("phone", columnTypes.string, applyColumnProperties({ required: true, label: "Phone" })),
+  ]);
+
+  setParsedDataFormatFunction((objects) => parseRows(objects));
+
+  setSaveFunction((objects) => {
+    clearProgress();
+    setResponses([]);
+    setPending([...objects]);
+    setProcessing([]);
+    setCompleted([]);
+    setFailed([]);
+    processPendingCustomers();
+  });
+};
+</script>
diff --git a/src/components/session/token/SessionUser/Objects/Vehicles.vue b/src/components/session/token/SessionUser/Objects/Vehicles.vue
index c83cb325..bb442d87 100644
--- a/src/components/session/token/SessionUser/Objects/Vehicles.vue
+++ b/src/components/session/token/SessionUser/Objects/Vehicles.vue
@@ -34,7 +34,7 @@ export const Vehicles = {
       }
     },
     type: {
-      label: t('objects.columns.type'),
+      label: t('vehicles.type'),
       type: "select",
       sortable: true,
       creation: {
@@ -248,4 +248,4 @@ export const Vehicles = {
     );
   },
 };
-</script>
\ No newline at end of file
+</script>
diff --git a/src/i18n/locales/da.json b/src/i18n/locales/da.json
index f2ce5342..c0594e0c 100644
--- a/src/i18n/locales/da.json
+++ b/src/i18n/locales/da.json
@@ -40,7 +40,7 @@
         "role": "IT chef"
       },
       "mads": {
-        "role": "VD"
+        "role": "Direktør"
       },
       "mikkel": {
         "role1": "Grundlægger",
@@ -631,7 +631,7 @@
       "status_barred": "Spærret",
       "status_booking": "Booking",
       "status_unknown": "Ny",
-      "type": "Typ",
+      "type": "Type",
       "unknown": "Ugendt",
       "use": "Brug",
       "variant": "Variant",
@@ -2415,7 +2415,7 @@
       "task": "Opgave",
       "title": "Titel",
       "total_net_amount": "Total netto beløb",
-      "type": "Typ",
+      "type": "Type",
       "updated_at": "Opdateret",
       "url": "URL",
       "user_id": "Bruger ID",
@@ -4143,7 +4143,7 @@
     "self_service": "Selvvask",
     "self_service_placeholder": "Placeholder for køretøjer med selvbetjening",
     "subscriptions_placeholder": "Placeholder for køretøjer med aktive vaskeabonnementer",
-    "type_label": "Typ",
+    "type_label": "Type",
     "vehicle_count_placeholder": "Placeholder for køretøjsantal",
     "vehicle_type": "Vogntype",
     "vehicles_with_self_service": "Køretøjer med selvbetjening",
@@ -4185,7 +4185,7 @@
       "customer": "Kunde",
       "license_plate": "Registreringsnummer",
       "submit": "Lagre",
-      "type": "Typ"
+      "type": "Type"
     },
     "history": "Historik",
     "license_plate": "Registreringsnummer",
@@ -4204,7 +4204,7 @@
     "singular": "Kjøretøy",
     "subtitle": "Administrer kjøretøy",
     "title": "Køretøjer",
-    "type": "Typ",
+    "type": "Type",
     "types": {
       "bus": "Bus",
       "car": "Bil",
diff --git a/tests/e2e/superuser-customers-mass-import.spec.ts b/tests/e2e/superuser-customers-mass-import.spec.ts
new file mode 100644
index 00000000..3b81b38b
--- /dev/null
+++ b/tests/e2e/superuser-customers-mass-import.spec.ts
@@ -0,0 +1,233 @@
+import { Buffer } from "node:buffer";
+import { expect, test, type Page } from "@playwright/test";
+import * as XLSX from "xlsx";
+
+import { seedAuthenticatedState } from "./support/network.js";
+import { isDesktopProject } from "./support/projects";
+
+const json = (body: unknown, status = 200) => ({
+  status,
+  contentType: "application/json",
+  body: JSON.stringify(body),
+});
+
+const buildWorkbookBuffer = () => {
+  const workbook = XLSX.utils.book_new();
+  const worksheet = XLSX.utils.aoa_to_sheet([
+    ["CVR", "Navn", "Email", "EAN", "Telefon nummer"],
+    ["31744520", "SPF-DANMARK A/S", "spf@example.com", "5790000000001", "76964600"],
+    ["26761751", "STEA A/S", "", "", "75773355"],
+  ]);
+
+  XLSX.utils.book_append_sheet(workbook, worksheet, "Customers");
+  return Buffer.from(XLSX.write(workbook, { type: "buffer", bookType: "xlsx" }));
+};
+
+async function gotoCustomersImportPage(page: Page) {
+  const importButton = page.getByTestId("superuser-customers-mass-import-button");
+
+  for (let attempt = 1; attempt <= 3; attempt += 1) {
+    await page.goto("/superuser/customers", { waitUntil: "domcontentloaded" });
+
+    if ((await importButton.count()) > 0) {
+      return importButton;
+    }
+
+    await page.waitForTimeout(1_000 * attempt);
+  }
+
+  return importButton;
+}
+
+test.describe("Superuser customers mass import", () => {
+  test("parses spreadsheet rows with blank middle columns and submits them row-by-row", async ({ page }, testInfo) => {
+    test.skip(!isDesktopProject(testInfo), "Desktop only");
+
+    const importPayloads: Array<Record<string, unknown>> = [];
+
+    await page.route(/https?:\/\/(?:api\.truckwash\.io(?::\d+)?)\/.*/i, async (route) => {
+      const request = route.request();
+      const url = new URL(request.url());
+      const pathname = url.pathname;
+      const method = request.method();
+
+      if (pathname.endsWith("/auth/session") && method === "GET") {
+        await route.fulfill(
+          json({
+            data: {
+              id: 1,
+              customer_number: 12345,
+              group_id: 1,
+              email: "superuser@example.com",
+              phone: {
+                number: "12345678",
+                country_code: 45,
+              },
+              notifications: {
+                wash_certificate_email: null,
+                email_notifications_enabled: true,
+                sms_notifications_enabled: false,
+              },
+              display_name: "E2E Superuser",
+              permissions: ["superuser", "search_customers", "add_user", "user"],
+              economic_customer: [],
+              runtime_config: {
+                economic: {
+                  transaction_draft_customer_number: null,
+                },
+              },
+            },
+          })
+        );
+        return;
+      }
+
+      if (
+        (pathname.endsWith("/auth/recaptcha/pre-check") || pathname.endsWith("/auth/reCAPTCHA/public")) &&
+        method === "GET"
+      ) {
+        await route.fulfill(
+          json({
+            data: {
+              recaptcha: {
+                enabled: false,
+                site_key: "",
+              },
+              rate_limit: {
+                enabled: false,
+                limit: 0,
+                remaining: 0,
+                reset: 0,
+                warning: null,
+              },
+            },
+          })
+        );
+        return;
+      }
+
+      if (pathname.endsWith("/ping") && method === "GET") {
+        await route.fulfill(json({ data: { ok: true } }));
+        return;
+      }
+
+      if (pathname.endsWith("/worker/version") && method === "GET") {
+        await route.fulfill(json({ data: { version: "test-build" } }));
+        return;
+      }
+
+      if (pathname.endsWith("/departments") && method === "GET") {
+        await route.fulfill(json({ data: [{ id: 1, name: "Hvidovre", visible: true }] }));
+        return;
+      }
+
+      if (pathname.endsWith("/customers") && method === "GET") {
+        await route.fulfill(
+          json({
+            data: [
+              {
+                id: 88,
+                customerNumber: 44556677,
+                name: "Existing Customer",
+                email: "existing@example.com",
+                balance: 0,
+                currency: "DKK",
+                barred: false,
+              },
+            ],
+            meta: {
+              pagination: {
+                page: 1,
+                per_page: 100,
+                total: 1,
+              },
+            },
+          })
+        );
+        return;
+      }
+
+      if (pathname.endsWith("/customers/import") && method === "POST") {
+        const body = request.postDataJSON() as Record<string, unknown>;
+        importPayloads.push(body);
+
+        if (String(body.customer_number) === "75773355") {
+          await route.fulfill(
+            json(
+              {
+                data: {
+                  message: "Customer already exists locally and already has a login account.",
+                },
+              },
+              409
+            )
+          );
+          return;
+        }
+
+        await route.fulfill(
+          json({
+            data: {
+              action: "created_customer",
+              message: "Created the customer in e-conomic and imported it locally.",
+              customer_number: Number(body.customer_number),
+              has_account: false,
+            },
+          })
+        );
+        return;
+      }
+
+      await route.fulfill(json({ data: [] }));
+    });
+
+    await seedAuthenticatedState(page, "superuser-customers-import-token");
+
+    const importButton = await gotoCustomersImportPage(page);
+    await expect(importButton).toBeVisible();
+    await importButton.click();
+    await expect(page.getByTestId("mass-data-inserter-modal")).toBeVisible();
+
+    const [fileChooser] = await Promise.all([
+      page.waitForEvent("filechooser"),
+      page.getByTestId("mass-data-insert-add-button").click(),
+    ]);
+
+    await fileChooser.setFiles({
+      name: "customers.xlsx",
+      mimeType: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+      buffer: buildWorkbookBuffer(),
+    });
+
+    const modal = page.getByTestId("mass-data-inserter-modal");
+    await expect(modal).toContainText("SPF-DANMARK A/S");
+    await expect(modal).toContainText("76964600");
+    await expect(modal).toContainText("STEA A/S");
+    await expect(modal).toContainText("75773355");
+
+    await page.getByTestId("mass-data-insert-save-button").click();
+
+    await expect.poll(() => importPayloads.length).toBe(2);
+
+    expect(importPayloads[0]).toMatchObject({
+      cvr: "31744520",
+      name: "SPF-DANMARK A/S",
+      email: "spf@example.com",
+      ean: "5790000000001",
+      phone: "76964600",
+      customer_number: "76964600",
+    });
+
+    expect(importPayloads[1]).toMatchObject({
+      cvr: "26761751",
+      name: "STEA A/S",
+      email: null,
+      ean: null,
+      phone: "75773355",
+      customer_number: "75773355",
+    });
+
+    await expect(modal.locator(".tag.is-success")).toHaveCount(1);
+    await expect(modal.locator(".tag.is-danger")).toHaveCount(1);
+  });
+});
diff --git a/tests/e2e/userVehicles.spec.ts b/tests/e2e/userVehicles.spec.ts
index cb3e0db7..b2b0eab9 100644
--- a/tests/e2e/userVehicles.spec.ts
+++ b/tests/e2e/userVehicles.spec.ts
@@ -1,7 +1,30 @@
-import { expect, test } from "@playwright/test";
+import { expect, test } from "@playwright/test";
 import { loginAsUser } from "./fixtures";
 
+const json = (body, status = 200) => ({
+  status,
+  contentType: "application/json",
+  body: JSON.stringify(body),
+});
+
+const suppressVersionCheck = async (page) => {
+  await page.addInitScript(() => {
+    window.localStorage.setItem("lastVersionCheck", String(Date.now()));
+  });
+
+  await page.route(/\/worker\/version(\?.*)?$/i, async (route) => {
+    await route.fulfill(
+      json({
+        data: {
+          version: "test-build",
+        },
+      })
+    );
+  });
+};
+
 test("[PAGES][User][/user/vehicles] shows the current vehicles overview shell", async ({ page }) => {
+  await suppressVersionCheck(page);
   await loginAsUser(page);
   await page.goto("/user/vehicles");
 
@@ -10,6 +33,7 @@ test("[PAGES][User][/user/vehicles] shows the current vehicles overview shell",
 });
 
 test("[PAGES][User][/user/vehicles] opens the add-vehicle dialog", async ({ page }) => {
+  await suppressVersionCheck(page);
   await loginAsUser(page);
   await page.goto("/user/vehicles");
 
@@ -17,6 +41,7 @@ test("[PAGES][User][/user/vehicles] opens the add-vehicle dialog", async ({ page
   const dialog = page.getByRole("dialog");
   await expect(dialog).toBeVisible();
   await expect(dialog.getByRole("heading", { name: /opret/i })).toBeVisible();
+  await expect(dialog.locator("label").filter({ hasText: /^Type$/ })).toBeVisible();
   await expect(dialog.getByRole("button", { name: /gem/i })).toBeVisible();
   await expect(dialog.getByRole("button", { name: /annuller/i })).toBeVisible();
 });