diff --git a/services/web/scripts/analytics/backfill_hashed_emails.mjs b/services/web/scripts/analytics/backfill_hashed_emails.mjs
new file mode 100644
index 0000000000..8594430bb9
--- /dev/null
+++ b/services/web/scripts/analytics/backfill_hashed_emails.mjs
@@ -0,0 +1,126 @@
+import minimist from 'minimist'
+import logger from '@overleaf/logger'
+import { batchedUpdate } from '@overleaf/mongo-utils/batchedUpdate.js'
+import AnalyticsManager from '../../app/src/Features/Analytics/AnalyticsManager.js'
+import { db } from '../../app/src/infrastructure/mongodb.js'
+import { gracefulShutdown } from '../../app/src/infrastructure/GracefulShutdown.js'
+
+/**
+ * @typedef {(import('../../app/src/Features/Analytics/types').EmailChangePayload)} EmailChangePayload
+ */
+
+async function getConfiguration() {
+  const { commit, endDate, verbose } = minimist(process.argv.slice(2), {
+    boolean: ['commit', 'verbose'],
+    string: ['endDate'],
+  })
+  // Check endDate is valid
+  if (endDate) {
+    if (Number.isNaN(new Date(endDate).getTime())) {
+      logger.error({ endDate }, 'endDate is not a valid date')
+      usage()
+      await shutdown()
+    }
+  }
+  return {
+    commit,
+    endDate,
+    verbose,
+  }
+}
+
+function usage() {
+  console.log(
+    'Usage: node scripts/analytics/backfill_hashed_emails.mjs [--commit] [--endDate date]'
+  )
+  console.log('--commit: actually perform the updates (default: dry run)')
+  console.log('--verbose: enable verbose logging')
+  console.log(
+    '--endDate: only process emails created before this date (ISO format)'
+  )
+}
+
+function processBatch(users) {
+  for (const user of users) {
+    if (user.emails) {
+      for (const emailDocument of user.emails) {
+        if (endDate && emailDocument.createdAt > new Date(endDate)) {
+          logger.debug(
+            {
+              email: emailDocument.email,
+              createdAt: emailDocument.createdAt,
+            },
+            'Skipping email created after endDate'
+          )
+          continue
+        }
+        /** @type {EmailChangePayload} */
+        const payload = {
+          userId: user._id,
+          email: emailDocument.email,
+          createdAt: emailDocument.createdAt,
+          action: 'created',
+          emailConfirmedAt: emailDocument.confirmedAt,
+          emailCreatedAt: emailDocument.createdAt,
+          isPrimary: user.email === emailDocument.email,
+        }
+        logger.debug(
+          {
+            payload,
+            id: user._id,
+            email: emailDocument.email,
+            userEmail: user.email,
+          },
+          'Registering email creation'
+        )
+        if (commit) {
+          AnalyticsManager.registerEmailChange(payload)
+        }
+      }
+    }
+  }
+}
+
+async function shutdown() {
+  await gracefulShutdown()
+}
+
+const { commit, endDate, verbose } = await getConfiguration()
+logger.logger.level(verbose ? 'debug' : 'info')
+
+const query = {}
+
+if (endDate) {
+  logger.debug({ endDate }, 'Processing emails created before endDate')
+  query.emails = {
+    $exists: true,
+    $elemMatch: { createdAt: { $lte: new Date(endDate) } },
+  }
+} else {
+  logger.debug({}, 'Processing all emails')
+}
+
+if (!commit) {
+  logger.info({}, 'Dry run mode (no changes will be made)')
+}
+
+try {
+  const processed = await batchedUpdate(
+    db.users,
+    query,
+    processBatch,
+    {
+      email: 1,
+      emails: 1,
+      _id: 1,
+    },
+    {
+      readPreference: 'secondaryPreferred',
+    }
+  )
+
+  logger.info({ processed }, 'Emails processed')
+} catch (error) {
+  logger.error({ error }, 'Error during processing')
+}
+await shutdown()