diff --git a/application/Espo/Tools/Export/Format/Csv/Processor.php b/application/Espo/Tools/Export/Format/Csv/Processor.php
index 585134fb63..8235491ac1 100644
--- a/application/Espo/Tools/Export/Format/Csv/Processor.php
+++ b/application/Espo/Tools/Export/Format/Csv/Processor.php
@@ -37,6 +37,7 @@ use Espo\Tools\Export\Collection;
 use Espo\Tools\Export\Processor as ProcessorInterface;
 use Espo\Tools\Export\Processor\Params;
 
+use Espo\Tools\Export\Processor\Util;
 use Psr\Http\Message\StreamInterface;
 use GuzzleHttp\Psr7\Stream;
 
@@ -98,26 +99,9 @@ class Processor implements ProcessorInterface
 
             $value = (string) $value;
 
-            $preparedRow[] = $this->sanitizeCellValue($value);
+            $preparedRow[] = Util::sanitizeCellValue($value);
         }
 
         return $preparedRow;
     }
-
-    private function sanitizeCellValue(string $value): string
-    {
-        if ($value === '') {
-            return $value;
-        }
-
-        if (is_numeric($value)) {
-            return $value;
-        }
-
-        if (in_array($value[0], ['+', '-', '@', '='])) {
-            return "'" . $value;
-        }
-
-        return $value;
-    }
 }
diff --git a/application/Espo/Tools/Export/Format/Xlsx/OpenSpoutProcessor.php b/application/Espo/Tools/Export/Format/Xlsx/OpenSpoutProcessor.php
index fd35da19b0..8314267c09 100644
--- a/application/Espo/Tools/Export/Format/Xlsx/OpenSpoutProcessor.php
+++ b/application/Espo/Tools/Export/Format/Xlsx/OpenSpoutProcessor.php
@@ -43,6 +43,7 @@ use Espo\Tools\Export\Format\CellValuePreparatorFactory;
 use Espo\Tools\Export\Processor as ProcessorInterface;
 use Espo\Tools\Export\Processor\Params;
 
+use Espo\Tools\Export\Processor\Util;
 use GuzzleHttp\Psr7\Stream;
 use LogicException;
 use OpenSpout\Common\Entity\Cell;
@@ -174,7 +175,7 @@ class OpenSpoutProcessor implements ProcessorInterface
             ->prepare($entity, $name);
 
         if (is_string($value)) {
-            $value = $this->sanitizeCellValue($value);
+            $value = Util::sanitizeCellValue($value);
 
             return Cell\StringCell::fromValue($value);
         }
@@ -275,21 +276,4 @@ class OpenSpoutProcessor implements ProcessorInterface
 
         return '[$' . $currencySymbol . '-409]#,##0.00;-[$' . $currencySymbol . '-409]#,##0.00';
     }
-
-    private function sanitizeCellValue(string $value): string
-    {
-        if ($value === '') {
-            return $value;
-        }
-
-        if (is_numeric($value)) {
-            return $value;
-        }
-
-        if (in_array($value[0], ['+', '-', '@', '='])) {
-            return "'" . $value;
-        }
-
-        return $value;
-    }
 }
diff --git a/application/Espo/Tools/Export/Format/Xlsx/PhpSpreadsheetProcessor.php b/application/Espo/Tools/Export/Format/Xlsx/PhpSpreadsheetProcessor.php
index 773d585e20..84792c74e9 100644
--- a/application/Espo/Tools/Export/Format/Xlsx/PhpSpreadsheetProcessor.php
+++ b/application/Espo/Tools/Export/Format/Xlsx/PhpSpreadsheetProcessor.php
@@ -49,6 +49,7 @@ use Espo\Tools\Export\Format\CellValuePreparatorFactory;
 use Espo\Tools\Export\Processor as ProcessorInterface;
 use Espo\Tools\Export\Processor\Params;
 
+use Espo\Tools\Export\Processor\Util;
 use Psr\Http\Message\StreamInterface;
 use GuzzleHttp\Psr7\Stream;
 
@@ -625,19 +626,7 @@ class PhpSpreadsheetProcessor implements ProcessorInterface
             return $value;
         }
 
-        if ($value === '') {
-            return $value;
-        }
-
-        if (is_numeric($value)) {
-            return $value;
-        }
-
-        if (in_array($value[0], ['+', '-', '@', '='])) {
-            return "'" . $value;
-        }
-
-        return $value;
+        return Util::sanitizeCellValue($value);
     }
 
     private function sanitizeUrl(string $value): ?string
diff --git a/application/Espo/Tools/Export/Processor/Util.php b/application/Espo/Tools/Export/Processor/Util.php
new file mode 100644
index 0000000000..dd276cdd04
--- /dev/null
+++ b/application/Espo/Tools/Export/Processor/Util.php
@@ -0,0 +1,55 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Export\Processor;
+
+/**
+ * @internal
+ */
+class Util
+{
+    public static function sanitizeCellValue(string $value): string
+    {
+        if ($value === '') {
+            return $value;
+        }
+
+        if (is_numeric($value)) {
+            return $value;
+        }
+
+        $trimmed = ltrim($value, " \t\r\n\v\0");
+
+        if ($trimmed !== '' && in_array($trimmed[0], ['+', '-', '@', '='])) {
+            return "'" . $value;
+        }
+
+        return $value;
+    }
+}