diff --git a/stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/WatermarkController.java b/stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/WatermarkController.java
index fd8f1cf8a..47a53a4f9 100644
--- a/stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/WatermarkController.java
+++ b/stirling-pdf/src/main/java/stirling/software/SPDF/controller/api/security/WatermarkController.java
@@ -170,6 +170,9 @@ public class WatermarkController {
             case "chinese":
                 resourceDir = "static/fonts/SimSun.ttf";
                 break;
+            case "thai":
+                resourceDir = "static/fonts/NotoSansThai-Regular.ttf";
+                break;
             case "roman":
             default:
                 resourceDir = "static/fonts/NotoSans-Regular.ttf";
diff --git a/stirling-pdf/src/main/resources/static/fonts/NotoSansThai-Regular.ttf b/stirling-pdf/src/main/resources/static/fonts/NotoSansThai-Regular.ttf
new file mode 100644
index 000000000..7f72a6e14
Binary files /dev/null and b/stirling-pdf/src/main/resources/static/fonts/NotoSansThai-Regular.ttf differ
diff --git a/stirling-pdf/src/main/resources/templates/security/add-watermark.html b/stirling-pdf/src/main/resources/templates/security/add-watermark.html
index 950985b0a..a556d21fc 100644
--- a/stirling-pdf/src/main/resources/templates/security/add-watermark.html
+++ b/stirling-pdf/src/main/resources/templates/security/add-watermark.html
@@ -38,6 +38,7 @@
                     <option value="japanese">日本語</option>
                     <option value="korean">한국어</option>
                     <option value="chinese">简体中文</option>
+                    <option value="thai">ไทย</option>
                   </select>
                 </div>
                 <div id="watermarkTextGroup" class="mb-3">