diff --git a/backend/service/templateService.go b/backend/service/templateService.go
index 3d0cad0..8514b76 100644
--- a/backend/service/templateService.go
+++ b/backend/service/templateService.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"bytes"
+	"encoding/base64"
 	"fmt"
 	"html"
 	"html/template"
@@ -431,6 +432,9 @@ func TemplateFuncs() template.FuncMap {
 			goFormat := convertDateFormat(format)
 			return targetTime.Format(goFormat)
 		},
+		"base64": func(s string) string {
+			return base64.StdEncoding.EncodeToString([]byte(s))
+		},
 	}
 }
 
diff --git a/frontend/src/lib/components/editor/Editor.svelte b/frontend/src/lib/components/editor/Editor.svelte
index a3bd88b..2fa57ea 100644
--- a/frontend/src/lib/components/editor/Editor.svelte
+++ b/frontend/src/lib/components/editor/Editor.svelte
@@ -60,7 +60,8 @@
 			{ label: 'URL escape', text: '{{urlEscape "content" }}' },
 			{ label: 'Random alphanumeric', text: '{{randAlpha 8}}' },
 			{ label: 'Random number', text: '{{randInt 1 4}}' },
-			{ label: 'Date', text: '{{date "Y-m-d H:i:s" 0}}' }
+			{ label: 'Date', text: '{{date "Y-m-d H:i:s" 0}}' },
+			{ label: 'Base64', text: '{{base64 "text"}}' }
 		]
 	};
 
@@ -228,6 +229,14 @@
 			});
 		}
 
+		// handle base64 function
+		if (text.includes('{{base64')) {
+			const r = /{{base64\s+"([^"]+)"}}/g;
+			text = text.replace(r, (match, input) => {
+				return btoa(input);
+			});
+		}
+
 		// handle date function with format and optional offset
 		if (text.includes('{{date')) {
 			const r = /{{date\s+"([^"]+)"\s*(-?\d+)?}}/g;