diff --git a/onfhir-path/src/main/scala/io/onfhir/path/FhirPathFunctionEvaluator.scala b/onfhir-path/src/main/scala/io/onfhir/path/FhirPathFunctionEvaluator.scala
index d6e4a92f..6c25e9de 100644
--- a/onfhir-path/src/main/scala/io/onfhir/path/FhirPathFunctionEvaluator.scala
+++ b/onfhir-path/src/main/scala/io/onfhir/path/FhirPathFunctionEvaluator.scala
@@ -8,6 +8,7 @@ import org.json4s.JsonAST._
 
 import java.time._
 import java.time.temporal.Temporal
+import java.util.Base64
 import scala.concurrent.Await
 import scala.concurrent.duration.DurationInt
 import scala.language.postfixOps
@@ -856,7 +857,7 @@ class FhirPathFunctionEvaluator(context: FhirPathEnvironment, current: Seq[FhirP
 
 
   /**
-   * String manipulation functions ttp://hl7.org/fhirpath/#string-manipulation
+   * String manipulation functions http://hl7.org/fhirpath/#string-manipulation
    *
    * @return
    */
@@ -1015,6 +1016,13 @@ class FhirPathFunctionEvaluator(context: FhirPathEnvironment, current: Seq[FhirP
     current.headOption.map(c => Seq(FhirPathNumber(c.asInstanceOf[FhirPathString].s.length))).getOrElse(Nil)
   }
 
+  @FhirPathFunction(documentation = "\uD83D\uDCDC Encodes the input string to a Base64-encoded binary.\n\n\uD83D\uDD19 <span style=\"color:#ff0000;\">_@return_</span>\n```\nZmluYWw=\n``` \n\uD83D\uDCA1 **E.g.** 'final'.encode()",
+    insertText = "encode()", detail = "", label = "encode", kind = "Method", returnType = Seq("base64Binary"), inputType = Seq("string"))
+  def encode(): Seq[FhirPathResult] = {
+    checkSingleString()
+    current.headOption.map(c => Seq(FhirPathString(Base64.getEncoder.encodeToString(c.asInstanceOf[FhirPathString].s.getBytes("UTF-8"))))).getOrElse(Nil)
+  }
+
   /**
    * Tree navigation function http://hl7.org/fhirpath/#tree-navigation
    */
diff --git a/onfhir-path/src/test/scala/io/onfhir/path/FhirPathEvaluatorTest.scala b/onfhir-path/src/test/scala/io/onfhir/path/FhirPathEvaluatorTest.scala
index 8120b4f2..736c2cb5 100644
--- a/onfhir-path/src/test/scala/io/onfhir/path/FhirPathEvaluatorTest.scala
+++ b/onfhir-path/src/test/scala/io/onfhir/path/FhirPathEvaluatorTest.scala
@@ -577,6 +577,8 @@ class FhirPathEvaluatorTest extends Specification {
       //length
       FhirPathEvaluator().evaluateNumerical("Observation.performer.display.length()", observation) mustEqual Seq(12)
       FhirPathEvaluator().evaluate("{}", observation) must empty
+      //encode
+      FhirPathEvaluator().evaluateString("Observation.status.encode()", observation).head mustEqual "ZmluYWw="
     }
     "evaluate paths with tree navigation functions" in {
       FhirPathEvaluator().evaluate("Questionnaire.children()", questionnaire).length mustEqual 12