diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/util/AcmeUtils.java b/acme4j-client/src/main/java/org/shredzone/acme4j/util/AcmeUtils.java
index 45581c66..a8d38e02 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/util/AcmeUtils.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/util/AcmeUtils.java
@@ -99,6 +99,17 @@ public final class AcmeUtils {
         return Base64Url.encode(data);
     }
 
+    /**
+     * Base64 decodes to a byte array, using URL style encoding.
+     *
+     * @param base64
+     *            base64 encoded string
+     * @return decoded data
+     */
+    public static byte[] base64UrlDecode(String base64) {
+        return Base64Url.decode(base64);
+    }
+
     /**
      * ASCII encodes a domain name.
      * <p>
diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/util/JSON.java b/acme4j-client/src/main/java/org/shredzone/acme4j/util/JSON.java
index f7fcffc5..a17be6ee 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/util/JSON.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/util/JSON.java
@@ -393,6 +393,19 @@ public final class JSON implements Serializable {
             }
         }
 
+        /**
+         * Returns the value as base64 decoded byte array.
+         *
+         * @return byte array, or {@code null} if the value was not set.
+         */
+        public byte[] asBinary() {
+            if (val == null) {
+                return null;
+            }
+
+            return AcmeUtils.base64UrlDecode(val.toString());
+        }
+
         /**
          * Returns the parsed status.
          *
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/util/AcmeUtilsTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/util/AcmeUtilsTest.java
index 46f92e19..2a1f24c6 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/util/AcmeUtilsTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/util/AcmeUtilsTest.java
@@ -84,6 +84,15 @@ public class AcmeUtilsTest {
         assertThat(base64UrlEncode, is("w6uP8Tcg6K2QR905Rms8iXTlksL6OD1KOWBxTK7wxPI"));
     }
 
+    /**
+     * Test base64 URL decode.
+     */
+    @Test
+    public void testBase64UrlDecode() {
+        byte[] base64UrlDecode = base64UrlDecode("w6uP8Tcg6K2QR905Rms8iXTlksL6OD1KOWBxTK7wxPI");
+        assertThat(base64UrlDecode, is(sha256hash("foobar")));
+    }
+
     /**
      * Test ACE conversion.
      */
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/util/JSONTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/util/JSONTest.java
index 18d102e3..110f8e4b 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/util/JSONTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/util/JSONTest.java
@@ -86,7 +86,7 @@ public class JSONTest {
 
         assertThat(json.keySet(), containsInAnyOrder(
                     "text", "number", "boolean", "uri", "url", "date", "array",
-                    "collect", "status"));
+                    "collect", "status", "binary"));
         assertThat(json.contains("text"), is(true));
         assertThat(json.contains("music"), is(false));
         assertThat(json.get("text"), is(notNullValue()));
@@ -181,6 +181,7 @@ public class JSONTest {
         assertThat(json.get("url").asURL(), is(new URL("http://example.com")));
         assertThat(json.get("date").asInstant(), is(date));
         assertThat(json.get("status").asStatusOrElse(Status.INVALID), is(Status.VALID));
+        assertThat(json.get("binary").asBinary(), is("Chainsaw".getBytes()));
 
         JSON.Array array = json.get("array").asArray();
         assertThat(array.get(0).asString(), is("foo"));
@@ -209,6 +210,7 @@ public class JSONTest {
         assertThat(json.get("none").asInstant(), is(nullValue()));
         assertThat(json.get("none").asObject(), is(nullValue()));
         assertThat(json.get("none").asStatusOrElse(Status.INVALID), is(Status.INVALID));
+        assertThat(json.get("none").asBinary(), is(nullValue()));
 
         try {
             json.get("none").asInt();
diff --git a/acme4j-client/src/test/resources/json.properties b/acme4j-client/src/test/resources/json.properties
index c0a89b7d..cde9df9c 100644
--- a/acme4j-client/src/test/resources/json.properties
+++ b/acme4j-client/src/test/resources/json.properties
@@ -45,7 +45,8 @@ json = \
     "date": "2016-01-08T00:00:00Z",\
     "array": ["foo", 987, [1, 2, 3], {"test": "ok"}],\
     "collect": ["foo", "bar", "barfoo"],\
-    "status": "VALID"\
+    "status": "VALID",\
+    "binary": "Q2hhaW5zYXc"\
   }
 
 newRegistration = \