diff --git a/src/main/java/org/codelibs/fess/app/web/admin/group/AdminGroupAction.java b/src/main/java/org/codelibs/fess/app/web/admin/group/AdminGroupAction.java
index 1cfee224e..6b7a88cf9 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/group/AdminGroupAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/group/AdminGroupAction.java
@@ -238,7 +238,7 @@ public class AdminGroupAction extends FessAdminAction {
         switch (form.crudMode) {
         case CrudMode.CREATE:
             return OptionalEntity.of(new Group()).map(entity -> {
-                entity.setId(Base64.getEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
+                entity.setId(Base64.getUrlEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
                 return entity;
             });
         case CrudMode.EDIT:
diff --git a/src/main/java/org/codelibs/fess/app/web/admin/log/AdminLogAction.java b/src/main/java/org/codelibs/fess/app/web/admin/log/AdminLogAction.java
index 0763bdabf..452ee9e2e 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/log/AdminLogAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/log/AdminLogAction.java
@@ -83,7 +83,7 @@ public class AdminLogAction extends FessAdminAction {
                 stream.filter(entry -> entry.getFileName().toString().endsWith(".log")).forEach(filePath -> {
                     final Map<String, Object> map = new HashMap<>();
                     final String name = filePath.getFileName().toString();
-                    map.put("id", Base64.getEncoder().encodeToString(name.getBytes(StandardCharsets.UTF_8)));
+                    map.put("id", Base64.getUrlEncoder().encodeToString(name.getBytes(StandardCharsets.UTF_8)));
                     map.put("name", name);
                     try {
                         map.put("lastModified", new Date(Files.getLastModifiedTime(filePath).toMillis()));
diff --git a/src/main/java/org/codelibs/fess/app/web/admin/role/AdminRoleAction.java b/src/main/java/org/codelibs/fess/app/web/admin/role/AdminRoleAction.java
index db6434c5f..fa97b123c 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/role/AdminRoleAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/role/AdminRoleAction.java
@@ -192,7 +192,7 @@ public class AdminRoleAction extends FessAdminAction {
         switch (form.crudMode) {
         case CrudMode.CREATE:
             return OptionalEntity.of(new Role()).map(entity -> {
-                entity.setId(Base64.getEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
+                entity.setId(Base64.getUrlEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
                 return entity;
             });
         case CrudMode.EDIT:
diff --git a/src/main/java/org/codelibs/fess/app/web/admin/user/AdminUserAction.java b/src/main/java/org/codelibs/fess/app/web/admin/user/AdminUserAction.java
index d9330c5bd..65299101f 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/user/AdminUserAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/user/AdminUserAction.java
@@ -267,7 +267,7 @@ public class AdminUserAction extends FessAdminAction {
         switch (form.crudMode) {
         case CrudMode.CREATE:
             return OptionalEntity.of(new User()).map(entity -> {
-                entity.setId(Base64.getEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
+                entity.setId(Base64.getUrlEncoder().encodeToString(form.name.getBytes(Constants.CHARSET_UTF_8)));
                 return entity;
             });
         case CrudMode.EDIT:
diff --git a/src/main/java/org/codelibs/fess/dict/DictionaryCreator.java b/src/main/java/org/codelibs/fess/dict/DictionaryCreator.java
index 8b89ebf1e..e88c3b17c 100644
--- a/src/main/java/org/codelibs/fess/dict/DictionaryCreator.java
+++ b/src/main/java/org/codelibs/fess/dict/DictionaryCreator.java
@@ -39,7 +39,7 @@ public abstract class DictionaryCreator {
     }
 
     protected String encodePath(final String path) {
-        return Base64.getEncoder().encodeToString(path.getBytes(Constants.CHARSET_UTF_8));
+        return Base64.getUrlEncoder().encodeToString(path.getBytes(Constants.CHARSET_UTF_8));
     }
 
     protected boolean isTarget(final String path) {
diff --git a/src/main/java/org/codelibs/fess/ldap/LdapManager.java b/src/main/java/org/codelibs/fess/ldap/LdapManager.java
index 4106a74f1..f7bd3138b 100644
--- a/src/main/java/org/codelibs/fess/ldap/LdapManager.java
+++ b/src/main/java/org/codelibs/fess/ldap/LdapManager.java
@@ -333,9 +333,9 @@ public class LdapManager {
                         processSearchRoles(result, (entryDn, name) -> {
                             final String lowerEntryDn = entryDn.toLowerCase(Locale.ROOT);
                             if (lowerEntryDn.indexOf(lowerGroupDn) != -1) {
-                                groupList.add(Base64.getEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
+                                groupList.add(Base64.getUrlEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
                             } else if (lowerEntryDn.indexOf(lowerRoleDn) != -1) {
-                                roleList.add(Base64.getEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
+                                roleList.add(Base64.getUrlEncoder().encodeToString(name.getBytes(Constants.CHARSET_UTF_8)));
                             }
                         });
                         user.setGroups(groupList.toArray(new String[groupList.size()]));