diff --git a/admin/tool/xmldb/actions/main_view/main_view.class.php b/admin/tool/xmldb/actions/main_view/main_view.class.php
index 7a37f8eb1ad..8071a71530b 100644
--- a/admin/tool/xmldb/actions/main_view/main_view.class.php
+++ b/admin/tool/xmldb/actions/main_view/main_view.class.php
@@ -57,6 +57,7 @@ class main_view extends XMLDBAction {
             'checkforeignkeys' => 'tool_xmldb',
             'checkbigints' => 'tool_xmldb',
             'checkoraclesemantics' => 'tool_xmldb',
+            'reconcilefiles' => 'tool_xmldb',
             'doc' => 'tool_xmldb',
             'filemodifiedoutfromeditor' => 'tool_xmldb',
             'viewxml' => 'tool_xmldb',
@@ -97,6 +98,8 @@ class main_view extends XMLDBAction {
         $b .= '&nbsp;<a href="index.php?action=view_reserved_words">[' . $this->str['reservedwords'] . ']</a>';
         // The docs button
         $b .= '&nbsp;<a href="index.php?action=generate_all_documentation">[' . $this->str['doc'] . ']</a>';
+        // The reconcile XMLDB files button.
+        $b .= '&nbsp;<a href="index.php?action=reconcile_files">[' . $this->str['reconcilefiles'] . ']</a>';
         // The check indexes button
         $b .= '&nbsp;<a href="index.php?action=check_indexes&amp;sesskey=' . sesskey() . '">[' . $this->str['checkindexes'] . ']</a>';
         // The check defaults button
diff --git a/admin/tool/xmldb/actions/reconcile_files/reconcile_files.class.php b/admin/tool/xmldb/actions/reconcile_files/reconcile_files.class.php
new file mode 100644
index 00000000000..7536ad2b6ce
--- /dev/null
+++ b/admin/tool/xmldb/actions/reconcile_files/reconcile_files.class.php
@@ -0,0 +1,124 @@
+<?php
+// This file is part of Moodle - https://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
+
+/**
+ * List all the files needing reconcile because the definitions don't match the XML contents.
+ *
+ * @package    tool_xmldb
+ * @copyright  2022 onwards Eloy Lafuente (stronk7) {@link https://stronk7.com}
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class reconcile_files extends XMLDBAction {
+
+    /**
+     * Init method, every subclass will have its own
+     */
+    public function init() {
+        parent::init();
+
+        // Set own custom attributes.
+        $this->sesskey_protected = false; // This action doesn't need sesskey protection.
+
+        // Get needed strings.
+        $this->loadStrings([
+            'backtomainview' => 'tool_xmldb',
+            'reconcile_files_intro' => 'tool_xmldb',
+            'reconcile_files_no' => 'tool_xmldb',
+            'reconcile_files_yes' => 'tool_xmldb',
+            'searchresults' => 'tool_xmldb',
+        ]);
+    }
+
+    /**
+     * Invoke method, every class will have its own
+     * returns true/false on completion, setting both
+     * errormsg and output as necessary
+     */
+    public function invoke() {
+        parent::invoke();
+
+        $result = true;
+
+        // Set own core attributes.
+        $this->does_generate = ACTION_GENERATE_HTML;
+
+        // These are always here.
+        global $CFG, $XMLDB;
+
+        // Do the job, setting $result as needed.
+
+        // Add link back to home.
+        $b = ' <p class="centerpara">';
+        $b .= '&nbsp;<a href="index.php?action=main_view#lastused">[' . $this->str['backtomainview'] . ']</a>';
+        $b .= '</p>';
+        $this->output .= $b;
+
+        $c = '<p class="centerpara">';
+        $c .= $this->str['reconcile_files_intro'];
+        $c .= '</p>';
+        $this->output .= $c;
+
+        // Get the list of DB directories.
+        $result = $this->launch('get_db_directories');
+        if ($result && !empty($XMLDB->dbdirs)) {
+            $needfix = [];
+            foreach ($XMLDB->dbdirs as $key => $dbdir) {
+                // Verify it exists.
+                if (!file_exists($key . '/install.xml') && !is_readable($key . '/install.xml')) {
+                    continue;
+                }
+
+                // Read the raw contents of the file.
+                $rawcontents = file_get_contents($key . '/install.xml');
+
+                // Load the XMLDB file and its structure.
+                $xmldb = new xmldb_file($key . '/install.xml');
+                $xmldb->loadXMLStructure();
+
+                // Generate the XML contents from the loaded structure.
+                $xmlcontents = $xmldb->getStructure()->xmlOutput();
+
+                if ($rawcontents != $xmlcontents) {
+                    $relpath = str_replace($CFG->dirroot . '/', '', $key) . '/install.xml';
+                    $needfix[] = $relpath;
+                    // Left here on purpose, as a quick way to fix problems. To be
+                    // enabled and run by developers only, uncomment the next line:
+                    // file_put_contents($key . '/install.xml', $xmlcontents);
+                    // (this script won't ever do that officially).
+                }
+            }
+        }
+
+        $r = '<h3 class="main">' . $this->str['searchresults'] . '</h3>';
+        if ($needfix) {
+            $r .= '<h4 class="main">' . $this->str['reconcile_files_yes'] . count($needfix) . '</h4>';
+            $r .= '<ul><li>' . implode('</li><li>', $needfix) . '</li></ul>';
+
+        } else {
+            $r .= '<h4 class="main">' . $this->str['reconcile_files_no'] . '</h4>';
+        }
+
+        // Set the output.
+        $this->output .= $r;
+
+        // Launch postaction if exists (leave this unmodified).
+        if ($this->getPostAction() && $result) {
+            return $this->launch($this->getPostAction());
+        }
+
+        return $result;
+    }
+}
diff --git a/admin/tool/xmldb/lang/en/tool_xmldb.php b/admin/tool/xmldb/lang/en/tool_xmldb.php
index e87983503f1..786de3fc70c 100644
--- a/admin/tool/xmldb/lang/en/tool_xmldb.php
+++ b/admin/tool/xmldb/lang/en/tool_xmldb.php
@@ -176,6 +176,13 @@ $string['persistentfieldscomplete'] = 'The following fields have been added: ';
 $string['persistentfieldsexist'] = 'The following fields already exist: ';
 $string['pluginname'] = 'XMLDB editor';
 $string['primarykeyonlyallownotnullfields'] = 'Primary keys cannot be null';
+$string['reconcilefiles'] = 'Reconcile XMLDB files';
+$string['reconcile_files'] = 'Look for XMLDB files needing reconcile';
+$string['reconcile_files_intro'] = 'This functionality looks for the current contents of all the XMLDB files, verifying that they match the results of generating them from the XMLDB Editor.
+
+A list of files needing to be reconciled (regenerated) will be displayed and the XMLDB Editor should be used to fix them.';
+$string['reconcile_files_no'] = 'All files are ok, no reconcile action needed';
+$string['reconcile_files_yes'] = 'Found files to reconcile: ';
 $string['reserved'] = 'Reserved';
 $string['reservedwords'] = 'Reserved words';
 $string['revert'] = 'Revert';