diff --git a/classes/helper.php b/classes/helper.php
index 9ce6fcc..19e0b65 100644
--- a/classes/helper.php
+++ b/classes/helper.php
@@ -735,8 +735,9 @@ public static function read_last_line(string $filename) {
     /**
      * Takes csv data and replaces all matching strings within the DB
      * @param string $data CSV data to be read.
+     * @param string $type type of replace db || files.
      */
-    public static function handle_replace_csv(string $data) {
+    public static function handle_replace_csv(string $data, string $type = 'db') {
         // Load the CSV content.
         $iid = csv_import_reader::get_new_iid('tool_advancedreplace');
         $csvimport = new csv_import_reader($iid, 'tool_advancedreplace');
@@ -761,7 +762,30 @@ public static function handle_replace_csv(string $data) {
         }
 
         // Check if all required columns are present, and show which ones are missing.
-        $requiredcolumns = ['table', 'column', 'id', 'match', 'replace'];
+        if ($type == 'db') {
+            $requiredcolumns = ['table', 'column', 'id', 'match', 'replace'];
+            // Column indexes.
+            $tableindex = array_search('table', $header);
+            $columnindex = array_search('column', $header);
+            $idindex = array_search('id', $header);
+            $matchindex = array_search('match', $header);
+            $replaceindex = array_search('replace', $header);
+        } else if ($type == 'files') {
+            $requiredcolumns = ['contextid', 'component', 'filearea', 'itemid', 'filepath',
+                'filename', 'replace', 'match', 'mimetype', 'internal'];
+            // Column indexes.
+            $contextidindex = array_search('contextid', $header);
+            $componentindex = array_search('component', $header);
+            $fileareaindex = array_search('filearea', $header);
+            $itemidindex = array_search('itemid', $header);
+            $filepathindex = array_search('filepath', $header);
+            $filenameindex = array_search('filename', $header);
+            $matchindex = array_search('match', $header);
+            $replaceindex = array_search('replace', $header);
+            $mimeindex = array_search('mimetype', $header);
+            $internalindex = array_search('internal', $header);
+        }
+
         $missingcolumns = array_diff($requiredcolumns, $header);
 
         if (!empty($missingcolumns)) {
@@ -777,13 +801,6 @@ public static function handle_replace_csv(string $data) {
         $progress = new progress_bar();
         $progress->create();
 
-        // Column indexes.
-        $tableindex = array_search('table', $header);
-        $columnindex = array_search('column', $header);
-        $idindex = array_search('id', $header);
-        $matchindex = array_search('match', $header);
-        $replaceindex = array_search('replace', $header);
-
         // Read the data and replace the strings.
         $csvimport->init();
         $rowcount = 0;
@@ -792,10 +809,25 @@ public static function handle_replace_csv(string $data) {
             if (empty($record[$replaceindex])) {
                 // Skip if 'replace' is empty.
                 $rowskip++;
-            } else {
+            } else if ($type == 'db') {
                 // Replace the string.
                 self::replace_text_in_a_record($record[$tableindex], $record[$columnindex],
                     $record[$matchindex], $record[$replaceindex], $record[$idindex]);
+            } else if ($type == 'files') {
+                $filerecord = [
+                    'contextid' => $record[$contextidindex],
+                    'component' => $record[$componentindex],
+                    'filearea' => $record[$fileareaindex],
+                    'itemid' => $record[$itemidindex],
+                    'filepath' => $record[$filepathindex],
+                    'filename' => $record[$filenameindex],
+                    'mimetype' => $record[$mimeindex],
+                ];
+
+                if (!self::replace_text_in_file($filerecord, $record[$matchindex], $record[$replaceindex],
+                    $record[$internalindex])) {
+                    $rowskip++;
+                }
             }
 
             // Update the progress bar.
@@ -827,4 +859,101 @@ public static function get_replace_csv_content(int $draftid): string {
         $file = reset($files);
         return $file->get_content();
     }
+
+    /**
+     * Replace a string in a file stored in Moodle's file storage. Supports both normal files and files inside zip archives.
+     *
+     * @param array $filerecord File record
+     * @param string $match The string to search for in the file's contents.
+     * @param string $replace The string to replace the matched string with.
+     * @param string $internal The name of the internal file to modify (only used for zip files).
+     *
+     * @return bool Returns true if the string was replaced and the file updated successfully, false otherwise.
+     */
+    public static function replace_text_in_file(array $filerecord, string $match, string $replace, string $internal): bool {
+        $fs = get_file_storage();
+        $file = $fs->get_file(
+            $filerecord['contextid'],
+            $filerecord['component'],
+            $filerecord['filearea'],
+            $filerecord['itemid'],
+            $filerecord['filepath'],
+            $filerecord['filename']
+        );
+
+        if (!$file) {
+            mtrace(get_string('errorreplacingfilenotfound', 'tool_advancedreplace',
+                ['filename' => $filerecord['filename']]));
+            return false;
+        }
+
+        // Specify tmp filename to avoid unique constraint conflict.
+        $filerecord['filename'] = time();
+
+        if ($filerecord['mimetype'] == 'application/zip' || $filerecord['mimetype'] == 'application/zip.h5p') {
+            $newzip = self::replace_text_in_zip($file, $match, $replace, $internal);
+            $newfile = $fs->create_file_from_pathname($filerecord, $newzip);
+            unlink($newzip);
+        } else {
+
+            $content = $file->get_content();
+            $newcontent = str_replace($match, $replace, $content);
+            $newfile = $fs->create_file_from_string($filerecord, $newcontent);
+        }
+        if ($newfile) {
+            $file->replace_file_with($newfile);
+            $newfile->delete();
+            return true;
+        } else {
+            mtrace(get_string('errorreplacingfile', 'tool_advancedreplace',
+                ['replace' => $match, 'filename' => $filerecord['filepath']]));
+            return false;
+        }
+    }
+
+    /**
+     * Extracts a file by name from a zip archive, replaces a string, and updates the zip file.
+     *
+     * @param \stored_file $zipfile    Name of the file to extract and modify inside the zip.
+     * @param string $searchstring  The string to search for in the file's contents.
+     * @param string $replacestring The string to replace the search string with.
+     * @param string $internalfilename The file name of the internal file to be modified.
+     */
+    public static function replace_text_in_zip(\stored_file $zipfile, string $searchstring,
+                                               string $replacestring, string $internalfilename) {
+
+        // Create a temporary file path for working with the ZIP file.
+        $tempzip = make_request_directory() . '/' . $zipfile->get_filename();
+        $zipfile->copy_content_to($tempzip);
+
+        // Open and modify the ZIP file.
+        $zip = new \ZipArchive();
+        if ($zip->open($tempzip) !== true) {
+            return false;
+        }
+
+        // Check if the target file exists in the zip.
+        $fileindex = $zip->locateName($internalfilename);
+        if ($fileindex === false) {
+            $zip->close();
+            return false;
+        }
+
+        // Extract the target file's content.
+        $filecontent = $zip->getFromIndex($fileindex);
+        if ($filecontent === false) {
+            $zip->close();
+            return false;
+        }
+
+        // Replace the string in the file's contents.
+        $modifiedcontents = str_replace($searchstring, $replacestring, $filecontent);
+
+        // Delete the old file and add the modified file back to the ZIP.
+        $zip->deleteName($internalfilename);
+        $zip->addFromString($internalfilename, $modifiedcontents);
+        $zip->close();
+
+        return $tempzip;
+    }
 }
diff --git a/cli/replace.php b/cli/replace.php
index a780e47..5cd1a4a 100644
--- a/cli/replace.php
+++ b/cli/replace.php
@@ -35,6 +35,7 @@
 
 Options:
 --input=FILE                  Required. Input CSV file produced by find.php in detail mode.
+--type=db                     Type of replace database or in files. Default = 'db'
 -h, --help                    Print out this help.
 
 Example:
@@ -44,6 +45,7 @@
 list($options, $unrecognized) = cli_get_params(
     [
         'input'        => null,
+        'type'         => 'db',
         'help'         => false,
     ],
     [
@@ -63,6 +65,8 @@
     exit(0);
 }
 
+$type = $options['type'] ?? 'db';
+
 try {
     $file = validate_param($options['input'], PARAM_PATH);
 } catch (invalid_parameter_exception $e) {
@@ -77,5 +81,5 @@
 $fp = fopen($file, 'r');
 $data = fread($fp, filesize($file));
 fclose($fp);
-helper::handle_replace_csv($data);
+helper::handle_replace_csv($data, $type);
 exit(0);
diff --git a/file_replace.php b/file_replace.php
new file mode 100644
index 0000000..19c88e5
--- /dev/null
+++ b/file_replace.php
@@ -0,0 +1,71 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Advanced search and replace strings throughout all texts in the whole database
+ *
+ * @package    tool_advancedreplace
+ * @copyright  2024 Catalyst IT Australia Pty Ltd
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+define('NO_OUTPUT_BUFFERING', true); // Progress bar is used here.
+
+use tool_advancedreplace\helper;
+
+require_once(__DIR__ . '/../../../config.php');
+require_once($CFG->libdir . '/adminlib.php');
+require_once($CFG->dirroot . '/lib/csvlib.class.php');
+
+global $CFG;
+$replace       = optional_param('delete', 0, PARAM_INT);
+$confirm      = optional_param('confirm', '', PARAM_BOOL);
+$draftid      = optional_param('draftid', '', PARAM_TEXT);
+
+$url = new moodle_url('/admin/tool/advancedreplace/file_replace.php');
+$PAGE->set_url($url);
+
+admin_externalpage_setup('tool_advancedreplace_search');
+
+$redirect = new moodle_url('/admin/tool/advancedreplace/files.php');
+
+$customdata = [
+    'userid' => $USER->id,
+];
+$form = new \tool_advancedreplace\form\replace($url->out(false), $customdata);
+echo $OUTPUT->header();
+if ($form->is_cancelled()) {
+    redirect($redirect);
+} else if (!(get_config('tool_advancedreplace', 'allowuireplace'))) {
+    echo $OUTPUT->heading(get_string('replacefilespageheader', 'tool_advancedreplace'));
+    echo html_writer::div(get_string('replace_warning', 'tool_advancedreplace',
+        '$CFG->forced_plugin_settings[\'tool_advancedreplace\'][\'allowuireplace\'] = 1;'), 'alert alert-warning');
+} else if ($data = $form->get_data()) {
+    $returnurl = new moodle_url('/admin/tool/advancedreplace/file_replace.php');
+    $optionsyes = array('replace' => $replace, 'confirm' => 1, 'sesskey' => sesskey(), 'draftid' => $data->csvfile);
+    $deleteurl = new moodle_url($url, $optionsyes);
+    $deletebutton = new single_button($deleteurl, get_string('replace', 'tool_advancedreplace'), 'post');
+    echo $OUTPUT->confirm(get_string('replacecheck', 'tool_advancedreplace'), $deletebutton, $returnurl);
+} else if ($confirm && !empty($draftid)) {
+    require_sesskey();
+    $contents = helper::get_replace_csv_content($draftid);
+    helper::handle_replace_csv($contents, 'files');
+} else {
+    // Display form.
+    echo $OUTPUT->heading(get_string('replacefilespageheader', 'tool_advancedreplace'));
+    $form->display();
+}
+
+echo $OUTPUT->footer();
diff --git a/files.php b/files.php
index 1fcd2c6..38dd502 100644
--- a/files.php
+++ b/files.php
@@ -96,7 +96,12 @@
     $url->param('id', 0);
     $newurl = new \moodle_url($url, ['id' => 0]);
     $newbutton = new \single_button($newurl, get_string('newsearch', 'tool_advancedreplace'), 'GET');
+
+    $replaceurl = new moodle_url('/admin/tool/advancedreplace/file_replace.php');
+    $replacebutton = new \single_button($replaceurl, get_string('newreplace', 'tool_advancedreplace'), 'GET');
+
     echo $OUTPUT->render($newbutton);
+    echo $OUTPUT->render($replacebutton);
 }
 
 echo $OUTPUT->footer();
diff --git a/lang/en/tool_advancedreplace.php b/lang/en/tool_advancedreplace.php
index a837a37..fbe43aa 100644
--- a/lang/en/tool_advancedreplace.php
+++ b/lang/en/tool_advancedreplace.php
@@ -32,6 +32,8 @@
 $string['errorregexnotsupported'] = 'Regular expression searches are not supported by this database.';
 $string['errorreplacetextnotsupported'] = 'Replace all text is not supported by this database.';
 $string['errorsearchmethod'] = 'Please choose one of the search methods: plain text or regular expression.';
+$string['errorreplacingfile'] = 'Error replacing string: [{$a->replace}] in file: [{$a->filename}]';
+$string['errorreplacingfilenotfound'] = 'Error replacing string, file: [{$a->filename}] no found';
 $string['eta'] = 'ETA: {$a}';
 $string['excludedtables'] = 'Several tables that don\'t support replacements are not searched. These include configuration, log, events, and session tables.';
 $string['field_actions'] = 'Actions';
@@ -84,12 +86,14 @@
 $string['field_zipfilenames_help'] = 'Regular expression to match subfiles within a zip.';
 $string['field_skipzipfilenames_help'] = 'Regular expression to reject subfiles within a zip.';
 
-$string['filespagename'] = 'Search and Replace in Files';
+$string['filespagename'] = 'Search in Files';
+$string['replacefilespagename'] = 'Replace strings in Files';
 $string['filespageheader'] = 'Search for text in Moodle files';
 $string['lastupdated'] = 'Last updated {$a} ago';
 $string['newsearch'] = 'New search';
 $string['newreplace'] = 'New replace';
 $string['replacepageheader'] = 'Replace text stored in the DB';
+$string['replacefilespageheader'] = 'Replace text stored in files';
 $string['replacepagename'] = 'Replace strings in the Database';
 $string['replace'] = 'Replace';
 $string['replacecheck'] = 'Are you sure you want to replace strings in the Database using the uploaded csv file?';
diff --git a/settings.php b/settings.php
index 84dd0c8..75e66b7 100644
--- a/settings.php
+++ b/settings.php
@@ -58,6 +58,15 @@
         )
     );
 
+    $ADMIN->add(
+        'advancereplacefolder',
+        new admin_externalpage(
+            'tool_advancedreplace_file_replace',
+            get_string('replacefilespagename', 'tool_advancedreplace'),
+            new moodle_url('/admin/tool/advancedreplace/file_replace.php'),
+        )
+    );
+
     $settings->add(new admin_setting_configtextarea('tool_advancedreplace/excludetables',
         get_string('settings:excludetables', 'tool_advancedreplace'),
         get_string('settings:excludetables_help', 'tool_advancedreplace'), '', PARAM_TEXT));