diff --git a/agent/contact.php b/agent/contact.php
index 111fb629..878865c8 100644
--- a/agent/contact.php
+++ b/agent/contact.php
@@ -1044,7 +1044,7 @@ if (isset($_GET['contact_id'])) {
                                 $file_name = escapeHtml($row['file_name']);
                                 $file_description = escapeHtml($row['file_description']);
                                 $file_size = escapeHtml($row['file_size']);
-                                $file_size_KB = round($file_size / 1024);
+                                $file_size_human = formatBytes($file_size);
                                 $file_mime_type = escapeHtml($row['file_mime_type']);
                                 $file_created_at = escapeHtml($row['file_created_at']);
 
@@ -1058,7 +1058,7 @@ if (isset($_GET['contact_id'])) {
                                         <div class="text-secondary"><?php echo $file_description; ?></div>
                                     </td>
                                     <td><?php echo $file_mime_type; ?></td>
-                                    <td><span class="text-monospace"><?php echo $file_size_KB; ?></span> KB</td>
+                                    <td class="text-monospace"><?= $file_size_human ?></td>
                                     <td><?php echo $file_created_at; ?></td>
                                     <td class="text-center">
                                         <a href="post.php?unlink_contact_from_file&contact_id=<?php echo $contact_id; ?>&file_id=<?php echo $file_id; ?>&csrf_token=<?= $_SESSION['csrf_token'] ?>" class="btn btn-secondary btn-sm" title="Unlink"><i class="fas fa-fw fa-unlink"></i></a>
diff --git a/agent/files.php b/agent/files.php
index 9054f939..eb9ddbdb 100644
--- a/agent/files.php
+++ b/agent/files.php
@@ -598,7 +598,7 @@ $num_root_items = intval($row_root_files['num']) + intval($row_root_docs['num'])
                             $file_reference_name= escapeHtml($row['file_reference_name']);
                             $file_ext           = escapeHtml($row['file_ext']);
                             $file_size          = intval($row['file_size']);
-                            $file_size_KB       = number_format($file_size / 1024);
+                            $file_size_human    = formatBytes($file_size);
                             $file_mime_type     = escapeHtml($row['file_mime_type']);
                             $file_uploaded_by   = escapeHtml($row['user_name']);
                             $file_archived_at   = escapeHtml($row['file_archived_at']);
@@ -722,11 +722,11 @@ $num_root_items = intval($row_root_files['num']) + intval($row_root_docs['num'])
                                         $file_reference_name= $item['reference_name'];
                                         $file_icon          = $item['icon'];
                                         $file_size          = $item['size'];
-                                        $file_size_KB       = $file_size ? number_format($file_size / 1024) : 0;
+                                        $file_size_human    = formatBytes($file_size);
                                         $file_mime_type     = $item['mime'];
                                         $file_uploaded_by   = $item['created_by'];
                                         $file_created_at    = $item['created_at'];
-                                        $file_archived_at    = $item['archived_at'];
+                                        $file_archived_at   = $item['archived_at'];
 
                                         // Shared?
                                         $sql_shared = mysqli_query(
@@ -768,7 +768,7 @@ $num_root_items = intval($row_root_files['num']) + intval($row_root_docs['num'])
                                                 </a>
                                             </td>
                                             <td><?php echo $file_mime_type; ?></td>
-                                            <td><?php echo $file_size_KB; ?> KB</td>
+                                            <td><?php echo $file_size_human; ?></td>
                                             <td>
                                                 <?php echo $file_created_at; ?>
                                                 <div class="text-secondary mt-1"><?php echo $file_uploaded_by; ?></div>
diff --git a/agent/modals/contact/contact.php b/agent/modals/contact/contact.php
index 9807c735..eef8d87c 100644
--- a/agent/modals/contact/contact.php
+++ b/agent/modals/contact/contact.php
@@ -825,7 +825,7 @@ ob_start();
                                 $file_name = escapeHtml($row['file_name']);
                                 $file_description = escapeHtml($row['file_description']);
                                 $file_size = escapeHtml($row['file_size']);
-                                $file_size_KB = round($file_size / 1024);
+                                $file_size_human = formatBytes($file_size);
                                 $file_mime_type = escapeHtml($row['file_mime_type']);
                                 $file_created_at = escapeHtml($row['file_created_at']);
 
@@ -839,7 +839,7 @@ ob_start();
                                         <div class="text-secondary"><?= $file_description ?></div>
                                     </td>
                                     <td><?= $file_mime_type ?></td>
-                                    <td><?= $file_size_KB ?> KB</td>
+                                    <td class="text-monospace"><?= $file_size_human ?></td>
                                     <td><?= $file_created_at ?></td>
                                 </tr>
                                 <?php
diff --git a/client/functions.php b/client/functions.php
index e1410022..53c084ee 100644
--- a/client/functions.php
+++ b/client/functions.php
@@ -69,16 +69,3 @@ function getFileIcon($file_extension) {
         return 'file';
     }
 }
-
-/*
- * Formats bytes into human readable file sizes
- */
-function formatBytes($bytes, $precision = 2) {
-    $units = array('B', 'KB', 'MB', 'GB', 'TB');
-
-    for ($i = 0; $bytes > 1024 && $i < count($units) - 1; $i++) {
-        $bytes /= 1024;
-    }
-
-    return round($bytes, $precision) . ' ' . $units[$i];
-}
diff --git a/functions/format.php b/functions/format.php
index bc719028..d400d65f 100644
--- a/functions/format.php
+++ b/functions/format.php
@@ -328,3 +328,16 @@ function validateDate($date) {
     }
     return date('Y-m-d'); // Fallback
 }
+
+/*
+ * Formats bytes into human readable file sizes
+ */
+function formatBytes($bytes, $precision = 2) {
+    $units = array('B', 'KB', 'MB', 'GB', 'TB');
+
+    for ($i = 0; $bytes > 1024 && $i < count($units) - 1; $i++) {
+        $bytes /= 1024;
+    }
+
+    return round($bytes, $precision) . ' ' . $units[$i];
+}