diff --git a/phpBB/develop/adjust_sizes.php b/phpBB/develop/adjust_sizes.php
new file mode 100644
index 0000000000..e5d28a14b9
--- /dev/null
+++ b/phpBB/develop/adjust_sizes.php
@@ -0,0 +1,133 @@
+<?php
+/**
+* Only adjust the [size] bbcode tag from pc to percent.
+*
+* You should make a backup from your users, posts and privmsgs table in case something goes wrong
+* Forum descriptions and rules need to be re-submitted manually if they use the [size] tag.
+*
+* Since we limit the match to the sizes from 0 to 29 no newly applied sizes should be affected...
+*/
+die("Please read the first lines of this script for instructions on how to enable it");
+
+set_time_limit(0);
+@ini_set('memory_limit', '128M');
+
+define('IN_PHPBB', true);
+$phpbb_root_path = './../';
+$phpEx = substr(strrchr(__FILE__, '.'), 1);
+include($phpbb_root_path . 'common.'.$phpEx);
+
+// Start session management
+$user->session_begin();
+$auth->acl($user->data);
+$user->setup();
+
+$echos = 0;
+
+// Adjust user signatures
+$sql = 'SELECT user_id, user_sig, user_sig_bbcode_uid
+	FROM ' . USERS_TABLE;
+$result = $db->sql_query($sql);
+
+while ($row = $db->sql_fetchrow($result))
+{
+	$bbcode_uid = $row['user_sig_bbcode_uid'];
+
+	// Only if a bbcode uid is present, the signature present and a size tag used...
+	if ($bbcode_uid && $row['user_sig'] && strpos($row['user_sig'], '[size=') !== false)
+	{
+		$match_size = array('/\[size=[0-7]:' . $bbcode_uid . '\]/', '/\[size=[8-9]:' . $bbcode_uid . '\]/', '/\[size=1[0-2]:' . $bbcode_uid . '\]/', '/\[size=1[3-8]:' . $bbcode_uid . '\]/', '/\[size=(?:[2][0-9]|19):' . $bbcode_uid . '\]/');
+		$replace_size = array('[size=50:' . $bbcode_uid . ']', '[size=85:' . $bbcode_uid . ']', '[size=100:' . $bbcode_uid . ']', '[size=150:' . $bbcode_uid . ']', '[size=200:' . $bbcode_uid . ']');
+		$row['user_sig'] = preg_replace($match_size, $replace_size, $row['user_sig']);
+
+		$sql = 'UPDATE ' . USERS_TABLE . " SET user_sig = '" . $db->sql_escape($row['user_sig']) . "'
+			WHERE user_id = " . $row['user_id'];
+		$db->sql_query($sql);
+
+		if ($echos > 200)
+		{
+			echo '<br />' . "\n";
+			$echos = 0;
+		}
+
+		echo '.';
+		$echos++;
+
+		flush();
+	}
+}
+$db->sql_freeresult($result);
+
+
+// Now adjust posts
+$sql = 'SELECT post_id, post_text, bbcode_uid, enable_bbcode
+	FROM ' . POSTS_TABLE;
+$result = $db->sql_query($sql);
+
+while ($row = $db->sql_fetchrow($result))
+{
+	$bbcode_uid = $row['bbcode_uid'];
+
+	// Only if a bbcode uid is present, bbcode enabled and a size tag used...
+	if ($row['enable_bbcode'] && $bbcode_uid && strpos($row['post_text'], '[size=') !== false)
+	{
+		$match_size = array('/\[size=[0-7]:' . $bbcode_uid . '\]/', '/\[size=[8-9]:' . $bbcode_uid . '\]/', '/\[size=1[0-2]:' . $bbcode_uid . '\]/', '/\[size=1[3-8]:' . $bbcode_uid . '\]/', '/\[size=(?:[2][0-9]|19):' . $bbcode_uid . '\]/');
+		$replace_size = array('[size=50:' . $bbcode_uid . ']', '[size=85:' . $bbcode_uid . ']', '[size=100:' . $bbcode_uid . ']', '[size=150:' . $bbcode_uid . ']', '[size=200:' . $bbcode_uid . ']');
+		$row['post_text'] = preg_replace($match_size, $replace_size, $row['post_text']);
+
+		$sql = 'UPDATE ' . POSTS_TABLE . " SET post_text = '" . $db->sql_escape($row['post_text']) . "'
+			WHERE post_id = " . $row['post_id'];
+		$db->sql_query($sql);
+
+		if ($echos > 200)
+		{
+			echo '<br />' . "\n";
+			$echos = 0;
+		}
+
+		echo '.';
+		$echos++;
+
+		flush();
+	}
+}
+$db->sql_freeresult($result);
+
+// Now to the private messages
+$sql = 'SELECT msg_id, message_text, bbcode_uid, enable_bbcode
+	FROM ' . PRIVMSGS_TABLE;
+$result = $db->sql_query($sql);
+
+while ($row = $db->sql_fetchrow($result))
+{
+	$bbcode_uid = $row['bbcode_uid'];
+
+	// Only if a bbcode uid is present, bbcode enabled and a size tag used...
+	if ($row['enable_bbcode'] && $bbcode_uid && strpos($row['message_text'], '[size=') !== false)
+	{
+		$match_size = array('/\[size=[0-7]:' . $bbcode_uid . '\]/', '/\[size=[8-9]:' . $bbcode_uid . '\]/', '/\[size=1[0-2]:' . $bbcode_uid . '\]/', '/\[size=1[3-8]:' . $bbcode_uid . '\]/', '/\[size=(?:[2][0-9]|19):' . $bbcode_uid . '\]/');
+		$replace_size = array('[size=50:' . $bbcode_uid . ']', '[size=85:' . $bbcode_uid . ']', '[size=100:' . $bbcode_uid . ']', '[size=150:' . $bbcode_uid . ']', '[size=200:' . $bbcode_uid . ']');
+		$row['message_text'] = preg_replace($match_size, $replace_size, $row['message_text']);
+
+		$sql = 'UPDATE ' . PRIVMSGS_TABLE . " SET message_text = '" . $db->sql_escape($row['message_text']) . "'
+			WHERE msg_id = " . $row['msg_id'];
+		$db->sql_query($sql);
+
+		if ($echos > 200)
+		{
+			echo '<br />' . "\n";
+			$echos = 0;
+		}
+
+		echo '.';
+		$echos++;
+
+		flush();
+	}
+}
+$db->sql_freeresult($result);
+
+// Done
+$db->sql_close();
+
+?>
\ No newline at end of file