diff --git a/inc/Service/SecureimageCaptchaQuery.php b/inc/Service/SecureimageCaptchaQuery.php
index f5023899..0b33c059 100644
--- a/inc/Service/SecureimageCaptchaQuery.php
+++ b/inc/Service/SecureimageCaptchaQuery.php
@@ -10,19 +10,16 @@ class SecureImageCaptchaQuery {
 	private HttpDriver $http;
 	private string $domain;
 	private string $provider_check;
-	private string $extra;
 
 	/**
 	 * @param HttpDriver $http The http client.
 	 * @param string $domain The server's domain.
 	 * @param string $provider_check Path to the endpoint.
-	 * @param string $extra Extra http parameters.
 	 */
-	function __construct(HttpDriver $http, string $domain, string $provider_check, string $extra) {
+	function __construct(HttpDriver $http, string $domain, string $provider_check) {
 		$this->http = $http;
 		$this->domain = $domain;
 		$this->provider_check = $provider_check;
-		$this->extra = $extra;
 	}
 
 	/**
@@ -37,11 +34,12 @@ class SecureImageCaptchaQuery {
 		$data = [
 			'mode' => 'check',
 			'text' => $user_text,
-			'extra' => $this->extra,
 			'cookie' => $user_cookie
 		];
 
 		$ret = $this->http->requestGet($this->domain . '/' . $this->provider_check, $data);
-		return $ret === '1';
+		$resp = \json_decode($ret, true, 16, \JSON_THROW_ON_ERROR);
+
+		return isset($resp['success']) && $resp['success'];
 	}
 }
diff --git a/inc/config.php b/inc/config.php
index f177f9e1..5f9b7130 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -384,13 +384,18 @@
 		// To enable the native captcha you need to change a couple of settings. Read more at: /inc/captcha/readme.md
 		'native' => [
 			// Custom captcha get provider path (if not working get the absolute path aka your url).
-			'provider_get' => '../inc/captcha/entrypoint.php',
+			'provider_get' => 'securimage.php',
 			// Custom captcha check provider path
-			'provider_check' => '../inc/captcha/entrypoint.php',
+			'provider_check' => 'securimage.php',
 			// Custom captcha extra field (eg. charset)
 			'extra' => 'abcdefghijklmnopqrstuvwxyz',
 			// New thread captcha. Require solving a captcha to post a thread.
-			'new_thread_capt' => false
+			'new_thread_capt' => false,
+			// Securimage customization options
+			// https://github.com/dapphp/securimage/blob/nextgen/examples/securimage_show_example.php#L49
+			'securimage_options' => ['send_headers' => false, 'no_exit' => true],
+			// Captcha expires (in seconds)
+			'expires_in' => 320
 		]
 	];
 
diff --git a/inc/context.php b/inc/context.php
index d1f74551..63557227 100644
--- a/inc/context.php
+++ b/inc/context.php
@@ -86,8 +86,7 @@ function build_context(array $config): Context {
 			return new SecureImageCaptchaQuery(
 				$c->get(HttpDriver::class),
 				$config['domain'],
-				$config['captcha']['native']['provider_check'],
-				$config['captcha']['native']['extra']
+				$config['captcha']['native']['provider_check']
 			);
 		},
 		CacheDriver::class => function($c) {
diff --git a/js/captcha.js b/js/captcha.js
index 5e0bcf53..b0589d24 100644
--- a/js/captcha.js
+++ b/js/captcha.js
@@ -1,27 +1,27 @@
 var tout;
 
-function redo_events(provider, extra) {
-  $('.captcha .captcha_text, textarea[id="body"]').off("focus").one("focus", function() { actually_load_captcha(provider, extra); });
+function redo_events(provider) {
+  $('.captcha .captcha_text, textarea[id="body"]').off("focus").one("focus", function() { actually_load_captcha(provider); });
 }
 
-function actually_load_captcha(provider, extra) {
+function actually_load_captcha(provider) {
   $('.captcha .captcha_text, textarea[id="body"]').off("focus");
 
   if (tout !== undefined) {
     clearTimeout(tout);
   }
 
-  $.getJSON(provider, {mode: 'get', extra: extra}, function(json) {
+  $.getJSON(provider, {mode: 'get'}, function(json) {
     $(".captcha .captcha_cookie").val(json.cookie);
     $(".captcha .captcha_html").html(json.captchahtml);
 
     setTimeout(function() {
-      redo_events(provider, extra);      
+      redo_events(provider);      
     }, json.expires_in * 1000);
   });
 }
 
-function load_captcha(provider, extra) {
+function load_captcha(provider) {
   $(function() {
     $(".captcha>td").html("<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>"+
 			  "<input class='captcha_cookie' name='captcha_cookie' type='hidden'>"+
@@ -29,15 +29,15 @@ function load_captcha(provider, extra) {
 
     $("#quick-reply .captcha .captcha_text").prop("placeholder", _("Verification"));
 
-    $(".captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
-    $(document).on("ajax_after_post",       function() { actually_load_captcha(provider, extra); });
-    redo_events(provider, extra);
+    $(".captcha .captcha_html").on("click", function() { actually_load_captcha(provider); });
+    $(document).on("ajax_after_post",       function() { actually_load_captcha(provider); });
+    redo_events(provider);
 
     $(window).on("quick-reply", function() {
-      redo_events(provider, extra);
+      redo_events(provider);
       $("#quick-reply .captcha .captcha_html").html($("form:not(#quick-reply) .captcha .captcha_html").html());
       $("#quick-reply .captcha .captcha_cookie").val($("form:not(#quick-reply) .captcha .captcha_cookie").html());
-      $("#quick-reply .captcha .captcha_html").on("click", function() { actually_load_captcha(provider, extra); });
+      $("#quick-reply .captcha .captcha_html").on("click", function() { actually_load_captcha(provider); });
     });
   });
 }
diff --git a/post.php b/post.php
index 2dcfe294..17ee95c5 100644
--- a/post.php
+++ b/post.php
@@ -517,12 +517,7 @@ if (isset($_POST['delete'])) {
 		}
 
 		try {
-			$query = new SecureImageCaptchaQuery(
-				$context->get(HttpDriver::class),
-				$config['domain'],
-				$config['captcha']['provider_check'],
-				$config['captcha']['extra']
-			);
+			$query = $context->get(SecureImageCaptchaQuery::class);
 			$success = $query->verify(
 				$_POST['captcha_text'],
 				$_POST['captcha_cookie']
@@ -632,22 +627,22 @@ if (isset($_POST['delete'])) {
 			$dynamic = $config['captcha']['dynamic'];
 
 			// With our custom captcha provider
-			if (($provider === 'native' && !$new_thread_capt)
-				|| ($provider === 'native' && $new_thread_capt && $post['op'])) {
-				$query = $context->get(SecureImageCaptchaQuery::class);
-				$success = $query->verify($_POST['captcha_text'], $_POST['captcha_cookie']);
+			if ($provider === 'native') {
+				if ((!$new_thread_capt && !$post['op']) || ($new_thread_capt && $post['op'])) {
+					$query = $context->get(SecureImageCaptchaQuery::class);
+					$success = $query->verify($_POST['captcha_text'], $_POST['captcha_cookie']);
 
-				if (!$success) {
-					error(
-						"{$config['error']['captcha']}
-						<script>
-							if (actually_load_captcha !== undefined)
-								actually_load_captcha(
-									\"{$config['captcha']['provider_get']}\",
-									\"{$config['captcha']['extra']}\"
-								);
-						</script>"
-					);
+					if (!$success) {
+						error(
+							"{$config['error']['captcha']}
+							<script>
+								if (actually_load_captcha !== undefined)
+									actually_load_captcha(
+										\"{$config['captcha']['provider_get']}\"
+									);
+							</script>"
+						);
+					}
 				}
 			}
 			// Remote 3rd party captchas.
diff --git a/securimage.php b/securimage.php
index 324ffe44..8ebfa154 100644
--- a/securimage.php
+++ b/securimage.php
@@ -1,73 +1,88 @@
 <?php
 require_once('inc/bootstrap.php');
-$expires_in = 120;
 
-function rand_string($length, $charset) {
-	$ret = "";
+function rand_string(int $length, string $charset): string {
+	$ret = '';
 	while ($length--) {
 		$ret .= mb_substr($charset, rand(0, mb_strlen($charset, 'utf-8')-1), 1, 'utf-8');
 	}
 	return $ret;
 }
 
-function cleanup() {
-	global $expires_in;
+function cleanup(int $expires_in): void {
 	prepare("DELETE FROM `captchas` WHERE `created_at` < ?")->execute([time() - $expires_in]);
 }
 
+function handleGetRequestCaptcha(array $config): void {
+	$extra = $config['captcha']['native']['extra'];
+	$cookie = rand_string(20, $extra);
 
-$mode = @$_GET['mode'];
-switch ($mode) {
+	$securimage = new Securimage($config['captcha']['native']['securimage_options']);
+	$securimage->createCode();
+
+	ob_start();
+	$securimage->show();
+	$rawImage = ob_get_clean();
+
+	$base64Image = 'data:image/png;base64,' . base64_encode($rawImage);
+	$html = '<img src="' . $base64Image . '">';
+	$captchaCode = $securimage->getCode();
+
+	prepare("INSERT INTO `captchas` (`cookie`, `extra`, `text`, `created_at`) VALUES (?, ?, ?, ?)")
+		->execute([$cookie, $extra, $captchaCode->code_display, $captchaCode->creationTime]);
+
+	if (isset($_GET['raw'])) {
+		$_SESSION['captcha_cookie'] = $cookie;
+		header('Content-Type: image/png');
+		echo $rawImage;
+	} else {
+		header("Content-Type: application/json");
+		echo json_encode([
+			"cookie" => $cookie,
+			"captchahtml" => $html,
+			"expires_in" => $config['captcha']['native']['expires_in'],
+		]);
+	}
+}
+
+function handleCheckRequestCaptcha(int $expires_in): void {
+	cleanup($expires_in);
+
+	$cookie = $_GET['cookie'] ?? null;
+	$text = $_GET['text'] ?? null;
+
+	if (!$cookie || !$text) {
+		echo json_encode(["success" => false]);
+		return;
+	}
+
+	$query = prepare("SELECT * FROM `captchas` WHERE `cookie` = ?");
+	$query->execute([$cookie]);
+	$captchaData = $query->fetchAll();
+
+	if (!$captchaData) {
+		echo json_encode(["success" => false]);
+		return;
+	}
+
+	prepare("DELETE FROM `captchas` WHERE `cookie` = ?")->execute([$cookie]);
+
+	$isSuccessful = $captchaData[0]['text'] === $text;
+	echo json_encode(["success" => $isSuccessful]);
+}
+
+$mode = $_GET['mode'] ?? null;
+
+switch($mode) {
 	case 'get':
-		if (!isset ($_GET['extra'])) {
-			$_GET['extra'] = $config['captcha']['extra'];
-		}
-
-		header("Content-type: application/json");
-		$extra = $_GET['extra'];
-		$cookie = rand_string(20, "abcdefghijklmnopqrstuvwxyz");
-		$i = new Securimage(['send_headers' => false, 'no_exit' => true]);
-		$i->createCode();
-		ob_start();
-		$i->show();
-		$rawimg = ob_get_contents();
-		$b64img = 'data:image/png;base64,'.base64_encode($rawimg);
-		$html = '<img src="'.$b64img.'">';
-		ob_end_clean();
-		$cdata = $i->getCode();
-		$query = prepare("INSERT INTO `captchas` (`cookie`, `extra`, `text`, `created_at`) VALUES (?, ?, ?, ?)");
-		$query->execute([$cookie, $extra, $cdata->code_display, $cdata->creationTime]);
-		if (isset($_GET['raw'])) {
-			$_SESSION['captcha_cookie'] = $cookie;
-			header('Content-Type: image/png');
-			echo $rawimg;
-		} else {
-			echo json_encode(["cookie" => $cookie, "captchahtml" => $html, "expires_in" => $expires_in]);
-		}
+		handleGetRequestCaptcha($config);
 		break;
 	case 'check':
-		cleanup();
-		if (!isset ($_GET['mode']) || !isset ($_GET['cookie']) || !isset ($_GET['extra']) || !isset ($_GET['text'])) {
-			die();
-		}
-
-		$query = prepare("SELECT * FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
-		$query->execute([$_GET['cookie'], $_GET['extra']]);
-
-		$ary = $query->fetchAll();
-
-		if (!$ary) { // captcha expired
-			echo "0";
-			break;
-		} else {
-			$query = prepare("DELETE FROM `captchas` WHERE `cookie` = ? AND `extra` = ?");
-			$query->execute([$_GET['cookie'], $_GET['extra']]);
-		}
-
-		if ($ary[0]['text'] !== $_GET['text']) {
-			echo "0";
-		} else {
-			echo "1";
-		}
+		handleCheckRequestCaptcha($config['captcha']['native']['expires_in']);
 		break;
-}
+	case '':
+	default:
+		http_response_code(400);
+		echo json_encode(["success" => false, "error" => "Invalid mode"]);
+		break;
+}
\ No newline at end of file
diff --git a/templates/post_form.html b/templates/post_form.html
index b0377e03..1095b4ae 100644
--- a/templates/post_form.html
+++ b/templates/post_form.html
@@ -100,38 +100,22 @@
 			</td>
 		</tr>
 		{% endif %}
-		{% if config.captcha.provider == 'native' %}
-		<tr class='captcha'>
-			<th>
-				{% trans %}Verification{% endtrans %}
-			</th>
-			<td>
-				<script>load_captcha("{{ config.captcha.native.provider_get }}", "{{ config.captcha.native.extra }}");</script>
-				<noscript>
-					<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>
-					<div class="captcha_html">
-						<img src="/{{ config.captcha.native.provider_get }}?mode=get&raw=1">
-					</div>
-				</noscript>
-			</td>
-		</tr>
-		{% elseif config.captcha.native.new_thread_capt %}
-			{% if not id %}
- 			<tr class='captcha'>
-                        <th>
-                                {% trans %}Verification{% endtrans %}
-                        </th>
-                        <td>
-                                <script>load_captcha("{{ config.captcha.native.provider_get }}", "{{ config.captcha.native.extra }}");</script>
-				<noscript>
-					<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>
-					<div class="captcha_html">
-						<img src="/{{ config.captcha.native.provider_get }}?mode=get&raw=1">
-					</div>
-				</noscript>
-                        </td>
-                	</tr>
-			{% endif %}
+		{% if (config.captcha.provider == 'native' and not config.captcha.native.new_thread_capt) or 
+			(config.captcha.provider == 'native' and config.captcha.native.new_thread_capt and not id) %}
+			<tr class='captcha'>
+				<th>
+					{% trans %}Verification{% endtrans %}
+				</th>
+				<td>
+					<script>load_captcha("{{ config.captcha.native.provider_get }}");</script>
+					<noscript>
+						<input class='captcha_text' type='text' name='captcha_text' size='32' maxlength='6' autocomplete='off'>
+						<div class="captcha_html">
+							<img src="/{{ config.captcha.native.provider_get }}?mode=get&raw=1">
+						</div>
+					</noscript>
+				</td>
+			</tr>
 		{% endif %}
 		{% if config.user_flag %}
 			<tr>