diff --git a/src/inc/routes/register.mjs b/src/inc/routes/register.mjs
index 58ada39..640bdb8 100644
--- a/src/inc/routes/register.mjs
+++ b/src/inc/routes/register.mjs
@@ -88,8 +88,9 @@ export default (router, tpl) => {
             return renderError("Passwords do not match.");
         }
 
-        // reCAPTCHA verification
-        if (cfg.recaptcha?.enabled && cfg.recaptcha?.secret_key) {
+        // reCAPTCHA verification (bypassed for .onion requests as Google reCAPTCHA cannot validate .onion domains)
+        const isOnion = req.headers['host']?.endsWith('.onion');
+        if (!isOnion && cfg.recaptcha?.enabled && cfg.recaptcha?.secret_key) {
             const rcToken = req.post['g-recaptcha-response'];
             if (!rcToken) return renderError("Please complete the reCAPTCHA.");
             try {
diff --git a/src/index.mjs b/src/index.mjs
index 6695f6c..bf9dcf7 100644
--- a/src/index.mjs
+++ b/src/index.mjs
@@ -1496,6 +1496,9 @@ process.on('uncaughtException', err => {
     }
 
     if (req) {
+      if (req.headers['host']?.endsWith('.onion')) {
+        data.recaptcha_enabled = false;
+      }
       if (req.mode !== undefined) data.mode = req.mode;
       data.theme = req.theme || req.cookies?.theme || cfg.websrv.theme || 'f0ck';
       if (!data.url) data.url = req.url;