diff --git a/doc/sources/admin/captcha.rst b/doc/sources/admin/captcha.rst
index 22aa87c948affa069df33f45cfbf2a1f639f02ad..4b0e3aceb0068cabd9d8251c1fe23dc3377d50f2 100644
--- a/doc/sources/admin/captcha.rst
+++ b/doc/sources/admin/captcha.rst
@@ -38,6 +38,11 @@ Go in ``General parameters`` > ``Portal`` > ``Captcha``:
 
 .. _customcaptcha:
 
+Alternatives
+------------
+
+- :doc:`Google reCaptcha<recaptcha>`
+
 Custom Captcha modules
 ----------------------
 
diff --git a/doc/sources/admin/index_portal.rst b/doc/sources/admin/index_portal.rst
index 85aa431514d762768004ed17be3dafc4cfcf7efc..648fde0e86e1adde64a0f0d8ebd1dca31c355bda 100644
--- a/doc/sources/admin/index_portal.rst
+++ b/doc/sources/admin/index_portal.rst
@@ -11,6 +11,7 @@ Portal configuration
    portalservers
    captcha
    public_pages
+   recaptcha
    secondfactor
    index_protocols
    index_authdb
diff --git a/doc/sources/admin/recaptcha.rst b/doc/sources/admin/recaptcha.rst
new file mode 100644
index 0000000000000000000000000000000000000000..dadc4f3040003e5cf8954250fefaced57f77b3a3
--- /dev/null
+++ b/doc/sources/admin/recaptcha.rst
@@ -0,0 +1,29 @@
+reCaptcha
+=========
+
+Presentation
+------------
+
+Captcha system provided by `Google <https://about.google>`__.
+
+See `Google reCAPTCHA <https://www.google.com/recaptcha/about/>`__
+for more.
+
+Configuration
+-------------
+
+Configure captcha like :doc:`LLNG internal captcha<captcha>` but use a
+"custom captcha module", set:
+
+- **Captcha module** to "``::Captcha::ReCaptcha``"
+- in **Captcha module options**, add the following keys
+
+   - ``dataSiteKey``: the key ID given in Google console
+   - ``secretKey``: the secret key
+
+Then adapt the "Content-Security-Policy" headers, cspDefault and cspScript
+should be set to :
+
+::
+
+  https://www.google.com https://www.gstatic.com 'self'
diff --git a/doc/sources/admin/start.rst b/doc/sources/admin/start.rst
index f914abbe584662e9bb3802d9a55200e81215542f..d731f8126f6d6fb2661daed5a87dd47e21dcaf9a 100644
--- a/doc/sources/admin/start.rst
+++ b/doc/sources/admin/start.rst
@@ -108,6 +108,7 @@ Portal
 -  :doc:`Portal menu<portalmenu>`
 -  :doc:`REST/SOAP servers<portalservers>`
 -  :doc:`Captcha<captcha>`
+-  :doc:`reCaptcha<recaptcha>`
 -  :doc:`Public pages<public_pages>`
 
 
diff --git a/lemonldap-ng-portal/MANIFEST b/lemonldap-ng-portal/MANIFEST
index c7a269af0cc293d40ea6106796d54cc05535683c..8d42669fd7249436f70c4e9820e9497278f6ceb7 100644
--- a/lemonldap-ng-portal/MANIFEST
+++ b/lemonldap-ng-portal/MANIFEST
@@ -51,6 +51,7 @@ lib/Lemonldap/NG/Portal/Auth/SSL.pm
 lib/Lemonldap/NG/Portal/Auth/Twitter.pm
 lib/Lemonldap/NG/Portal/Auth/WebID.pm
 lib/Lemonldap/NG/Portal/Captcha.pod
+lib/Lemonldap/NG/Portal/Captcha/ReCaptcha.pm
 lib/Lemonldap/NG/Portal/Captcha/SecurityImage.pm
 lib/Lemonldap/NG/Portal/CDC.pm
 lib/Lemonldap/NG/Portal/CertificateResetByMail/Custom.pm
diff --git a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Captcha/ReCaptcha.pm b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Captcha/ReCaptcha.pm
new file mode 100644
index 0000000000000000000000000000000000000000..a4a1a6d41884faefef2e16c1e6d1d15cd3f881f3
--- /dev/null
+++ b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Captcha/ReCaptcha.pm
@@ -0,0 +1,79 @@
+package Lemonldap::NG::Portal::Captcha::ReCaptcha;
+
+use strict;
+use Mouse;
+use Lemonldap::NG::Common::UserAgent;
+
+# Add constants used by this module
+
+our $VERSION = '2.20.0';
+
+extends 'Lemonldap::NG::Portal::Main::Plugin';
+
+has ua => (
+    is      => 'rw',
+    lazy    => 1,
+    builder => sub {
+        my $ua = Lemonldap::NG::Common::UserAgent->new( $_[0]->{conf} );
+        $ua->env_proxy();
+        return $ua;
+    }
+);
+
+sub init {
+    my ($self) = @_;
+    unless ($self->conf->{captchaOptions}->{dataSiteKey}
+        and $self->conf->{captchaOptions}->{secretKey} )
+    {
+        $self->logger->error('Missing required options for reCaptcha');
+        return 0;
+    }
+    return 1;
+}
+
+sub init_captcha {
+    my ( $self, $req ) = @_;
+
+    $req->data->{customScript} .=
+      '<script src="https://www.google.com/recaptcha/enterprise.js"></script>';
+
+    # Read option from the manager configuration
+    my $dataSiteKey = $self->conf->{captchaOptions}->{dataSiteKey};
+    my $html =
+qq'<div class="g-recaptcha" data-sitekey="$dataSiteKey" data-action="LOGIN"></div>';
+    $req->captchaHtml($html);
+}
+
+sub check_captcha {
+    my ( $self, $req ) = @_;
+
+    my $captcha_input = $req->param('g-recaptcha-response');
+    unless ($captcha_input) {
+        $self->logger->info('No captcha value submitted');
+        return 0;
+    }
+    my $response = $self->ua->post(
+        'https://www.google.com/recaptcha/api/siteverify',
+        {
+            secret   => $self->conf->{captchaOptions}->{secretKey},
+            response => $captcha_input,
+        }
+    );
+    if ( $response->is_success ) {
+        my $res = eval { JSON::from_json( $response->decoded_content ) };
+        if ($@) {
+            $self->logger->error("reCaptcha: $@");
+            return 0;
+        }
+        unless ( $res->{success} ) {
+            $self->logger->info(
+                'reCaptcha errors:' . $response->decoded_content );
+        }
+        return $res->{success};
+    }
+    $self->logger->error( 'reCaptcha error: ' . $response->status_line );
+    return 0;
+}
+
+1;
+