ReCaptcha API v2 Styling

Question

I have not had much success finding how to style Google's new recaptcha (v2). The eventual goal is to make it responsive, but I am having difficulty applying styling for even simple things like width.

Their API documentation does not appear to give any specifics on how to control styling at all other than the theme parameter, and simple CSS & JavaScript solutions haven't worked for me.

Basically, I need to be able to apply CSS to Google's new version of reCaptcha. Using JavaScript with it is acceptable.

Answer 1

Overview:

Sorry to be the answerer of bad news, but after research and debugging, it's pretty clear that there is no way to customize the styling of the new reCAPTCHA controls. The controls are wrapped in an iframe, which prevents the use of CSS to style them, and Same-Origin Policy prevents JavaScript from accessing the contents, ruling out even a hacky solution.

Why No Customize API?:

Unlike reCAPTCHA API Version 1.0, there are no customize options in API Version 2.0. If we consider how this new API works, it's no surprise why.

Excerpt from Are you a robot? Introducing “No CAPTCHA reCAPTCHA”:

While the new reCAPTCHA API may sound simple, there is a high degree of sophistication behind that modest checkbox. CAPTCHAs have long relied on the inability of robots to solve distorted text. However, our research recently showed that today’s Artificial Intelligence technology can solve even the most difficult variant of distorted text at 99.8% accuracy. Thus distorted text, on its own, is no longer a dependable test.

To counter this, last year we developed an Advanced Risk Analysis backend for reCAPTCHA that actively considers a user’s entire engagement with the CAPTCHA—before, during, and after—to determine whether that user is a human. This enables us to rely less on typing distorted text and, in turn, offer a better experience for users. We talked about this in our Valentine’s Day post earlier this year.

If you were able to directly manipulate the styling of the control elements, you could easily interfere with the user-profiling logic that makes the new reCAPTCHA possible.

What About a Custom Theme?:

Now the new API does offer a theme option, by which you can choose a preset theme such as light and dark. However there is not presently a way to create a custom theme. If we inspect the iframe, we will find the theme name is passed in the query string of the src attribute. This URL looks something like the following.

https://www.google.com/recaptcha/api2/anchor?...&theme=dark&...

This parameter determines what CSS class name is used on the wrapper element in the iframe and determines the preset theme to use.

Digging through the minified source, I found that there are actually 4 valid theme values, which is more than the 2 listed in the documentation, but default and standard are the same as light.

We can see the code that selects the class name from this object here.

There is no code for a custom theme, and if any other theme value is specified, it will use the standard theme.

In Conclusion:

At present, there is no way to fully style the new reCAPTCHA elements, only the wrapper elements around the iframe can be stylized. This was almost-certainly done intentionally, to prevent users from breaking the user profiling logic that makes the new captcha-free checkbox possible. It is possible that Google could implement a limited custom theme API, perhaps allowing you to choose custom colors for existing elements, but I would not expect Google to implement full CSS styling.

Answer 2

As guys mentioned above, there is no way ATM. but still if anyone interested, then by adding in just two lines you can at least make it look reasonable, if it break on any screen. you can assign different value in @media query.

<div id="recaptchaContainer" style="transform:scale(0.8);transform-origin:0 0"></div>

Hope this helps anyone :-).

Answer 3

I use below trick to make it responsive and remove borders. this tricks maybe hide recaptcha message/error.

This style is for rtl lang but you can change it easy.

.g-recaptcha {
    position: relative;
    width: 100%;
    background: #f9f9f9;
    overflow: hidden;
}

.g-recaptcha > * {
    float: right;
    right: 0;
    margin: -2px -2px -10px;/*remove borders*/ 
}

.g-recaptcha::after{
    display: block;
    content: "";
    position: absolute;
    left:0;
    right:150px;
    top: 0;
    bottom:0;
    background-color: #f9f9f9;
    clear: both;
}

<div class="g-recaptcha" data-sitekey="Your Api Key"></div>
<script src='https://www.google.com/recaptcha/api.js?hl=fa'></script>

Answer 4

Unfortunately we cant style reCaptcha v2, but it is possible to make it look better, here is the code:

Click here to preview

.g-recaptcha-outer{
    text-align: center;
    border-radius: 2px;
    background: #f9f9f9;
    border-style: solid;
    border-color: #37474f;
    border-width: 1px;
    border-bottom-width: 2px;
}
.g-recaptcha-inner{
    width: 154px;
    height: 82px;
    overflow: hidden;
    margin: 0 auto;
}
.g-recaptcha{
    position:relative;
    left: -2px;
    top: -1px;
}

<div class="g-recaptcha-outer">
    <div class="g-recaptcha-inner">
        <div class="g-recaptcha" data-size="compact" data-sitekey="YOUR KEY"></div>
    </div>
</div>

Answer 5

Add a data-size property to the google recaptcha element and make it equal to "compact" in case of mobile.

Refer: google recaptcha docs

Answer 6

What you can do is to hide the ReCaptcha Control behind a div. Then make your styling on this div. And set the css "pointer-events: none" on it, so you can click through the div (Click through a DIV to underlying elements).

The checkbox should be in a place where the user is clicking.

Answer 7

I came across this answer trying to style the ReCaptcha v2 for a site that has a light and a dark mode. Played around some more and discovered that besides transform, filter is also applied to iframe elements so ended up using the default/light ReCaptcha and doing this when the user is in dark mode:

.g-recaptcha {
    filter: invert(1) hue-rotate(180deg);
}

The hue-rotate(180deg) makes it so that the logo is still blue and the check-mark is still green when the user clicks it, while keeping white invert()'ed to black and vice versa.

Didn't see this in any answer or comment so decided to share even if this is an old thread.

Answer 8

You can recreate recaptcha , wrap it in a container and only let the checkbox visible. My main problem was that I couldn't take the full width so now it expands to the container width. The only problem is the expiration you can see a flick but as soon it happens I reset it.

See this demo http://codepen.io/alejandrolechuga/pen/YpmOJX

function recaptchaReady () {
  grecaptcha.render('myrecaptcha', {
  'sitekey': '6Lc7JBAUAAAAANrF3CJaIjt7T9IEFSmd85Qpc4gj',
  'expired-callback': function () {
    grecaptcha.reset();
    console.log('recatpcha');
  }
});
}

.recaptcha-wrapper {
    height: 70px;
  overflow: hidden;
  background-color: #F9F9F9;
  border-radius: 3px;
  box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);
  -webkit-box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);
  -moz-box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);
  height: 70px;
  position: relative;
  margin-top: 17px;
  border: 1px solid #d3d3d3;
  color: #000;
}

.recaptcha-info {
  background-size: 32px;
  height: 32px;
  margin: 0 13px 0 13px;
  position: absolute;
  right: 8px;
  top: 9px;
  width: 32px;
  background-image: url(https://www.gstatic.com/recaptcha/api2/logo_48.png);
  background-repeat: no-repeat;
}
.rc-anchor-logo-text {
  color: #9b9b9b;
  cursor: default;
  font-family: Roboto,helvetica,arial,sans-serif;
  font-size: 10px;
  font-weight: 400;
  line-height: 10px;
  margin-top: 5px;
  text-align: center;
  position: absolute;
  right: 10px;
  top: 37px;
}
.rc-anchor-checkbox-label {
  font-family: Roboto,helvetica,arial,sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: 17px;
  left: 50px;
  top: 26px;
  position: absolute;
  color: black;
}
.rc-anchor .rc-anchor-normal .rc-anchor-light {
  border: none;
}
.rc-anchor-pt {
  color: #9b9b9b;
  font-family: Roboto,helvetica,arial,sans-serif;
  font-size: 8px;
  font-weight: 400;
  right: 10px;
  top: 53px;
  position: absolute;
  a:link {
    color: #9b9b9b;
    text-decoration: none;
  }
}

g-recaptcha {
  // transform:scale(0.95);
  // -webkit-transform:scale(0.95);
  // transform-origin:0 0;
  // -webkit-transform-origin:0 0;

}

.g-recaptcha {
  width: 41px;

  /* border: 1px solid red; */
  height: 38px;
  overflow: hidden;
  float: left;
  margin-top: 16px;
  margin-left: 6px;
  
    > div {
    width: 46px;
    height: 30px;
    background-color:  #F9F9F9;
    overflow: hidden;
    border: 1px solid red;
    transform: translate3d(-8px, -19px, 0px);
  }
  div {
    border: 0;
  }
}

<script src='https://www.google.com/recaptcha/api.js?onload=recaptchaReady&&render=explicit'></script>

<div class="recaptcha-wrapper">
  <div id="myrecaptcha" class="g-recaptcha"></div>
          <div class="rc-anchor-checkbox-label">I'm not a Robot.</div>
        <div class="recaptcha-info"></div>
        <div class="rc-anchor-logo-text">reCAPTCHA</div>
        <div class="rc-anchor-pt">
          <a href="https://www.google.com/intl/en/policies/privacy/" target="_blank">Privacy</a>
          <span aria-hidden="true" role="presentation"> - </span>
          <a href="https://www.google.com/intl/en/policies/terms/" target="_blank">Terms</a>
        </div>
</div>

Answer 9

Great! Now here is styling available for reCaptcha.. I just use inline styling like:

<div class="g-recaptcha" data-sitekey="XXXXXXXXXXXXXXX" style="transform: scale(1.08); margin-left: 14px;"></div> 

whatever you wanna to do small customize in inline styling...

Hope it will help you!!

Answer 10

Just adding a hack-ish solution to make it responsive.

Wrap the recaptcha in an extra div:

<div class="recaptcha-wrap">                   
    <div id="g-recaptcha"></div>
</div>

Add styles. This assumes the dark theme.

// Recaptcha
.recaptcha-wrap {
    position: relative;
    height: 76px;
    padding:1px 0 0 1px;
    background:#222;
    > div {
        position: absolute;
        bottom: 2px;
        right:2px;
        font-size:10px;
        color:#ccc;
    }
}

// Hides top border
.recaptcha-wrap:after {
    content:'';
    display: block;
    background-color: #222;
    height: 2px;
    width: 100%;
    top: -1px;
    left: 0px;
    position: absolute;
}

// Hides left border
.recaptcha-wrap:before {
    content:'';
    display: block;
    background-color: #222;
    height: 100%;
    width: 2px;
    top: 0;
    left: -1px;
    position: absolute;
    z-index: 1;
}

// Makes it responsive & hides cut-off elements
#g-recaptcha {
    overflow: hidden;
    height: 76px;
    border-right: 60px solid #222222;
    border-top: 1px solid #222222;
    border-bottom: 1px solid #222;
    position: relative;
    box-sizing: border-box;
    max-width: 294px;
}

This yields the following:

It will now resize horizontally, and doesn't have a border. The recaptcha logo would get cut off on the right, so I am hiding it with a border-right. It's also hiding the privacy and terms links, so you may want to add those back in.

I attempted to set a height on the wrapper element, and then vertically center the recaptcha to reduce the height. Unfortunately, any combo of overflow:hidden and a smaller height seems to kill the iframe.

Answer 11

in the V2.0 it's not possible. The iframe blocks all styling out of this. It's difficult to add a custom theme instead of the dark or light one.

Answer 12

Late to the party, but maybe my solution will help somebody.

I haven't found any solution that works on a responsive website when the viewport changes or the layout is fluid.

So I've created a jQuery script for django-cms that is dynamically adapting to a changing viewport. I'm going to update this response as soon as I have the need for a modern variant of it that is more modular and has no jQuery dependency.

html

<div class="g-recaptcha" data-sitekey="{site_key}" data-size={size}> 
</div> 

css

.g-recaptcha { display: none; }

.g-recaptcha.g-recaptcha-initted { 
    display: block; 
    overflow: hidden; 
}

.g-recaptcha.g-recaptcha-initted > * {
    transform-origin: top left;
}

js

window.djangoReCaptcha = {
    list: [],
    setup: function() {
        $('.g-recaptcha').each(function() {
            var $container = $(this);
            var config = $container.data();

            djangoReCaptcha.init($container, config);
        });

        $(window).on('resize orientationchange', function() {
            $(djangoReCaptcha.list).each(function(idx, el) {
                djangoReCaptcha.resize.apply(null, el);
            });
        });
    },
    resize: function($container, captchaSize) {
        scaleFactor = ($container.width() / captchaSize.w);
        $container.find('> *').css({
            transform: 'scale(' + scaleFactor + ')',
            height: (captchaSize.h * scaleFactor) + 'px'
        });
    },
    init: function($container, config) {
        grecaptcha.render($container.get(0), config);

        var captchaSize, scaleFactor;
        var $iframe = $container.find('iframe').eq(0);

        $iframe.on('load', function() {
            $container.addClass('g-recaptcha-initted');
            captchaSize = captchaSize || { w: $iframe.width() - 2, h: $iframe.height() };
            djangoReCaptcha.resize($container, captchaSize);
            djangoReCaptcha.list.push([$container, captchaSize]);
        });
    },
    lateInit: function(config) {
        var $container = $('.g-recaptcha.g-recaptcha-late').eq(0).removeClass('.g-recaptcha-late');
        djangoReCaptcha.init($container, config);
    }
};

window.djangoReCaptchaSetup = window.djangoReCaptcha.setup;

Answer 13

With the integration of the invisible reCAPTCHA you can do the following:

To enable the Invisible reCAPTCHA, rather than put the parameters in a div, you can add them directly to an html button.

a. data-callback=””. This works just like the checkbox captcha, but is required for invisible.

b. data-badge: This allows you to reposition the reCAPTCHA badge (i.e. logo and ‘protected by reCAPTCHA’ text) . Valid options as ‘bottomright’ (the default), ‘bottomleft’ or ‘inline’ which will put the badge directly above the button. If you make the badge inline, you can control the CSS of the badge directly.

Answer 14

In case someone struggling with the recaptcha of contact form 7 (wordpress) here is a solution working for me

.wpcf7-recaptcha{
clear: both;
float: left;
}
.wpcf7-recaptcha{
margin-right: 6px;
width: 206px;
height: 65px;
overflow: hidden;
border-right: 1px solid #D3D3D3;
}
.wpcf7-recaptcha iframe{
padding-bottom: 15px;
border-bottom: 1px solid #D3D3D3;
background: #F9F9F9;
border-left: 1px solid #d3d3d3;
}

Answer 15

Lets play a little with JavaScript:

First at all, we know that recaptcha badget include all the shit from the most crazy people on Google, so you can only make changes with theme "dark" and "light" on your web. Take a look to my website

SantiagoSoñora.

let recaptcha = document.querySelector('.g-recaptcha');

With this, you only can touch simple settings of the badge, like z-index and size, but no much more...

So far, i made two functions that set data-theme to light or dark mode at innit. Note that its neccessary assign the "light" because Google not include that by default.

function reCaptchaDark() {
    document.addEventListener('DOMContentLoaded', (event) => {
        recaptcha.setAttribute("data-theme", "dark");
        })
    }

function reCaptchaLight() {
    document.addEventListener('DOMContentLoaded', (event) => {
        recaptcha.setAttribute("data-theme", "light");
        })
    }

Then, for example, my web looks if user prefers a dark or a light theme, and set that configurations to the recaptcha bag:

(theme.onLoad = function() {
    if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
        reCaptchaDark();
        toggleTheme();
        }
    else {
        reCaptchaLight();
        }
    })();

Note that my code for toggle from dark to light is on the toggleTheme() function. Keep doing magic: You should configure a class on the html tag or something else on your web for made the change between dark and light theme, and with that we now modify the src on the iframe so when we toggle dark/light mode ,with our button it changes:

theme.onclick = function() {
    toggleTheme();
    if (html.classList.contains('dark')) {
        recaptcha.setAttribute("data-theme", "dark");
        setTimeout(function() {
            let iframes = document.querySelectorAll('iframe');
            iframes[0].src = iframes[0].src.replace('&theme=light', '&theme=dark');
            }, 0);
        }
    else {
        recaptcha.setAttribute("data-theme", "light");
        setTimeout(function() {
            let iframes = document.querySelectorAll('iframe');
            iframes[0].src = iframes[0].src.replace('&theme=dark', '&theme=light');
            }, 0);
        }
    }

And here you go, the recaptcha badge change from dark to light "preassigned" themes by Google bad guys.

And last but not least, a function that updates the page to change if your theme is dark by default. This update the LocalStorage

(function() {
    if( window.localStorage ) {
        if( !localStorage.getItem('firstLoad') ) {
            localStorage['firstLoad'] = true;
            window.location.reload();
        }  
        else
            localStorage.removeItem('firstLoad');
        }
    })();

You can use the class .grecaptcha-badge for some css changes, like opacity and box-shadow, -> (use !important) Thats all, hope you can implement on your site

Answer 16

if you use scss, that worked for me:

   .recaptcha > div{
      transform: scale(0.84);
      transform-origin: 0;
   }

Answer 17

If someone is still interested, there is a simple javascript library (no jQuery dependency), named custom recaptcha. It lets you customize the button with css and implement some js events (ready/checked). The idea is to make the default recaptcha "invisible" and put a button over it. Just change the id of the recaptcha and that's it.

<head>
    <script src="https://azentreprise.org/download/custom-recaptcha.min.js"></script>
    <style type="text/css">
        #captcha {
            float: left;
            margin: 2%;

            background-color: rgba(72, 61, 139, 0.5); /* darkslateblue with 50% opacity */
            border-radius: 2px;

            font-size: 1em;
            color: #C0FFEE;
        }

        #captcha.success {
            background-color: rgba(50, 205, 50, 0.5); /* limegreen with 50% opacity */
            color: limegreen;
        }
    </style>
</head>
<body>
    <div id="captcha" data-sitekey="your_site_key" data-label="Click here" data-label-spacing="15"></div>
</body>

See https://azentreprise.org/read.php?id=1 for more information.

Answer 18

I am just adding this kind of solution / quick fix so it won't get lost in case of a broken link.

Link to this solution "Want to add link How to resize the Google noCAPTCHA reCAPTCHA | The Geek Goddess" was provided by Vikram Singh Saini and simply outlines that you could use inline CSS to enforce framing of the iframe.

// Scale the frame using inline CSS
 <div class="g-recaptcha" data-theme="light" 
 data-sitekey="XXXXXXXXXXXXX" 

 style="transform:scale(0.77);
 -webkit-transform:scale(0.77);
 transform-origin:0 0;
  -webkit-transform-origin:0 0;

 ">
</div> 

// Scale the images using a stylesheet
<style>
#rc-imageselect, .g-recaptcha {
  transform:scale(0.77);
  -webkit-transform:scale(0.77);
  transform-origin:0 0;
  -webkit-transform-origin:0 0;
}
</style>

Answer 19

You can use some CSS for Google reCAPTCHA v2 styling on your website:

– Change background, color of Google reCAPTCHA v2 widget:

.rc-anchor-light { 
background: #fff!important; 
color: #fff!important; }

or

.rc-anchor-normal{
background: #000 !important; 
color: #000 !important; }

– Resize the Google reCAPTCHA v2 widget by using this snippet:

.rc-anchor-light { 
transform:scale(0.9); 
-webkit-transform:scale(0.9); }

– Responsive your Google reCAPTCHA v2:

@media only screen and (min-width: 768px) {
.rc-anchor-light { 
transform:scale(0.85); 
-webkit-transform:scale(0.85); } 
}

All elements, property of CSS above that’s just for your reference. You can change them by yourself (only using CSS class selector).

Refer on OIW Blog - How To Edit CSS of Google reCAPTCHA (Re-style, Change Position, Resize reCAPTCHA Badge)

You can also find out Google reCAPTCHA v3's styling there.

Answer 20

A bit late but I tried this and it worked to make the Recaptcha responsive on screens smaller than 460px width. You can't use css selector to select elements inside the iframe. So, better use the outermost parent element which is the class g-recaptcha to basically zoom-out i.e transform the size of the entire container. Here's my code which worked:

@media(max-width:459.99px) {
    .modal .g-recaptcha {
        transform:scale(0.75);
        -webkit-transform:scale(0.75); }
    }
}

Answer 21

Incase someone wants to resize recaptcha for small devices.

I was using recaptcha V2 with primeng p-captcha (for angular). The issue was that for smaller screens it would go out of the screen.

Although you can't actually resize it (the external thing and all everyone has explained it above) but there is a way with transform property (scaling the the container)

this was my code below the way, I achieved it

p-captcha div div {
  transform:scale(0.9) !important;
  -webkit-transform:scale(0.9) !important;
  transform-origin:0 0 !important;
  -webkit-transform-origin:0 0 !important;
}

Other than p-captcha you can use this code snippet below

.g-recaptcha {
  transform:scale(0.9);
  transform-origin:0 0;
 }

Before

After

Answer 22

Topic is old, but I also wanted to scale the reCAPTCHA widget -- but to make it bigger for phone users, unlike many others who wanted it smaller. The only way that worked was transform: scale(x), but that seemed to make the widget too wide for my page, thus shrinking the rest of the form on the page. Using a container div as shown below fixed my problem, and hopefully it will help someone else who thinks a bigger version is better on a small screen.

<style>
    :root {
        /* factor to scale the Google widget in potrait mode (on a phone) */
        --recaptcha-scale: 2; 
    }
    @media screen and (orientation: portrait) {

        /* needed to rein in the width of inner div when it is scaled */
        #g_recaptcha_div_container { 
            width: calc(100vmin / var(--recaptcha-scale));
        }
        #g_recaptcha_div {
            transform: scale(var(--recaptcha-scale)); 
            transform-origin: 0 0;
        }
        #submit_button {
            width: 65vmin;
            height: 9vmin;
            font-size: 7vmin;

            /* needed to scoot the button out from under the scaled div */
            margin-top: 10vmin; 
        }
    }
</style>

<html>
<!-- top of form with a bunch of fields to create an acct -->

    <div id="g_recaptcha_div_container">
        <div id="g_recaptcha_div" class="g-recaptcha" data-sitekey="foo">
        </div>
    </div>

    <input id="submit_button" type="submit" value="Create Account">

<!-- bottom of form -->
</html>

Answer 23

You can try to color it with this css filter hack:

.colorize-pink {
  filter: brightness(0.5) sepia(1) hue-rotate(-70deg) saturate(5);
}

.colorize-navy {
  filter: brightness(0.2) sepia(1) hue-rotate(180deg) saturate(5);
}

and for the size, use transform css hack

 .captcha-size {
transform:scale(0.8);transform-origin:0 0
    }