5 effective ways to protect your Formidable Forms from spam

OOPSpam Anti-Spam WordPress Plugin supports Formidable Forms


Formidable Forms is one of the most popular contact form builder out there with over 13M downloads. It has everything you need to build a complex form from payment gateway integrating (Stripe etc.) to conditional logic and more. Formidable Forms Lite is available in the WordPress plugin directory and comes with basic fields and built-it spam filtering options. The Pro version adds advanced fields and many more features. Check out official comparison between Lite & Pro.

In this article, we are going to focus only on anti-spam capabilities of Formidable Forms. Both free Lite and paid Pro versions come with the same built-in spam protection choices. And then we look into third-party alternatives.


We wrote extensively about the honeypot technique and how it works. While it’s not as effective as it used to be, it still prevents some bots from spamming your contact forms. Here is a short description of what the honeypot method is:

A honeypot field is a hidden field that is meant to be filled only by bots. Bots scan a website and fill all the fields, including the hidden field in your form. Formidable Forms will automatically dismiss every submission with an entry in a honeypot field.

Formidable Forms comes with the honeypot feature and it’s enabled by default. If you getting spammed, first make sure this honeypot is still enabled.

Unlike other contact form solutions like Fluent Forms, Formidable Forms allows you to configure honeypot in three different modes: Off, Basic, and Strict. This is a great way to harden spam protection.

Always make sure the honeypot is enabled for all your forms. Switch from Basic to Strict mode, if you start getting spammed. This method is the less expensive and simplest way to stop spam. Once you start getting spam despite having a honeypot, look into other options.

Formidable Forms Honeypot

Token-based spam protection

Formidable Forms also provides Javascript-based (aka token-based) spam filtering. As this method relies on JavaScript, JavaScript needs to be enabled in the visitors’ browser for this to work. This technique prevents automated spam bots from submitting multiple entries.

This anti-spam measurement comes built-in and isn’t enabled by default. Here is how it works: Each time a form loads, a unique token is created and stored on the page and passed along with the form submission. On the backend, Formidable validates this token to make sure it is not being reused. If the token expired, is invalid, or doesn’t exist then the submission will be halted.

Token-based spam prevention is effective against basic bots. Unfortunately, they are ineffective against targeted spam, manual spam, and headless browser-based bots. Give a shot this option if you are getting spammed despite honeypot.

Formidable Forms Javascript-based spam filtering

It’s worth mentioning that in some cases caching (if you are using one) could be a problem with this technique as a token stored in the page’s DOM. Formidable Forms points out this issue in their official docs. You can avoid this by increasing token expiration time. Formidable Forms recommends using either frm_form_token_check_after_today or frm_form_token_check_before_today hooks to do so.

Using WordPress’s Comment Moderation

Formidable Forms did a great job by incorporating already available comment moderation into their forms. I’m talking about a feature that comes with every WordPress and accessible under WordPress Settings -> Discussion page -> Disallowed Comment Keys. This is a quick way to block surge of spam by adding URLs, IP or any spam words (per line) into this field. Formidable Forms then will check every submission against this list and block if matched.

Formidable Forms Comment Blacklist


Up to this point, we saw technics that don’t require third-party solutions. reCaptcha is a popular captcha solution that many websites use. Formidable Forms has built-in integration with reCaptcha. Unfortunately, unlike other similar contact form builders, Formidable Forms doesn’t have hCaptcha integration.

Formidable Forms supports both reCaptcha v2 and v3 (Invisible reCaptcha). reCaptcha is available both for free and paid versions. Enabling reCaptcha is pretty straightforward through the plugin’s settings. It involves creating Google Account then grabbing Site Key, and Secret Key and pasting them to appropriate fields under Global Settings -> reCaptcha in Formidable Forms. They provide a step-by-step tutorial on how to set up reCaptcha in Formidable Forms.

Should I use reCaptcha v2 or v3?

v3 came after many people complained about accessibility and usability issues with v2. v2 asks visitors to solve a challenge before submitting a form. To address this issue, Google removed the “challenge” part of reCaptcha. As a result, with v3, users don’t solve any challenges. Instead, it tracks the user’s behavior on your website and scores the user from 0 (bot) to 1 (human). It is up to the website owner to determine the threshold. In Formidable Forms, you don’t have control over this threshold.

Many people are happy with reCaptcha. It is effective against simple bots, however, advanced bots can bypass reCaptcha. There are also “captcha farms” where people get paid to solve reCaptcha. It will also slow down your website as it loads extra JS files into your website.

Formidable Forms reCaptcha

If you are looking for a free and quick workaround, reCaptcha is your solution.

OOPSpam WordPress plugin

Our WordPress plugin is another way to stop spam in Formidable Forms and WordPress comments. The plugin works with OOPSpam API that protects over 1.5M websites daily. While other spam filtering methods listed above are free, OOPSpam is a premium service and comes with 40 spam checks/month to test and see the difference.

It’s likely you have already tried the above options, and they didn’t work for you. For you, it could be a slow website from reCaptcha or overwhelming spam you are still getting despite implementing the above alternatives. What makes OOPSpam different from other solutions is that it doesn’t slow your website and is effective against human spammers and bots. There is no challenge to solve. No performance penalty as everything happens in your server instead of client-side. The OOPSpam API uses machine learning models, content analyses, IP reputation, and other rule-based checks to score every contact form submission. A combination of all these analyses returns a single spam score that is how it accurately stops both manual spam and bots.

On the plugin’s settings page, you could also adjust how sensitive you want your spam filter to be. Even keeping (recommend) default Sensitivity level setting will help you cut down spam to zero.

OOPSpam WordPress Plugin Sensitivity level

In addition, the plugin allows you to set up a filter to accept submissions only from certain countries and languages.

OOPSpam WordPress Plugin country & language restrictions

✨ Since then, we have also added the Block messages from these countries feature.

OOPSpam WordPress Plugin block countries

Here are a few steps to activate spam protection for Formidable Forms:

  1. Subscribe to get an API key then copy-paste the API key to the plugin’s appropriate field under Settings->OOPSpam Anti-Spam on your WordPress Admin Dashboard.

ℹ️ Make sure to select OOPSpam Dashboard on the setting page

  1. If you have Formidable Forms installed then a special section will appear on the OOPSpam Anti-Spam plugin’s settings page.

    OOPSpam Anti-Spam WordPress Plugin Settings

  2. On this page, you need to activate the spam filtering for Formidable Forms by checking the Activate Spam Protection checkbox. You don’t have to do anything on your form. Once you activate spam protection on the OOPSpam plugin settings, you are good to go.

  3. Don’t forget to enter a short message to display when a spam form entry is submitted. Your message will appear at the bottom of the message field.

OOPSpam detected spam on Formidable Forms

Final thoughts

All websites eventually get hit by spammers. As a website grows and gets more traffic it attracts more serious spammers with advanced bots. The captcha solutions will protect your website to a certain degree but they are not enough for targeted spam attacks, manual spam, and sophisticated bots. I hope this article helps you find a solution to your spam problem.

That is all! Go on and create your forms.

Happy spam-free day!

A cocktail of unique measurements means cutting edge spam protection.

Since our launch in 2017 we’ve been perfecting our API to be the trusted option for small businesses to enterprise— and continue to stick to our values of being the accessibility and privacy-friendly option. Give us a shot!

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