How to add CAPTCHA to Ninja Forms
Add a free, privacy-first CAPTCHA to Ninja Forms — Procaptcha blocks bot submissions on contact, signup and payment forms without breaking UX.
What is Ninja Forms?
Ninja Forms is a highly flexible and easy-to-use form builder plugin for WordPress that allows users to create a variety of forms, from simple contact forms to more complex surveys and registrations. It features a drag-and-drop builder, making it accessible to both beginners and experienced users without requiring any coding knowledge.
The plugin offers a wide range of customization options, allowing users to add and arrange fields, change the form layout, and design the form according to their needs. Ninja Forms supports conditional logic, enabling the display or hiding of fields based on user input.
Ninja Forms integrates with popular third-party services like email marketing platforms (e.g., Mailchimp, Constant Contact), payment gateways (e.g., PayPal, Stripe), and CRM systems, helping users manage form submissions and automate workflows.
The plugin provides detailed submission management and notifications, making it easy to track and respond to form entries. Ninja Forms is mobile-responsive, ensuring forms work smoothly on all devices. While the free version offers core form-building features, premium add-ons are available for more advanced functionality, such as multi-part forms, file uploads, and integration with other tools, making it scalable for various business needs.
Why Use Prosopo Procaptcha With Ninja Forms?
Prosopo is a specialist bot and agent trust platform. Every verdict traces to a rule the operator authored, on a proprietary detector with an open-source client stack. UK-incorporated, EU-processed, GDPR-native. It stops the abuse patterns WordPress form spam alone doesn't cover:
- Scraping
- Denial of inventory
- Credential stuffing
- Account takeover
- Click through rate/ad fraud
- Ticket scalping
- Black friday automation (and more general sale automation)
- Phishing attacks
- Loyalty programme automation
Prosopo also keeps visitor data out of Google's data controller chain for reCAPTCHA telemetry — the 2026 reCAPTCHA terms change reclassified Google as controller rather than processor.
How to integrate Prosopo Procaptcha with Ninja Forms
Install the Prosopo WordPress plugin
Register for a free account on Prosopo
Login to the Prosopo dashboard, and copy your site key and secret key
- Add your domain in the Prosopo dashboard, if it is not already present
- Add your site key and secret key to the Prosopo WordPress plugin settings. You can find them in Site Management in the Prosopo dashboard.
- From within any Form in Ninja Forms, select "Prosopo Procaptcha".
Once you save the form, CAPTCHA will automatically be included in it. Remember to repeat the process for every Ninja Form you want to add CAPTCHA to.
Related
- Spam bot protection — the broader use case: why your forms get spam and how to stop it across every platform.
- Free anti-spam for WordPress — all 16 WordPress plugin integrations on one page, plus Akismet positioning.
- Spam Filter — pair the CAPTCHA with email-pattern and traffic-source filtering (Gmail dot-trick, VPN/Tor, disposable domains).