Say goodbye to annoying spam - with Maspik you'll make unwanted messages a rarity and spam a thing of the past!

Contact Form 7 Email Validation plugin adds an extended validation to verify domain in email address for email fields of Contact Form 7 plugin.

Adds a 'confirm email address' field to the WooCommerce checkout page.

Prevent URLS & Emails in gravity forms textarea fields.

This plugin adds native HTML5 validation support to Gravity Forms' fields.

This plugin will allow you to check your pages/posts HTML against the W3C Validator.

This plugin adds client-side validation to the Wordpress comment form, using the jQuery validation plugin.

Ideal Postcodes UK address search and validation extension for WooCommerce

The Validated Field add-on for Advanced Custom Fields provides input masking and server-side validation of other field types.

Added mail validation function to Contact Form 7. Protected by rejection filter, RFC filter, and DNS filter.

This plugin adds an awesome feature that provides instant feedback and guidance in each field, helps prevent errors, reduces form submission time, and …

Track failed form submissions and get notified when they reach a customisable threshold. Requires Gravity Forms.

The WooCommerce Address Validator plugin automatically validates and corrects billing and shipping addresses for 240+ countries world-wide (https://ww …

With the Byteplant Phone Validator plugin you can easily verify if a phone number is really valid and callable (https://www.byteplant.

Validation Plugin comments. The plugin is based on js-script jquery.validate.

With the Byteplant Email Validator plugin you can easily verify with a real-time live check if an email address really exists and is valid (https://ww …

Kick spam with a highly advanced email validation in comment forms, user registration and contact forms using Mailgun's Email validation service.

WordPress Fix HTML5 Validation

This widget will submit your wordpress RSS feed to feedvalidator.org, and check the results to verify your feed is valid.

Automatically checks the validity of the page with the service provided by the site http://validator.w3.org/