Ivan

The Google Authenticator plugin for WordPress gives you two-factor authentication using the Google Authenticator app for Android/iPhone/Blackberry.
If you are security aware, you may already have the Google Authenticator app installed on your smartphone, using it for two-factor authentication on Gmail/Dropbox/Lastpass/Amazon etc.
The two-factor authentication requirement can be enabled on a per-user basis. You could enable it for your administrator account, but log in as usual with less privileged accounts.
If You need to maintain your blog using an Android/iPhone app, or any other software using the XMLRPC interface, you can enable the App password feature in this plugin, 
but please note that enabling the App password feature will make your blog less secure.
<h3>Credits</h3>
Thanks to:
<a href="https://profiles.wordpress.org/evinak/" rel="nofollow ugc">Oleksiy</a> for a bugfix in multisite.
<a href="https://github.com/pancek" rel="nofollow ugc">Paweł Nowacki</a> for the Polish translation
<a href="https://github.com/FabioZumbi12" rel="nofollow ugc">Fabio Zumbi</a> for the Portuguese translation
<a href="https://www.guidoschalkx.com/" rel="nofollow ugc">Guido Schalkx</a> for the Dutch translation.
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=henrik%40schack%2edk&lc=US&item_name=Google%20Authenticator&item_number=Google%20Authenticator&no_shipping=0&no_note=1&tax=0&bn=PP%2dDonationsBF&charset=UTF%2d8" rel="nofollow ugc">Henrik.Schack</a> for writing/maintaining versions 0.20 through 0.48
<a href="http://tobias.baethge.com/" rel="nofollow ugc">Tobias Bäthge</a> for his code rewrite and German translation.
<a href="http://blog.pcode.nl/" rel="nofollow ugc">Pascal de Bruijn</a> for his “relaxed mode” idea.
<a href="http://technobabbl.es/" rel="nofollow ugc">Daniel Werl</a> for his usability tips.
<a href="http://dd32.id.au/" rel="nofollow ugc">Dion Hulse</a> for his bugfixes.
<a href="https://profiles.wordpress.org/users/aldolat/" rel="nofollow ugc">Aldo Latino</a> for his Italian translation.
<a href="http://www.kaijia.me/" rel="nofollow ugc">Kaijia Feng</a> for his Simplified Chinese translation.
<a href="http://www.buayacorp.com/" rel="nofollow ugc">Alex Concha</a> for his security tips.
<a href="http://jetienne.com/" rel="nofollow ugc">Jerome Etienne</a> for his jquery-qrcode plugin.
<a href="http://orizhial.com/" rel="nofollow ugc">Sébastien Prunier</a> for his Spanish and French translation.

Google Authenticator

Personally I feel 2FA should be a part of WordPress core. But since it isn't, plugins like this one are a must-have to secure your sites.

The configuration interface is clearly layed out and the login page fits in perfectly with the default WP login page styling.

This plugin is light-weight, unobtrusive, free and adds that extra layer of security. Should your admin credentials ever be compromised, 2FA will keep your site secure.

Must-have security plugin

Awesome plugin, which is almost always in first group of plugin I've install on new website. Thank you for create and maintain it.

One on few my first-to-install plugin

Google Authenticator for your WordPress blog.

mohsin.id

spartac

NotifSMS enables you to send text messages, OTP codes, and 2FA notifications directly from your WordPress site. 
You can send SMS alerts via Twilio, custom SMS gateways, or other supported providers.
Whether you want to notify WooCommerce customers, send OTP for login, or broadcast SMS to users, this plugin provides a straightforward solution.
<h3>🔹 Features</h3>
<ul>
<li>Send SMS from WordPress – Quickly send single or bulk SMS from your WordPress dashboard. </li>
<li>WooCommerce SMS Alerts – Notify customers about order status updates (completed, shipped, cancelled, etc.). </li>
<li>Contact Form 7 & Gravity Forms Integration – Send SMS when a form is submitted. </li>
<li>OTP & 2FA (Two Factor Authentication) – Add secure SMS-based login or verification. </li>
<li>Custom SMS Gateways – Use Twilio or integrate your preferred provider. </li>
<li>Bulk & Newsletter SMS – Send bulk SMS to all users or by user role. </li>
<li>Admin SMS Notifications – Get notified instantly of site activities (new user, post, comment, etc.). </li>
<li>URL Shortening Support – Integrates Bit.ly or Google URL Shortener API. </li>
<li>Developer Friendly – Hooks and filters for custom integrations. </li>
<li>Easy setup – Activate, configure your API key, and start sending SMS in minutes!</li>
</ul>
<h3>🔹 Use Cases</h3>
This plugin is optimized for speed, flexibility, and reliability. It integrates seamlessly with popular plugins and is ideal for: 
– WooCommerce stores that want to send SMS order notifications 
– WordPress membership or e-learning sites that need 2FA/OTP SMS 
– Businesses wanting SMS marketing or user alerts
You can even extend it with premium addons for deeper integrations.
<h3>🔸 Premium Addons</h3>
Upgrade with Pro Addons to unlock more SMS automation and integrations:
<ul>
<li>WooCommerce SMS Addon – Automatic order SMS notifications. </li>
<li>Event Espresso SMS Reminder – Send reminders to event attendees. </li>
<li>Bulk SMS Addon – Send SMS to all users, by role, or to custom lists. </li>
<li>Contact Form 7 SMS Addon – Admin SMS notifications for new form submissions. </li>
<li>Easy Digital Downloads Addon – Customer SMS notifications on order updates. </li>
<li>ClassiPress / Vantage / AdForest Addons – Send SMS to ad owners and business listers. </li>
</ul>
<a href="https://wpsms.io/sms-plugins/" rel="nofollow ugc">View all addons →</a>
Need a custom integration? <a href="https://wpsms.io/" rel="nofollow ugc">Contact us</a> — we’ll help you build one.
Visit the <a href="https://www.wpsms.io/" rel="nofollow ugc">official website</a> for documentation, guides, and API details. 
Contributors are welcome via <a href="https://github.com/mohsinoffline/wp-twilio-core" rel="nofollow ugc">GitHub</a>.
<blockquote>
Disclaimer: This plugin is not affiliated with or endorsed by Twilio, Inc., WordPress, WooCommerce, or any other third-party service mentioned. All trademarks belong to their respective owners.
</blockquote>
<h3>Third-Party Services</h3>
This plugin may send data to the following third-party services when certain features are enabled:
<h3>Bitly URL Shortener</h3>
When used: When the “Shorten URLs using Bit.ly” option is enabled in plugin settings, URLs in SMS messages are automatically shortened using the Bitly API.
Service Information: 
* Service Website: https://bitly.com/ 
* API Documentation: https://dev.bitly.com/v4_documentation.html 
* Terms of Service: https://bitly.com/pages/tos 
* Privacy Policy: https://bitly.com/pages/privacy
Data Sent: Long URLs from SMS messages are sent to Bitly’s API to generate shortened URLs. No personal user data is sent beyond the URLs themselves.
<h3>Google URL Shortener (Deprecated)</h3>
When used: When the “Shorten URLs using Google (Deprecated)” option is enabled in plugin settings, URLs in SMS messages are automatically shortened using the Google URL Shortener API.
Note: Google has deprecated this service. We recommend using Bitly instead.
Service Information: 
* Service Website: https://developers.google.com/url-shortener 
* Terms of Service: https://developers.google.com/terms 
* Privacy Policy: https://policies.google.com/privacy
Data Sent: Long URLs from SMS messages are sent to Google’s API to generate shortened URLs. No personal user data is sent beyond the URLs themselves.
Important: These third-party services are only used when you explicitly enable URL shortening in the plugin settings. If URL shortening is disabled, no data is sent to these services.

NotifSMS – Notifications, OTP & 2FA

This plugin works like a charm. Thanks to the author!



Excellent Work

Send SMS, OTP & 2FA notifications from WordPress via Twilio. Includes automated alerts, bulk messaging, and integrations with popular plugins.

Google Authenticator vs NotifSMS – Notifications, OTP & 2FA