reCAPTCHA for WooCommerce allows you to add google reCAPTCHA on Login, Register, Lost password form. Also you can set reCAPTCHA on Checkout page.
Plugin support mutliple reCAPTCHA on same page.
[h=3]Features:[/h]

• Easy to customize, setup and use.
• Add reCAPTCHA on Login form.
• Add reCAPTCHA on Register form.
• Add reCAPTCHA on Lost password form.
• Add reCAPTCHA on Checkout page with different position.
• Support multiple reCAPTCHA on same page.
  i.e. if you have login and register form on same page then it will work in both form.
• Customizable error message.
• Different theme and size for reCAPTCHA.
• Render reCAPTCHA on your desired language.

[h=3]Settings[/h] [h=3]reCAPTCHA on Login & Register Form[/h] [h=3]reCAPTCHA on Lost Password Form[/h] [h=3]reCAPTCHA on Checkout page with diffrent position[/h] After checkout form
Before checkout form
Checkout order review form
After checkout order review form
Before place order button

Get Google reCAPTCHA key from here
[h=3]Demo:[/h]

• Demo

[h=3]Change Log:[/h] = Version 1.1.0 (2021-07-01) = * [+] Enhancement - Added support for WPML. Load captcha language based on current WPML language * [*] Enhancement - Added Features to display captcha after few failed attempts on checkout * [*] Fix - Resolved checkout validation issue * [*] Dev - Tested with WordPress 5.7.2 * [*] Dev - Tested with WooCommerce 5.4.1 = Version 1.0.9 (2020-05-09) = * [+] Enhancement - Updater Code Optimization. * [*] Dev - Tested with WordPress 5.4.1. * [*] Dev - Tested with WooCommerce 4.1.0. = Version 1.0.8 (2018-06-25) = * [*] Resolved plugin version number issue. = Version 1.0.7 (2018-06-24) = * [*] Resolved js error in console on checkout page when recaptcha not enabled. = Version 1.0.6 (2018-03-05) = * [*] Updated download link of Auto Update plugin. See full change log here