SMF Mod Site

Mod Name:
Created By:
青山 素子
Spam Prevention
First Created:
December 27, 2007, 10:43:17 PM
Last Modified:
August 04, 2018, 12:46:17 AM
Latest Version:
Compatible With:
2.0, 2.0.7, 2.0.10, 2.0.15
Total Downloads:

Download this mod

reCAPTCHAforSMF_0-9-7.tar.gz (8kB) [6454]
reCAPTCHAforSMF_0-9-8.tar.gz (8kB) [12242]
reCAPTCHAforSMF_0-9-8a.tar.gz (8kB) [10956]
reCAPTCHAforSMF_0-9-9.tar.gz (10kB) [2781]
reCAPTCHAforSMF_1.0.0.tar.gz (7kB) [364]
reCAPTCHAforSMF_1.0.1.tar.gz (7kB) [5400]
reCAPTCHAforSMF_2.0.0.tar.gz (9kB) [2774]
Manual Install Instructions for SMF


This modification allows you to use reCAPTCHA instead of the built-in Visual Verification system. It supports the SMF 2.0 series.

Portions of the code use the PHP reCAPTCHA API.

This mod and other information can be found at:


  • Use reCAPTCHA on your forum in place of or in combination with the built-in verification options.
  • Support for built-in reCAPTCHA themes

How to Use
You can enable reCAPTCHA by going to:

Admin -> Configuration -> Security and Moderation -> Anti-Spam

A set of keys are required for operation of reCAPTCHA. A link is provided in the settings to register for a key pair.

2.0 Upgrade Note
If you are upgrading from a version older than 2.0, there is one major change to be aware of.

Starting with version 2.0, this modification no longer replaces the built-in image verification. It now operates independently of those settings. If you don't want the built-in image verification, make sure to set it to "None".

Known Issues
  • The error messages are the built-in ones, so they will talk about letters not being filled in or matching.

This code is licensed under the terms of the BSD 3-Clause License. SMF code used in this mod is copyright Simple Machines. All original code is copyright Michael Johnson.

The reCAPTCHA PHP library is licensed under the BSD 3-Clause License.

"SMF" and "Simple Machines" are trademarks of Simple Machines.