How can I add captcha to Salesforce Web-to-Lead form to prevent spam?

Question- Hi, I have a WordPress CRM website and we use salesforce web to lead form on our website for to collect leads but we are fed up with thousand of spams daily via that contact form. Is there any way to solve this issue? We don’t want to remove the web to lead salesforce form – M.Richardson

Answer –

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As per our research, the possible solutions are –

1.http://sfdc.arrowpointe.com/2007/05/24/fight-web-to-lead-spam-w-akismet/ (Free but not 100% sure unless experiment)

2.http://www.arrowpointe.com/products/spamcheck/ (40$ per month)

3. http://wordpress.org/plugins/salesforce-wordpress-to-lead/ (Captcha option is there but not sure with latest WP version)

4. http://sparkorange.net/blog/8-creating-a-better-web-to-lead-form (Custom coding & experiment is required. They have just put a concept/hint/sample code on site)

5. FormVester – https://appexchange.salesforce.com/listingDetail?listingId=a0330000002YXhxAAG (Got few positive reviews about this application)

There are 2 more solutions – (Not recommended though)

via hidden css fields in web to lead form that robots would fill up but humans would not and by that differentiation to protect spam
Another one is to use conditional fields in the salesforce form for not to use keywords such as drugs/viagra/cialis etc

As per our finding, this is a big problem faced by thousand of users and there is no ready-made /easy solution. Even salesforce has no specific solution for this. Also any captcha plugin can’t be integrated directly this way to salesforce form. In extreme case, you have to use other contact form alternatives.