What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.

At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.

We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.

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    Captcha doesn't seem to protect against bots

    Asked by Divation on May 14, 2011 at 02:06 AM

    I have a captcha on my form but bots have been submiting spam submissions like crazy.  How come the captcha isn't preventing this?

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    JotForm Support

    Answered by liyam on May 14, 2011 at 02:27 AM

    Hello Divation,

    I have tested your form and it seems to work alright. I also did not find spam submissions in your form.  Did you delete them already?

    We'll wait for your response.


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    Answered by Divation on May 14, 2011 at 04:46 AM

    The spam submissions are still there.  They are all the ones submitted with the state as California.  As you will noticed by the date stamp, they are submitted one right after another, only seconds apart.  The only way there could be so many submitted that fast, is if there was a bot spamming it.  Plus, my web analytics show a ton of bot hits. 

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    Answered by allanftd on May 14, 2011 at 05:12 AM

    Hi Divation,

    We're sorry for the trouble. You can use another safety feature of JotForm called Unique Submission. Your JotForm form will determine if a particular computer has already been used to submit a form submission using cookies or IP address checking. When used together with the Captcha feature, your form will be 100% bot-proof. 

    To use this feature, click Preferences button on your toolbar's Setup & Embed tab. Then go to Advanced Settings tab and select Strict Check for the Unique Submission settings.

    We hope you find this information useful. Please let us know how it goes so that we can further assist you. Thank you for trusting JotForm!



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    Answered by mtigue on September 02, 2011 at 10:01 AM

    For how long is the same IP prohibited from filling out the form. What if I have a user who needs to fill out the form again to register for a future event?

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    Answered by allanftd on September 02, 2011 at 10:30 AM

    Hi mtique,

    If you use the Strict Check option of Unique Submissions, the IP address of your user will be limited to a single entry until you delete the form. You may want to use the Loose Check option instead, which makes use of cookies instead of IP address. As such, deleting the cookie will allow your user to submit an entry again. 

    Please let us know if you have any other concerns. Thanks and enjoy using JotForm!