How to Set Unique Submissions on a Form

Last Update: June 6, 2017

Sometimes you may want to prevent form respondents from making multiple submissions in a form and this is when the Unique Submission is most useful, and it has three options: No CheckLoose Check, and Strict Check

No Check (default) - duplicate submissions will not be checked in this state.

Check cookies only - Checks whether the submission came from the same browser. It uses cookies stored in the browser's storage to verify duplicate submissions.

Check cookies and IP - Aside from cookies, it also checks if the submission came from the same IP address.

If you select Strict Check, people in the same network (in the same school, college, university, institution) will not be able to make submissions, as the IP address for the network would be the same. If you are considering the target audience as students in the same school, Loose Check should be chosen.

The instructions below shows how you can access Unique Submission through the form's builder page.


Step 2Look for Unique Submission and select an option from the drop-down.

Step 3After selecting an option, notice at the top of the builder page (below the Form Title) that all changes have been saved.

Questions? Please let us know below!


tinywebmaster (May 19, 2011 at 09:59 AM)

i have a client that needs to have a private login area for their website how do i use the username and password box to allow his clients to login to a separate part of his website and how do i set the page link to go to that part of the site

gkanellis (February 14, 2012 at 02:58 PM)

I am currently using your program for my reservation system and I keep having this one person sending "fake" emails. Is there a way to block out a specific IP address? please let me know.

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Almunawwara (March 12, 2012 at 10:49 AM)

It seems that if you choose a strict check, a form can only be submitted once from a particular IP address. With this decision, you are essentially blocking the IP address from submitting more than one form. So a person who wants to make fake submissions can only make 1 fake submission from a particular IP address. Then, they would have to use a proxy server or log in from another IP address.
So it's impossible to stop a particular person from making multiple submissions.
What would also be helpful would be 1. a way of identifying the MAC address and allowing only one submission per MAC, so that the user would have even more trouble making multiple submissions.
2. a way of preventing a person with a certain ID from submitting a particular form more than once.

geomat (June 07, 2012 at 05:21 AM)

Thanks. We permit different content from same person or email. But we like to prevent same title only. Does this cookie control or check the paper title only.

View Answer (March 17, 2013 at 11:57 PM)

What would be good is to have a unique submission method where a one time code is required for submission, and that code is barred from usage once used.


Form to be used by 3 users, in which the 3 codes were give:


For the users to submit the form, at the end, they will need to enter their respective code, ie. COde02. Once entered, the database will take note of it, and when attempted to enter again with that same code, it will not be allowed.

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yoyo12121 (June 30, 2013 at 07:18 PM)

i have a blog and im setting up a form where people can send me pictures that i might want to put on my blog, is there a way that i can restrict it so that the same person can only send one picture per day?

bhanu (August 12, 2013 at 03:16 AM)

Hello Jotform Team,

I have a same query as (yoyo12121). I have a similar requirement. Please help.


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wrafter (September 20, 2013 at 06:53 AM)

I have the same requirement as yoyou12121 and bhanu. I want to limit submissions to approx 10 in a calendar month from one IP address.

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markashton (October 17, 2013 at 03:05 PM)

Can you give these guys an answer instead of ignoring this please

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tadie92 (March 12, 2014 at 10:29 PM)

Is there a way to customize the notification that multiple submissions are not allowed?

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mgcaledonian13 (April 09, 2014 at 05:55 PM)

A previous form that I used had a strict check on any one of the fields of the form, does the loose check do this ? I have asked one of our users who has two email addresses to try a submission with the strict check and it of course blocks his submission from their other address, but when I set it to loose check they can send duplicate submission. Can you suggest that the strict check only checks for a specified duplicated field for example email address.
Willy Scott

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aptus (May 11, 2014 at 02:54 AM)

Is there a way to change this message to a custom one?

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alan120599 (May 23, 2014 at 11:10 PM)

I'm a consultant and want to create forms to send to different users who can save their answers and return to see what they have answered from time to time as a saved formed unique to them so they can refer to it as an ongoing plan that gets adjusted as they go in time?

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mrmidiot (October 17, 2014 at 01:27 PM)

Will they be able to come back the next day and submit the forma again? Or does it block them forever on strict?

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1thomh1 (March 13, 2015 at 09:12 AM)

This is great, BUT if you could trigger the email program to run when the next page button is pressed, then you could put in a box for the user to tick if they want the email, and set a conditional email to send when they press next, IF they tick that box. Better yet, if an email could send the moment they tick the box/ press a button that would be fantastic!

My only other problem is that this assumes they're being sent direct Jotform links, many of your clients, myself included, embed your forms into their own websites and don't want the user to know they're using Jotform - this wouldn't work as it only works with a jotform link!

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satyamwahi (October 17, 2015 at 02:25 PM)

I want to reset it everyday . i want it to be done automatically?????

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BMISPT (May 10, 2016 at 06:20 AM)

Good afternoon.

I have created a form.
For some reason if I follow your answer as shown above. Under the preference button I have a "Form Limits" tab(This might be a new version from the one shown above). Under this tab the "Unique Submission" option is there but as I click on it to change it, it doesn't let me. Why is this?
Please Help!!

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calebtaulbee (May 17, 2016 at 01:39 PM)

Is there a way for people to submit updates to the information they've already submitted? Lets say today my cell phone number is 555-5555 but next week it changes. Can I go in and check a box or something that says "Update my previous information" or something?

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amyf (November 17, 2016 at 11:03 AM)

When using "loose check" is the cookie being used a "Session Cookie" (cleared when the browser is closed and reopened) or "Persistent Cookie"? If it's Persistent does it expire? When?

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facturamelo (December 13, 2016 at 02:52 PM)

recibo formularios duplicados al parecer los formulario se repiten cuando el usuario vuelve atras en su navegador.

Hay forma de evitar esto?

Ya intentamos agregar un captcha pero el problema continua.

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wehad (March 07, 2017 at 03:28 PM)

أرغب في انشاء نموذج لا يقبل التعبئة بنفس رقم الهوية أكثر من مرة واحدة

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uhchockeyclub (May 31, 2017 at 05:50 AM)


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