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Manage cookies for Forms

Introduces cookies and their usage in Optimizely Forms.



Optimizely Forms is only supported by MVC-based websites and HTML5-compliant browsers.

Cookie usage in Optimizely Forms

Optimizely Forms uses the following cookies:

  • .EPiForm_VisitorIdentifier – Functionality-related. Identifies the form submission to the site when a visitor submits data through an Optimizely form. Stores a GUID, which is the visitor identifier. Persistent (90 days from creation).
  • .EPiForm_BID – Functionality-related. Identifies the form submission made to the site when a visitor submits data through an Optimizely form. Stores a GUID as the browser ID. Persistent (90 days from creation).
  • EPiForm_{FormGuid}:{Username} – Functionality-related. Stores partial form submissions so visitors can continue with a form submission upon return. One cookie is created for each form and visitor who is logged in. Stores the current submission status of the form (formGuid, submissionID, and if the submission is finalized or not). Persistent (90 days from creation).



The following are internal cookies (implemented by below service classes) and should not be touched. If you really need to, change the class to your implementation.

  • EPiServer.Forms.Core.Internal.ProgressiveSubmitInfoService
  • EPiServer.Forms.Core.Internal.VisitorIdentify.DefaultVisitorIdentifyProvider

You can set up a time to expire these cookies by changing the value of visitorSubmitTimeout in Forms.config. The default is 90 days.

Protect visitors' privacy

According to EU directives, website owners are responsible for informing visitors about cookies used on the site. See Protect your visitors' privacy according to EU directive on cookies.