Mostly in SharePoint Public Sites Scenarios, You will look for a solution where to hide the Admin Ribbon of the SharePoint Site. Basically the site itself should not have the Admin panel shown to anonymous users accessing from outside which can be only shown up on the level of permissions of the user logged in to the Site (Mostly Internal Domain Users)

If you have developed you own Masterpage, this has to be done there.
To do this, Simply open the Site using SharePoint Designer. Locate your Master Page (which has been set as the Default) Find below two Controls in MasterPage.
Dont forget to Keep a Copy of the Master page before you start editing.

Then Edit the PermissionString from its defined value (ManageWeb) to the new value based on your permission requirements. In this sceanrio it defined to “AddListItems” Value which is the new permission Level. from now on, the Ribbon will be only Visible for thoese who has AddListItems permision Level. To any other level it will be hidden.
In Below sceanrio, Anonymous User wont be able to see the Ribbon as it defined to hide for everyone does not have “AddListItems” Permission level. However you have to carefully look at the list of permission levels supported in “SecurityTrimControl” which has been listed below.
———————————————— Grey Bar (Ribbon Row)
<SharePoint:SPSecurityTrimmedControl ID=”HideRibbonRow” runat=”server” PermissionsString=”ManageWeb”>
document.getElementById(“s4-ribbonrow”).style.display = “block”;
</SharePoint:SPSecurityTrimmedControl>
———————————————— Blue Bar (Suit bar)
<SharePoint:SPSecurityTrimmedControl ID=”HideSuiteBar” runat=”server” PermissionsString=”ManageWeb”>
document.getElementById(“suiteBar”).style.display = “block”;
Once edited the Permission, simply save and Publish the MasterPage and test it out. if you have defined permission peroperly to your users, it will work perfectly.
Below are the full list of permission levels suported by the “SecurityTrimControl”
EmptyMask – Has no permissions on the Web site. Not available through the user interface.
ViewListItems – View items in lists, documents in document libraries, and view Web discussion comments.
AddListItems – Add items to lists, add documents to document libraries, and add Web discussion comments.
EditListItems – Edit items in lists, edit documents in document libraries, edit Web discussion comments in documents, and customize Web Part Pages in document libraries.
DeleteListItems – Delete items from a list, documents from a document library, and Web discussion comments in documents.
ApproveItems – Approve a minor version of a list item or document.
OpenItems – View the source of documents with server-side file handlers.
ViewVersions – View past versions of a list item or document.
DeleteVersions – Delete past versions of a list item or document.
CancelCheckout – Discard or check in a document which is checked out to another user.
ManagePersonalViews – Create, change, and delete personal views of lists.
ManageLists – Create and delete lists, add or remove columns in a list, and add or remove public views of a list.
ViewFormPages – View forms, views, and application pages, and enumerate lists.
Open – Allow users to open a Web site, list, or folder to access items inside that container.
ViewPages – View pages in a Web site.
AddAndCustomizePages – Add, change, or delete HTML pages or Web Part Pages, and edit the Web site using a SharePoint Foundation compatible editor.
ApplyThemeAndBorder – Apply a theme or borders to the entire Web site.
ApplyStyleSheets – Apply a style sheet (.css file) to the Web site.
ViewUsageData – View reports on Web site usage.
CreateSSCSite – Create a Web site using Self-Service Site Creation.
ManageSubwebs – Create subsites such as team sites, Meeting Workspace sites, and Document Workspace sites.
CreateGroups – Create a group of users that can be used anywhere within the site collection.
ManagePermissions – Create and change permission levels on the Web site and assign permissions to users and groups.
BrowseDirectories – Enumerate files and folders in a Web site using Microsoft Office SharePoint Designer 2007 and WebDAV interfaces.
BrowseUserInfo – View information about users of the Web site.
AddDelPrivateWebParts – Add or remove personal Web Parts on a Web Part Page.
UpdatePersonalWebParts – Update Web Parts to display personalized information.
ManageWeb – Grant the ability to perform all administration tasks for the Web site as well as manage content. Activate, deactivate, or edit properties of Web site scoped Features through the object model or through the user interface (UI). When granted on the root Web site of a site collection, activate, deactivate, or edit properties of site collection scoped Features through the object model. To browse to the Site Collection Features page and activate or deactivate site collection scoped Features through the UI, you must be a site collection administrator.
UseClientIntegration – Use features that launch client applications; otherwise, users must work on documents locally and upload changes.
UseRemoteAPIs – Use SOAP, WebDAV, or Microsoft Office SharePoint Designer 2007 interfaces to access the Web site.
ManageAlerts – Manage alerts for all users of the Web site.
CreateAlerts – Create e-mail alerts.
EditMyUserInfo – Allows a user to change his or her user information, such as adding a picture.
EnumeratePermissions – Enumerate permissions on the Web site, list, folder, document, or list item.
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p align=”justify”>FullMask – Has all permissions on the Web site. Not available through the user interface.