# Custom Fields Custom fields, available for any [vault item type](https://bitwarden.com/help/managing-items/), allow you to store additional well-structured data fields for a vault item. Custom fields are saved as `Name:Value` pairs, and can be one of four types: - **Text**: Field value stores a freeform input (text, numbers, and more). - **Hidden**: Field value stores freeform input that is hidden from view (particularly useful for organizations using [hidden passwords permissions](https://bitwarden.com/help/collection-permissions/)). - **Checkbox**: (**Boolean** on some clients) Field value stores a boolean value (true/false). - **Linked**: Field value is linked to the item's username or password. Given the [right field name](https://bitwarden.com/help/custom-fields/#custom-field-names/), linked custom fields can be used to solve issues where your browser extension can't autofill usernames and passwords for a particular site ([learn more](https://bitwarden.com/help/auto-fill-custom-fields/#using-linked-custom-fields/)).> [!NOTE] custom fields for keys> **Custom fields for keys**> > In addition to common web service inputs like PINs and security questions, custom fields can be used to store values up to 5000 characters in length, for example RSA 4096-bit SSH keys.> > Character limits for custom field values are imposed on the **post-encryption character count**. For example, a 3383-character RSA-4096 Private SSH key would grow to about 4400-characters when it's encrypted and stored in your Vault. ## Creating custom fields Custom fields can be added to a vault item from any Bitwarden client using the **Custom Fields** section of the **Edit Item** panel: ![Custom fields in web app](https://bitwarden.com/assets/NoGCwyAZcnzss1EeYXKD1/23a7e619dfdcb4baa023f54923335050/2024-12-02_14-52-43.png) ### Custom field names The specified **Name** is important to get right in order to successfully [autofill a custom field](https://bitwarden.com/help/auto-fill-custom-fields/). Using the Bitwarden browser extension, you can quickly get the correct field name using the **Copy custom field name** option in the context menu (in most cases, by right-clicking on the form element): ![Copy custom field name](https://bitwarden.com/assets/5nnPLqyzgAhDCinQNB0uUC/a721194f39f0a8fa919066d73ff9e2c8/2024-10-29_10-50-34.png) Selecting this context menu option will copy the form element's `id`, `name`, `aria-label`, or `placeholder` value (in that order of preference). Once you have saved a custom field, you can [autofill it from the browser extension](https://bitwarden.com/help/auto-fill-custom-fields/). #### Find custom field names manually If you don't use the browser extension, the best way to find a field name is to use your web browser's developer tools, as in the following example: [![Vimeo Video](https://vumbnail.com/1139125687.jpg)](https://vimeo.com/1139125687) *[Watch on Vimeo](https://vimeo.com/1139125687)* To locate a custom field name: 1. On the webpage with the custom field, right-click the field you want to autofill and select **Inspect**. The HTML element will open and be highlighted in the developer console. 2. Find and copy the element `id` (find `id="xxx"`, where `xxx` is the element's `id` value). 3. In the relevant vault item's **Custom fields** section, choose the appropriate field type and select the + **New custom field** button. 4. Paste the copied element `id` in the **Name** field. 5. Specify the desired information to be autofilled (in the above example, a telephone number) in the **Value** field. 6. Save the vault item. Once you have saved a custom field, you can [autofill it from the browser extension](https://bitwarden.com/help/auto-fill-custom-fields/). ### More about custom field names #### Order of preference If you are naming a custom field manually, you should use one of the following HTML form element attributes/values **in order of preference**: 1. HTML form element's `id` attribute. 2. HTML form element's `name` attribute. 3. HTML form element's `aria-label` attribute. 4. HTML form element's `placeholder` attribute. #### Matching Field name matching is an **exact** and **case-insensitive** comparison. For example, if your custom field has the name `PIN`: - **Autofill is offered** for `pin`, `PiN`, `PIN`, etc. - **Autofill is not offered** for `pin2` or `mypin` #### Prefixing There are two cases in which you can exercise more control over [matching](https://bitwarden.com/help/custom-fields/#matching/) by using prefixes: - **csv**: Prefixing your custom field's name with `csv=` allows you to specify multiple names to search for and compare against for autofill, for example `csv=pin,mypin,pincode`. - **regex**: Prefixing your custom field's name with `regex=` allows you to perform [regular expression comparisons](https://regexone.com) when auto-fill is performed. For example, `regex=^first.*name` will offer autofill for `firstName`, `First_name`, and `First Name`.

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