# Pre-fill
This option allows each user to manually define, from the web or mobile, a default value for the fields that have been authorized for pre-filling by the administrator in the form.
Thus, each file created will contain the default values defined by the user who can modify if necessary.
## Configuration
In the advanced field options, a checkbox is available to make it pre-fillable:
For a user to access the pre-fill configuration menu on mobile, a button must be added to the [customized application](/user-documentation/build/building-apps/app-configuration.md) whose action is "Autofill":
**List of fields not compatible with pre-filling:**
* Picture
* File
* Relationship
## Use on the web
From the form view, you will find the "Pre-fill" top right:
After clicking on the "Pre-fill" button, you will find a form with only the fields checked as pre-fillable in the form:
You can click Edit, enter values then Save:
## Use on mobile
On the custom application with the "Pre-fill" action button, click on it.
{% tabs %}
{% tab title="Android" %}
If you have several forms, select the one of your choice and fill in the desired values then click on the arrow at the top left when you are finished:
{% endtab %}
{% tab title="iOS" %}
If you have several forms, select the one of your choice and fill in the desired values then click on the arrow at the top left when you are finished:
{% endtab %}
{% endtabs %}
**Attention: if you delete the logged-in account from the mobile/tablet, the pre-filled values will be lost.**
{% hint style="info" %}
Pre-fills are linked to the form's [version](/user-documentation/components-concepts-terminology.md#version). If the form's version changes, we recommend deleting existing pre-fills, synchronizing the device, and possibly creating new ones.
{% endhint %}
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