What tool can I use to extract Field Level Security information

Hi,

FORCE CLI with Sublime Text 3 Method:
Fetch the profile you would like to edit by doing Right Click > Lightning > Fetch > Metadata then select Profiles, next select the profile you wish to Fetch. Afterwords edit the profiles/Admin.profile file (or whichever one you fetched), and add the field permissions you need.

<fieldPermissions>
<field>Custom_Object__c.Custom_Field__c</field>
<editable>true</editable>
<readable>true</readable>
<hidden>false</hidden>
</fieldPermissions>

Hope this helps.