Is it necessary to include a checkbox in my contact form?
No. A checkbox is not necessary. The 'Submit' button is enough.
If you are clear about the fact that the contact form is a contact form, then the action of clicking the "Submit" button already means that they are consenting to the processing of the data.
However, it is necessary to include a text next to the form, such as:
We will process your data to contact you and inform you about our products and services. You can revoke consent, exercise your rights of access, rectification, opposition, limitation of treatment, portability, and deletion by writing to us at [email address]. More information in the Privacy Policy of our Legal Hub.