A birth certificate may be obtained from the Office of the Mayor (La Mairie) at the place of birth. The request should be in French.
The request must be accompanied by a self-addressed stamped envelope. There is no charge for a copy of a birth certificate.
According to French laws, everybody is entitled to order a birth certificate without the names of the parents. A birth certificate with mention of the parents or a copy of the birth register may be ordered only by the concerned person himself or herself, the ancestors (parents, grand parents etc.), the descendants (children, grand children etc.) and the spouse (wife or husband).
French birth certificates inform also about further events occurred later on in the life of the concerned person, as marriage, divorce, separation, acquisition or loss of French nationality and death ("mentions marginales").
A request for a birth certificate must include: (a) the applicant's full name at the time of birth; (b) the date and place of birth; (c) father's full name; (d) mother's full name at the time of the applicant's birth, including maiden name. The request must be accompanied by a self-addressed stamped envelope. There is no charge.
A birth certificate is required when applying for various documents e.g. passport, national ID
https://www.acte-etat-civil.fr/DemandeActe/Accueil.do
https://mdel.mon.service-public.fr/acte-etat-civil.html
http://www.renaca.ch/docu-france-en.html