You can try the DELF diploma for the levels A1-B2.
You can find easily information by googling.
The principal page is:

http://www.ciep.fr/delf-dalf

or

http://www.ciep.fr/en/delf-dalf

In brief, B1 is the minimum level required by French universities in order to accept a student, although they are some disciplines that they demand level C1 (DALF).

For information about the classification of language levels see here for instance:

https://www.france-langue.fr/niveaux-de-francais/

https://www.coe.int/en/web/common-european-framework-reference-languages/level-descriptions

There are also other diplomas recognized in France and abroad as well such as Test de Connaissance de Langue Française.

http://www.ciep.fr/tcf

Here is a good description of possible certifications https://www.fle.fr/Les-tests-et-certifications-de-FLE (sorry for the link but there’s no way to cut and paste all that).

You can of course get basic certifications via the Alliance Francaise, but beware that it’s usually the most expensive solution possible. And the quality of the teaching is very dependent on the location, so it may not be the best for you. At the same link, note the resources to prepare yourself online..