Yes. In Jain Dharma, you can call yourself a Jain if:

1. You truly accept Jain beliefs

- Faith in the Tirthankaras (like Bhagwan Mahavir) as the teachers of the path to moksha. - Acceptance of the Three Jewels: - Samyak Darshan – Right Faith - Samyak Jnan – Right Knowledge - Samyak Charitra – Right Conduct ( jainknowledge.com)

1. You sincerely try to live by Jain principles

At least at a basic lay (shravak/shravika) level: - Ahimsa: non‑violence, vegetarian (ideally Jain-style ahimsak) food. - Satya, Asteya, Brahmacharya, Aparigraha in daily life. ( jainknowledge.com)

1. You begin Jain practices

- Reciting Navkar Mantra with respect. - Trying Samayik (short time of equanimity/meditation). - Doing pratikraman / self‑reflection and asking forgiveness. ( jainknowledge.com)

1. No compulsory “conversion ceremony”

- Jainism has no fixed baptism or conversion ritual. Becoming Jain is based on inner conviction and ongoing practice, not on a one‑time external rite or certificate. ( jainknowledge.com)

So, if you are born Hindu but now honestly adopt Jain faith and start following Jain vows and practices, you can rightly and respectfully call yourself a Jain.

If later you need it for documents, usually a letter from a Jain Sangh/Derasar confirming that you follow Jain Dharma is used, not a religious “conversion paper.” ( jainknowledge.com)

You can read a simple guide on adopting Jain Dharma and practice here