Do I have to quit drinking before I become Muslim?

No. You don't have to be perfect before you become Muslim. Becoming Muslim means sincerely saying the shahada, and that's it. Once you're Muslim, alcohol is forbidden, so you'll need to work on quitting. But a drinking habit is never a reason to delay accepting Islam.
Islam doesn't ask you to fix everything first
When people accepted Islam in the Prophet's ﷺ time, they didn't have to clean up their lives first. In fact, alcohol was banned in stages. Aisha explained: "If the first thing to be revealed was: 'Do not drink alcoholic drinks,' people would have said, 'We will never leave alcoholic drinks'" (Sahih al-Bukhari 4993). See Do I have to quit smoking before I become Muslim?
Faith came first. The habits followed.
Your past is forgiven
The Prophet ﷺ said: "Islam wipes out all the previous (misdeeds)" (Sahih Muslim 121). Every drink before your shahada is gone from your record.
See more in Are all my sins forgiven when I become Muslim?
After the shahada: alcohol is haram
Once you're Muslim, the rule is clear: no alcohol (Quran 5:90). If you slip up, it's a sin, not the end of your Islam. You repent, keep praying, and try again. Allah loves those who keep coming back to Him.
Don't think "I'll become Muslim once I've been sober for a year." Nobody knows how much time they have, and the shahada itself is often what gives people the strength to stop. Many converts say quitting was easier after Islam than before. See Do I need to be circumcised to become Muslim?
Practical ways to quit
- Clear your home: pour it out or give unopened bottles away. Don't sell them.
- Change the routine: swap after-work drinks for the gym, coffee or a walk. See Can I go to a bar with friends if I only drink soda?
- Lean on prayer: the five daily prayers give your day a new rhythm.
- Find people: a mosque convert circle or a Muslim friend who checks in on you.
- Get help if it's an addiction: talk to a doctor. Stopping heavy drinking suddenly can be dangerous, and medical support is completely in line with Islam.
- You don't need to quit before saying the shahada.
- Islam wipes out your past.
- After becoming Muslim, alcohol is forbidden.
- Quitting is a journey; get support if you need it.
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