Brazilian Portuguese basics
What does oi mean when translated from Portuguese?
Oi simply means hi in Brazilian Portuguese. It is the everyday greeting you use with friends, family, colleagues and shop assistants in Brazil. It is informal but not rude, and it is far more common in Brazil than olá, which sounds a little stiff in most Brazilian situations. This page shows you how to use oi naturally and how to answer it.
By Renata · November 2, 2026 · 4 min
Oi is hi, not hello in the formal sense
In Brazilian Portuguese, oi is the default casual greeting. You say it when you meet someone, when you pick up the phone, or when you walk into a shop. It works at any time of day, so you do not need to worry about morning or evening versions.
The more formal word is olá, but in Brazil olá sounds bookish or ceremonial. If you are writing an email to a company, você may prefer bom dia or boa tarde instead. For almost every spoken situation in Brazil, oi is the natural choice.
- Oi, tudo bem? Hi, how are you?
- Oi, bom dia! Hi, good morning!
- Oi, quanto custa? Hi, how much is it?
How to reply to oi
The usual reply is oi back, often followed by tudo bem? (literally 'everything good?'). You can answer tudo bem, e você? or just tudo bom. If you want to be a little more formal, say olá or bom dia.
Do not reply with oi and nothing else if you are speaking to someone older or in a service context. Add a smile and a follow-up question, such as tudo bem?, to keep it warm. Brazilians rarely leave a greeting hanging.
| Portuguese | English | When to use |
|---|---|---|
| Oi | Hi | Everyday, informal |
| Olá | Hello | Formal or written |
| Bom dia | Good morning | Morning, any register |
| Boa tarde | Good afternoon | Afternoon, any register |
| E aí? | What's up? | Very informal, friends |
| Tudo bem? | How are you? | After oi, very common |
Oi is Brazilian, olá is more European
If you look up oi in a dictionary made for European Portuguese, you may see it labelled as very informal or even as an interjection meaning 'oh'. In Portugal, people say olá far more often, and oi can sound odd or childish in some regions.
This is one of many small differences between Brazilian and European Portuguese. If your goal is to speak in Brazil, learn oi as your normal greeting. If you are preparing for a European Portuguese exam such as CIPLE, note that Brazilian usage like oi may be marked wrong.
Common phrases with oi
Oi appears in a few fixed expressions. Oi, tudo bem? is the standard friendly opener. Oi, gente! is a casual way to greet a group, common on social media and in videos. Oi, sumido! means 'hi, stranger!' to someone you have not seen in a while.
You will also hear oi? as a question meaning 'what?' or 'pardon?' when you did not understand something. In that case the intonation rises, and it is informal. For a more polite 'pardon', say como? or desculpa, não entendi.
- Oi, tudo bem? Hi, how are you?
- Oi, gente! Hi, everyone!
- Oi, sumido! Hi, stranger!
- Oi? What? / Pardon?
When not to use oi
Avoid oi in formal writing, such as a job application or a letter to a government office. Use bom dia or boa tarde, or a formal vocative like prezado senhor. In a courtroom or a very formal meeting, olá is safer than oi.
Also avoid oi with people who expect high formality, such as a much older person you have just met, unless they greet you with oi first. When in doubt, bom dia or boa tarde is never wrong in Brazil.
Learn greetings like a Brazilian
I am Renata, a Brazilian Portuguese teacher. Brazilian Portuguese is my native language, and I teach English speakers online in the evening, a few lessons per week. My capacity is small, and I say that honestly rather than as a sales trick.
I do not teach European Portuguese and I do not prepare students for CIPLE, because that exam tests European Portuguese and marks Brazilian usage wrong. If you want to greet people naturally in Brazil, I can help. The paid diagnostic lesson is 45 EUR and is credited against a later package.
Common questions
Does oi mean hi or hello?
Oi means hi. It is the everyday informal greeting in Brazilian Portuguese. Hello in a more formal sense is olá, but in Brazil olá sounds stiff in most conversations.
Is oi used in Portugal?
Oi exists in European Portuguese but is much less common and can sound very informal or odd. In Portugal, olá is the normal greeting. If you are learning Brazilian Portuguese, use oi freely in Brazil.
How do you reply to oi?
Reply with oi back, usually followed by tudo bem? You can answer tudo bem, e você? or just tudo bom. In a more formal situation, say olá or bom dia.
Is oi rude?
No, oi is not rude in Brazil. It is informal but friendly and works in most everyday situations. Avoid it in very formal writing or with people who expect high formality.
What does oi? with a question mark mean?
Oi? with rising intonation means 'what?' or 'pardon?' when you did not hear or understand something. It is informal. For a more polite version, say como? or desculpa, não entendi.
Can I use oi in an email?
In a personal email to a friend, yes. In a professional or formal email, use bom dia or boa tarde instead. Oi is too casual for business writing in most contexts.
Learning this with someone is faster
Renata teaches Brazilian Portuguese one to one, in the evening, in small numbers. A paid diagnostic lesson is 45 EUR and it is credited against a later package.
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