Who Actually Needs One, the Documents, the Fee and the VIVIS Process
The single most important fact about a Brazil visit visa from Dubai is that Brazil decides by your passport, not by your residence. Your Emirates ID and your years in the UAE do not move you onto a different list. Some UAE residents fly to Brazil with no visa at all, some apply online, and some must attend the Brazilian Embassy in Abu Dhabi in person. This guide sorts you into the right route first, then covers the visitor visa itself, known as the VIVIS: the documents, the bank balance question everyone asks, the fee and why it has no single answer, the realistic timeline, and the yellow fever rule that catches people on the way home rather than on the way out.
It depends on your passport, not your UAE residence. Brazil applies visa policy by nationality, on reciprocity. Emirati, Filipino, British and most EU passports are visa-free for 90 days. Indian, Pakistani, Sri Lankan, Bangladeshi, Nepali and Egyptian passports need a visa.
Source: gov.br, Ministry of Foreign AffairsOnly if you hold a US, Canadian or Australian passport. Those three nationalities use the eVisa at brazil.vfsevisa.com. Every other visa-required nationality in the UAE files a consular VIVIS through the Brazilian Embassy in Abu Dhabi.
Source: gov.br, Embassy of Brazil in Abu DhabiThe Embassy of Brazil in Abu Dhabi, which holds consular jurisdiction over all seven Emirates. There is no Brazilian consulate in Dubai, so a Dubai resident applies to Abu Dhabi. The application starts online through the e-consular portal.
Source: Embassy of Brazil in Abu DhabiThe Embassy states about 5 business days to analyse your file, then an interview, then a minimum of 5 business days to issue. Across 186 files from our Dubai desk the median processing observed was 10 working days, excluding the appointment gap. Clearance nationalities can take up to 30 days.
Source: Embassy of Brazil in Abu DhabiArabiers first-party data, n=186There is no single Brazil visa fee. Brazil charges by reciprocity, meaning your nationality pays roughly what your country charges Brazilians. Two colleagues in the same Dubai office can pay different amounts. Fees are non-refundable whatever the outcome.
Source: Itamaraty, consular fees on reciprocityUp to 90 days per visit, whether you travel visa-free or on a VIVIS. The hard ceiling is 180 days in any 12-month period. Extensions are requested from the Federal Police inside Brazil, before your current stay expires.
Source: gov.br, Brazilian Federal PoliceWhether you need a Brazil visit visa from Dubai is decided by the nationality of your passport, not by the fact that you live in the UAE. Brazil's Ministry of Foreign Affairs is explicit on this point: visa policy is applied to visitors according to their nationality, on the principle of reciprocity, and the relevant fact for a visa request is the nationality rather than the country that issued the passport. Long residence in Dubai, an Emirates ID and a golden visa change nothing about which list Brazil puts you on.
This is worth stating plainly because it cuts both ways, and both surprises are common in our Deira office. A Filipino colleague who assumed she needed a visa does not need one. An Indian colleague who assumed his ten-year UAE residence would help still files a full consular application. Residence is not a shortcut and it is not a penalty. It is simply not the question Brazil is asking.
Source: Ministry of Foreign Affairs of Brazil (Itamaraty), gov.br visitor visa guidance. Confirm your own nationality against Brazil's official country list before you book anything.

Every UAE resident travelling to Brazil falls onto one of four routes. Find yours before you read anything else on this page, because the documents, the cost and the timeline are completely different depending on where you land.
The table below sets out the same thing for the nationalities we see most often across our Dubai, Delhi and Colombo desks. It is a guide to the shape of the rules, not a substitute for the official list, which is the only list that binds.
| If you hold this passport | Visa needed for Brazil? | How you apply from the UAE |
|---|---|---|
| United Arab Emirates | No | Nothing to apply for. Fly on the passport. |
| Philippines | No | Nothing to apply for, under a bilateral waiver. |
| United Kingdom, EU states, Japan, South Africa, Qatar, Israel, Malaysia, Russia, Hong Kong | No | Nothing to apply for. Check your own entry on the official list. |
| United States, Canada, Australia | Yes | eVisa, online only, at the official VFS eVisa portal. |
| India, Pakistan, Sri Lanka, Bangladesh, Nepal, Egypt | Yes | Consular VIVIS through the Embassy of Brazil in Abu Dhabi. |
| China | Changing | A temporary exemption and a phased eVisa are both in play. Check the current position before booking. |
Source: Itamaraty visa-exempt country list and Brazilian entry rules.
Brazil's visitor visa is called the VIVIS, from visto de visita. It is one visa covering many purposes, which surprises people who expect a separate tourist visa and business visa. Under Brazil's migration law the old tourist and business categories were merged into a single visitor visa, so the same VIVIS covers a holiday, a family visit and a week of meetings.
| A VIVIS covers | A VIVIS does not cover |
|---|---|
| Tourism, including visiting relatives and friends | Any paid work in Brazil |
| Business: meetings, trade fairs, signing contracts, audits, consulting | Being hired by a Brazilian employer |
| Conferences, seminars, academic and scientific events | Stays beyond 90 days per visit |
| Unpaid artistic and sporting participation | Immigration or settling in Brazil |
| Volunteer work, research, short study | Paid technical assistance, which needs a VITEM V |
| Transit through Brazil where required | Salaried activity of any kind |
The rule on money is narrower than most people read it. A VIVIS holder is forbidden from paid work in Brazil, but is allowed to receive certain payments: daily allowances for living expenses, artistic fees for performances, compensation for managing their own business, reimbursement of travel expenses, and prizes won in sporting, artistic or cultural competitions. If any Brazilian source will pay you anything, say so in the application and document it, because the consular officer decides whether that payment is compatible with a visitor visa.
Source: Itamaraty visitor visa guidance and Embassy of Brazil in Abu Dhabi, visitor visa page.
This is the consular route, Route D. If you hold a US, Canadian or Australian passport your process is different and entirely online, so skip to the note at the end of this section. Everyone else follows the same six stages, which start online and end in person in Abu Dhabi.
Source: Embassy of Brazil in Abu Dhabi, visas page and e-consular portal.
You do not submit it in Dubai. Brazil's only consular post in the United Arab Emirates is the Embassy of Brazil in Abu Dhabi, and its jurisdiction covers all seven Emirates. A resident of Dubai, Sharjah, Ajman, Ras Al Khaimah, Fujairah or Umm Al Quwain applies to Abu Dhabi, and attends in Abu Dhabi if an appearance is required.
This matters because several visa pages aimed at Dubai residents refer to a "Consulate General of Brazil in Dubai" and invite you to apply there. There is no such post. There is also no VFS or BLS visa application centre in Dubai handling consular Brazil visas: VFS Global's role in Brazil's system is running the eVisa portal for US, Canadian and Australian passport holders, which is a different thing entirely and involves no counter in Dubai.
Source: Embassy of Brazil in Abu Dhabi, which states its jurisdiction covers the seven Emirates.
The core document set for a consular VIVIS filed in Abu Dhabi is short, and the Embassy is strict about it being complete on the day. Everything uploaded online must also be produced as originals at the appointment, and an application missing any item will not be accepted.
| Document | What the Embassy expects |
|---|---|
| Passport | Valid at least six months, with at least two blank visa pages |
| Visa application form and receipt | One form per applicant, completed online, receipt printed, signed, with the photograph glued on |
| Photograph | Recent, white background, uploaded to the form as well as attached to the receipt |
| UAE residence proof | Your UAE residence visa and Emirates ID, evidencing that you are applying where you live |
| Return air ticket | A reservation is enough. It must show your name, flight numbers and the dates into and out of Brazil |
| Proof of consular fee payment | A legible copy of the payment, made as instructed at the last step of the form |
| Proof of financial means | Bank statements covering your stay. See section 8, and note the Federal Police may want each page bank-stamped |
| Accommodation or invitation | Hotel booking, or an invitation from your host if you are staying with family or friends |
| If self-employed | Your trade licence plus a letter on the company letterhead of the company you own or are a partner in |
For a business trip, expect the host side to carry weight: a letter from the Brazilian company on its letterhead describing the purpose and dates of the visit, and confirming that you will not be performing salaried work or paid technical assistance, which would require a different visa class. Get that letter aligned with your stated dates before you file, because a mismatch between the invitation and the itinerary is a slow, avoidable problem.
Source: Embassy of Brazil in Abu Dhabi, visitor visa page.

The passport you present with a visa application in Abu Dhabi must be valid for at least another six months and must have at least two blank visa pages. That is the Embassy's rule for the application, and it applies whether or not your nationality needs a visa: the Embassy asks visa-exempt travellers to make sure their passport is valid for more than six months too.
There is one quiet piece of good news that saves people a wasted trip. Brazilian law looks at validity on the date of entry and for the duration of your stay, and does not demand extra validity after the trip ends. And if your Brazilian visa is still valid when your passport expires, the visa can still be used: you present it in Brazil alongside a new valid passport issued by the same country as the old one. You do not automatically lose the visa with the passport.
Source: Embassy of Brazil in Abu Dhabi and Itamaraty visitor visa guidance.
There is no official minimum bank balance for a Brazil visit visa, and any figure quoted as "the requirement" is somebody's rule of thumb rather than Brazilian law. What does exist is a published daily benchmark at the border: visitors are expected to show proof of funds of at least a set amount per day of stay, alongside a ticket in and out and proof of accommodation. Officers are looking for resources compatible with the trip you have described, not a magic number.
What actually helps a file from Dubai is the shape of the statement rather than the size of the closing balance. Salary landing on the same date each month, a balance that has been there for months rather than appearing last Tuesday, and spending that looks like your real life. A sudden deposit shortly before submission raises the question it was meant to answer. If somebody else is funding the trip, document that relationship properly instead of moving their money into your account. This is not a hunch: money is the single biggest theme in the Brazil files we handle, and section 9 sets out our own figures on exactly how it goes wrong.
Two practical notes specific to this route. The Brazilian Federal Police may ask for the financial statement to be stamped by the bank on each page as proof that the information is genuine, so get the stamped version rather than a screenshot. And the Embassy makes a point that is easy to miss when you are budgeting: the dirham is not easily exchanged in Brazil, so it recommends travelling with international debit or credit cards and with US dollars or euros rather than expecting to change AED on arrival.
Sources: Brazilian entry conditions for visitors, Itamaraty; Embassy of Brazil in Abu Dhabi on financial means and currency.
The previous section says there is no official minimum bank balance, which is true, and which is where most guides stop. It leaves the obvious question unanswered: if there is no number to hit, what actually goes wrong? We can answer that from our own desk rather than from guesswork, because we keep a record of it.
One finding dominates, and it reframes the whole bank balance question. Money accounts for more than half of everything we see: financial circumstances that did not support the proposed trip, at 27.4 percent, plus unclear bank activity or source of funds, at 23.1 percent, together make up 50.5 percent of primary concerns. The largest single concern is not that the applicant had too little money. It is that the money did not match the trip being described.
That distinction is the practical heart of this page. A file showing a modest but steady salary and a modest, realistic ten-day itinerary reads well. A file showing a thin account and a three-week itinerary across four Brazilian cities does not, and neither does a healthy balance that arrived last week from a source the statement does not explain. Both are money problems, and neither is solved by a bigger number.
The last row is the one that should not exist at all. Missing documents or inconsistencies, at 11.8 percent, is entirely self-inflicted, and the Embassy in Abu Dhabi does not work around it: an application missing any document is not accepted on the day, and you go back into the booking window. That is the cheapest 11.8 percent of problems anyone will ever fix.
Source: Arabiers first-party case data, Dubai desk, 24-month reporting period. Own operational figures, not official Brazilian statistics.
There is no single Brazil visa fee, and that is the honest answer to the most-asked question on this topic. Brazil sets consular fees by reciprocity: your nationality pays broadly what your country charges Brazilian citizens for the equivalent visa. Two colleagues sitting at the same desk in Dubai, applying for the same VIVIS on the same day for the same holiday, can pay different amounts because they hold different passports.
That is why the fee tables you find online disagree with each other so wildly, and why we will not print a number here that we cannot stand behind for your specific passport on the day you apply. The fee for your nationality is confirmed to you inside the e-consular flow before you pay, and that is the figure that counts.
| What is fixed | What varies |
|---|---|
| The fee is non-refundable, whatever the outcome | The amount, by your nationality, on reciprocity |
| Payment is made as instructed at the last step of the form | The eVisa route, which has its own single published fee |
| Visitor visas for diplomatic and official passport holders are free of charge | Whether extra consular charges apply in particular cases |
Sources: Itamaraty consular fee guidance on reciprocity; Brazilian mission payment-identification rules.
The Embassy in Abu Dhabi publishes its own timings, and they describe a sequence rather than a single number. Your file is analysed in about 5 business days after upload. Once validated, you book an appointment, and the system will only show slots inside the next 45 days. After the appointment, issuance takes a minimum of 5 business days if the visa is authorised. Where your nationality requires clearance from Brazil, issuance can take up to 30 days.
Add those together honestly and the floor is roughly two working weeks of official processing, with the appointment gap sitting unpredictably in the middle and the clearance case stretching the tail. The Embassy's own advice is to plan in advance, and it notes that processing takes at least 5 business days.
Our own record matches that floor rather than beating it. Across 186 Brazil visitor visa applications reviewed from our Dubai office over 24 months, the median processing time we observed was 10 working days, measured from a complete e-consular upload to the visa being issued. That figure deliberately excludes the appointment gap, because the gap depends on slot availability rather than on processing, and folding it in would flatter the number. Read it as a realistic middle for a clean file rather than a promise: half the files we saw took longer, and no agency controls this timeline. The full dataset is in section 9.
| Stage | What the Embassy states | What it means for your dates |
|---|---|---|
| Document analysis | About 5 business days | Starts when your upload is complete, not when you begin |
| Appointment booking | Slots only inside the next 45 days | You cannot lock a slot months ahead for Carnival |
| Issuance after interview | Minimum 5 business days | A minimum, not a promise |
| Nationalities needing clearance | Up to 30 days | The single biggest variable. Plan for it if it applies to you |
Source: Embassy of Brazil in Abu Dhabi, visas page.
Two nationality-specific rules change the shape of the process for a large share of UAE residents, and neither is well covered elsewhere.
Some nationalities must apply in person. The Embassy in Abu Dhabi lists nationalities required to attend personally rather than submit through anyone else. The list includes Afghan, Egyptian, Eritrean, Ethiopian, Iranian, Iraqi, Jordanian, Lebanese, Libyan, Nepalese, Nigerian, North Korean, Pakistani, Palestinian, Senegalese, Sudanese and Syrian passport holders. If you hold one of these passports, no agency can attend in your place, and any provider suggesting otherwise is describing something the Embassy does not permit.
Some nationalities need clearance from Brazil. Where a nationality requires clearance, the Embassy states issuance can take up to 30 days rather than the 5-business-day minimum. This is the difference between a comfortable plan and a missed flight, and it is the single most useful thing to establish about your own passport before you book anything.
Source: Embassy of Brazil in Abu Dhabi, visitor visa page.
Brazil applies a strict parental-authorisation regime, and it is stricter than most families expect. For applicants under 18, the visa requires the written authorisation of both parents, who must sign the visa application form in front of the Brazilian consular authority. If a parent cannot attend the Embassy, that signature can be attested by their own embassy and then legalised by the UAE Ministry of Foreign Affairs, which is a real errand with a real lead time. Start it early.
The one relief: children under 12 do not have to appear at the Embassy themselves. Their parents or legal guardians can request the visa for them. That removes the child from the trip to Abu Dhabi, but it does not remove the authorisation requirement from the parents.
Source: Embassy of Brazil in Abu Dhabi, visitor visa page.
Validity and permitted stay are two different things, and conflating them is the most common way visitors overstay by accident. The VIVIS is normally issued for multiple entries. Its validity period, meaning the window in which you can travel, is generally one year, though it can be longer for some nationalities. Your permitted stay is separate: a maximum of 90 days per visit.
Over any 12-month period the combined total is capped at 180 days. If you want to stay past the 90 days you were admitted for, you request an extension from the Federal Police inside Brazil, and you must do it before your current authorised stay expires. You cannot fix it afterwards, and you cannot push past the 180-day annual ceiling.
| Question | Answer |
|---|---|
| How long is the visa valid? | Generally one year, longer for some nationalities. Multiple entries are normal |
| How long can I stay per visit? | Up to 90 days |
| What is the annual ceiling? | 180 days total in any 12-month period |
| Can I extend? | Yes, at the Federal Police in Brazil, before your current stay expires |
| Does a visa guarantee entry? | No. Brazil states a visa is not a right to enter, only an expectation of being admitted |
Source: Itamaraty and Brazilian Federal Police guidance on visitor stays and extensions.
If you are only changing planes and never leave the international transit area, no visa is required, whatever your nationality. That is a clean rule and it is worth knowing if you are routing through Sao Paulo to somewhere else in South America.
The moment you pass immigration, the rule flips. If your onward journey requires you to clear immigration and re-check, or you are on separate tickets, you are entering Brazil and you need whatever your nationality needs to enter Brazil. Travellers on separate tickets are the ones who get caught, because their bags are not through-checked and they have no choice but to enter.
Sources: Itamaraty on airport transit; Consulate General of India, Sao Paulo, travel advisory.
Brazil does not require a yellow fever certificate to enter. The Embassy in Abu Dhabi says so directly: Brazil does not require an International Certificate of Vaccination or Prophylaxis for entry, though vaccination is recommended, and the vaccine should be taken at least 10 days before departure. Most guides stop there, and that is where they leave UAE residents exposed.
The problem is not going to Brazil. It is what several countries require of travellers arriving from Brazil, which the World Health Organization classifies as a yellow fever risk country. Those requirements bite on the return leg or on the onward leg, and for a UAE resident whose family and home country sit in South Asia, that is precisely the leg that matters most.
| Arriving in | The position on travellers coming from Brazil |
|---|---|
| India | The Consulate General of India in Sao Paulo states plainly that while Brazilian authorities may not ask for the yellow fever certificate, it is mandatory for re-entry into India. India's health authorities quarantine arrivals who lack a valid certificate until it becomes valid, or for up to six days from last possible exposure |
| Sri Lanka | Travellers who have visited or transited a yellow fever endemic country, and Sri Lanka's immigration authority lists Brazil among them, are required to hold a valid certificate on arrival |
| Pakistan, Bangladesh and others | Appear on the WHO list of countries requiring proof of vaccination from travellers arriving from risk countries. Check your own before you fly |
| United Arab Emirates | This one applies to your own trip home. Under the International Health Regulations, proof of yellow fever vaccination is required for travellers aged 9 months or over arriving in the UAE from a country at risk of yellow fever transmission, and for those who transited more than 12 hours through an airport in such a country. Brazil is on the WHO risk list, so a Dubai resident returning from Brazil is within the rule |
Sources: Embassy of Brazil in Abu Dhabi on Brazilian entry; Consulate General of India, Sao Paulo; Department of Immigration and Emigration, Sri Lanka; UK National Travel Health Network and Centre on the UAE certificate requirement; World Health Organization, International Health Regulations. This is general travel information and not medical advice: check your own itinerary and speak to a certified yellow fever vaccination centre.

A visa is permission to ask, not permission to enter. Brazil states this openly: the issuance of a visa is a discretionary act of a sovereign state, and a visa is not a right of entry but an expectation of being admitted. The decision at the airport belongs to the Brazilian Federal Police, who run every port of entry, and they can ask for the same things the visa asked for.
Carry an arrival pack in your hand luggage rather than in your checked bag: the return ticket, the hotel booking or host's address, evidence of funds, and your travel insurance if you have it. This is not paranoia. Brazilian entry conditions require visitors to hold a ticket in and out, proof of accommodation or a notarised invitation, and proof of funds, and those conditions apply to visa-free visitors exactly as they apply to visa holders.
Sources: Embassy of Brazil in Abu Dhabi; Itamaraty entry conditions.
This topic has unusually poor information around it, partly because Brazil changed its rules for three major nationalities in April 2025 and the internet has not caught up, and partly because a lot of pages about it were written quickly and never checked. These are the claims we correct most often, with what the government sources actually say.
People search for the best visa agency in Dubai for a Brazil visa, and the honest position is the same one we take on every visa page here: no agency is the Embassy, and no agency can approve your visa. Brazil is explicit that issuing a visa is a discretionary act of a sovereign state. Anyone guaranteeing you a Brazilian visa is telling you something they cannot know.
It is also worth saying that a lot of Brazil files do not need an agency at all. If you hold a visa-free passport, there is nothing to apply for and nothing for anyone to charge you for. If you hold a US, Canadian or Australian passport, the eVisa is a form you can complete yourself in an evening at the official portal.
| How to check a provider is legitimate | What to look for |
|---|---|
| A real trade licence you can verify | Ours is DET 1176592, verifiable on the Dubai business portal |
| A physical office you can walk into | No address, no visible licence and cash-only payment are warning signs |
| Honesty about the fee route | The consular fee must be paid from your own account in your own name, or it is lost. Anyone vague about this is a risk to your money |
| No claim to attend for you where you must attend | If your nationality is on the personal-appearance list, nobody can go instead of you |
| No guarantee of approval | Nobody can promise a Brazilian visa. The consular officer decides |

It depends on your passport, not your UAE residence. Brazil applies visa policy by nationality, on reciprocity. Emirati, Filipino, British, EU and many other passport holders travel visa-free for up to 90 days. US, Canadian and Australian passport holders need an eVisa. Indian, Pakistani, Sri Lankan, Bangladeshi, Nepali and Egyptian passport holders need a consular visitor visa, called a VIVIS.
Complete the visa application form on the Brazilian government form portal, create an account on the e-consular system for the Embassy of Brazil in Abu Dhabi and upload your documents. The Embassy analyses the file in about 5 business days, then you book an appointment within the 45-day booking window, attend in Abu Dhabi with all original documents, pay the consular fee, and collect the passport. Issuance takes a minimum of 5 business days after the appointment.
Only if you hold a US, Canadian or Australian passport, which can use the eVisa at the official portal brazil.vfsevisa.com without visiting the Embassy. Every other visa-required nationality starts online through the e-consular portal but finishes in person at the Embassy of Brazil in Abu Dhabi.
You do not submit it in Dubai. There is no Brazilian consulate in Dubai. The Embassy of Brazil in Abu Dhabi is Brazil's only consular post in the UAE and its jurisdiction covers all seven Emirates, so residents of Dubai apply to Abu Dhabi.
There is no single fee. Brazil charges consular fees by reciprocity, meaning your nationality pays broadly what your country charges Brazilian citizens, so two applicants in the same Dubai office can pay different amounts. The fee for your passport is confirmed within the e-consular flow before payment. Fees are non-refundable whatever the outcome, and visitor visas for diplomatic and official passport holders are free of charge.
There is no official minimum balance. Brazil applies a published per-day funds benchmark at the border alongside a ticket in and out and proof of accommodation. What helps a file is a steady statement that matches your life in the UAE rather than a large sum deposited shortly before applying. The often-quoted $2,000 figure comes from US eVisa sponsor guidance and is not a rule for UAE residents.
The Embassy states about 5 business days to analyse the uploaded file, then an appointment booked within a 45-day window, then a minimum of 5 business days to issue the visa after the appointment. For nationalities that require clearance from Brazil, issuance can take up to 30 days. Plan several weeks, not several days.
Up to 90 days per visit, with a ceiling of 180 days in any 12-month period. The visa itself is usually multiple entry and generally valid for one year, though longer for some nationalities. An extension is requested from the Brazilian Federal Police inside Brazil before your current authorised stay expires.
No. The Philippines and Brazil have a bilateral visa waiver, so Filipino passport holders travel to Brazil visa-free for up to 90 days. You still need a return ticket, proof of accommodation and proof of funds at the border, because Brazil applies the same entry conditions to visa-free visitors as to visa holders.
Yes. A Pakistani passport requires a visitor visa for Brazil, and Pakistani passport holders appear on the Embassy's list of nationalities that must apply in person in Abu Dhabi. No agency can attend in your place. Your UAE residence does not change either requirement.
It is procedural rather than adversarial. There is no interview-by-default and no refusal ground equivalent to the US 214(b). The friction sits in the sequence: a complete upload, the 45-day appointment window, the personal appearance where it applies, and clearance from Brazil where the nationality requires it. Applications go wrong through incomplete files and unrealistic bookings far more often than through judgement calls.
Brazil does not publish refusal reasons by country of residence, so we can only speak to what we see. Across 186 Brazil visitor visa applications reviewed from our Dubai office over 24 months, money was the dominant theme: financial circumstances that did not support the proposed trip at 27.4 percent, plus unclear bank activity or source of funds at 23.1 percent, together account for 50.5 percent of primary concerns. Purpose of travel not being sufficiently explained followed at 19.9 percent, weak evidence of reasons to return to the UAE at 17.7 percent, and missing documents or inconsistencies at 11.8 percent. These are our own operational figures, not Brazilian government statistics, and every decision is made by a consular officer.
Brazil does not require a yellow fever certificate to enter, though vaccination is recommended and takes 10 days to become effective. The certificate matters on the way out: several countries, including India and Sri Lanka, require proof of vaccination from travellers arriving from Brazil, which the World Health Organization lists as a risk country. Check your onward and home country before you fly, because you cannot fix it at the airport. Under the International Health Regulations the certificate is valid for life.
No, provided you stay inside the international transit area and do not clear immigration. If you have to enter Brazil to re-check bags or because you are on separate tickets, normal entry rules apply and you need whatever your nationality needs. Allow a generous connection at Sao Paulo Guarulhos if you have to clear and re-check.
No. Brazil states that issuing a visa is a discretionary act of a sovereign state, and that a visa is not a right to enter but an expectation of being admitted. No agency is the Embassy. What good preparation does is make sure the file is complete, the purpose is stated accurately and the evidence supports it.