by UNI-Prep Institute · Updated September. 20, 2026
Many people dream of teaching English abroad with a TEFL or TESOL certificate. But when it comes to the visa application or the school's recruitment process, many run into a major obstacle. A degree certificate, police clearance, or TEFL certificate without legalization or apostille is not accepted.
If you run into this hassle at the last minute, your visa gets delayed, and you might even miss your joining date. So in this guide, we'll explain in simple terms:
What's the difference between apostille and legalization?
How do you know which one applies to your case?
Which documents need to be attested?
How much cost and time can it take?
And what common mistakes should you avoid so your entire process goes smoothly?
If you're a TEFL teacher, or preparing to teach English abroad, I hope today's article will be extremely helpful for you.
What's the Difference Between Apostille and Legalization?
As a TEFL teacher, when you look for a job internationally, you'll need to legally prove that 3 main documents are authentic:
TEFL certificate (e.g., a 120-hour online or in-class course)
University degree or Honours/Master's certificate
Police Clearance Certificate (Criminal Background Check)
Here's the matter broken down in detail:
What Is an Apostille?
An Apostille is a global or international certification. An agreement known as the Hague Apostille Convention has been concluded among approximately 130 countries. In this agreement, the countries essentially say: "If our own country's central government department stamps a document with a specific stamp (Apostille Sticker), the other countries will accept that document as authentic without question." In other words, the destination country's embassy has no role here.
What Is Document Legalization?
Legalization is a specific country's official seal/attestation process. Countries that are not part of this convention do not directly trust another country's official stamp. They say: "After your country's Ministry of Education or Ministry of Foreign Affairs attests it, that document must be sent to our own embassy. Only once our consular officer reviews it and provides a signature and seal (Embassy Attestation) will it become valid in our country."
When Do TEFL Teachers Need Which One?
Whether you need an apostille or a legalization depends entirely on whether both the country that issued your certificate and your destination country are members of the 1961 Hague Convention.
1. When Do You Need an Apostille?
When both the certificate-issuing country and the destination country are members of the Hague Convention, an apostille alone is enough.
For example, suppose you completed a TESOL & TEFL Diploma from our Uni-Prep Institute and you're going to teach in South Korea or Vietnam. In this case, you only need to get an Apostille stamp or certificate attached to the document from the relevant U.S. government department. There's no need to visit the destination country's embassy, because both countries are Hague members.
2. When Do You Need Legalization?
When either your destination country or your certificate-issuing country is not a member of the Hague Convention, an apostille won't work. You will be required to go through full legalization .
For example, suppose your TEFL certificate is from the UK, but you're going to teach in Thailand, Taiwan, or Dubai. Or your certificate is from a country that isn't part of the Hague Convention. In that case, you first need to have the document authenticated by the Ministry of Education or Ministry of Foreign Affairs of the certificate-issuing country. Then that document must be submitted to the destination country's local embassy to obtain Legalization. An up-to-date list of Hague Convention member countries can be found on the official website of the Hague Conference on Private International Law (HCCH) .
Which Documents Do TEFL Teachers Need to Legalize / Apostille?
To get a work permit or employment visa as an English teacher (TEFL Teacher) abroad, generally 3 main documents need to be apostilled or legalized.
Below is a detailed list of the required documents, according to the immigration and education ministry rules of the destination country (e.g., China, South Korea, Vietnam, or Thailand):
1. Primary Documents (Mandatory)
A) TEFL / TESOL / CELTA Certificate: This is proof of your professional qualification to teach English. Whether you completed the course online or offline, the certificate must be legally valid. The Apostille/Legalization for the TEFL certificate must be done from the exact country where it was issued.
B) Highest Educational Qualification Certificate: In most countries, having at least a bachelor's or undergraduate degree is mandatory for a valid teaching visa. In this case, your original certificate or degree certificate must be attested by the Ministry of Education and Ministry of Foreign Affairs (or the Apostille board) of the country where the university that issued it is located.
C) Police Clearance Certificate: Since as a teacher you'll be teaching children or adults, the destination country's government strictly checks whether you have any criminal record. This is usually issued from your home country. This certificate typically has a validity of 3 to 6 months. So it should be apostilled or legalized right before submission to immigration.
2. Additional Documents (May Be Required Depending on the Country)
Some specific countries or schools may ask for the following documents in apostilled or legalized form, in addition to the three above:
A) Academic Transcripts: Along with the original degree, your honours mark sheet or transcript is also sometimes required to be attested (for example, for certain university positions in South Korea).
B) Medical Fitness Certificate: An official report on your physical and mental fitness. This is usually checked at a local hospital after you arrive in the destination country, but some countries ask you to have it attested in your own country before you go.
C) Work Experience Certificate: If you've taught English somewhere before and are claiming extra salary or rank because of that experience, the experience certificate from the previous school may need to be notarized and attested.
Keep in mind: which documents are required can vary depending on the school or employer and the immigration policy of the destination country. So as soon as you receive the offer letter, it's a good idea to ask the employer for a specific list.
How Much Does Legalization & Apostille Cost, and How Long Does It Take?
The fee and processing time for each step vary depending on the type of document, the ministry, and the embassy, and change from time to time. For example:
1. Apostille Cost and Time
Since apostille is a single-step process, both the cost and the time are lower. Processing time is usually 3 to 10 business days. However, in countries like the US or UK, some authorized agencies or counters allow you to get it done in person in 24 to 48 hours.
The Official Government Fee is $10 to $60 per document. For example, in the UK (FCDO), the government fee is £45 per document (around $60), while in the United States (US Department of State), it's only $10 to $20 depending on the state. However, if you use an international agency remotely, they may charge $100 to $250 per document including notary, courier, and processing.
2. Legalization / Embassy Attestation Cost and Time
Legalization is a multi-tier process. It has to pass through 3 places: the local notary, the country's Ministry of Foreign Affairs, and the destination country's embassy. So the cost and time are much higher. Processing time averages 3 to 6 weeks. The process takes this long because of getting an appointment at the destination country's embassy and backlogs in their consular section.
The Ministry Authentication Fee is usually $20 to $50 per document. The Embassy Consular Fee depends entirely on which country's embassy you're submitting to. Embassies charge $40 to $150 per document depending on the country. Fees for Middle Eastern country embassies or the Chinese embassy tend to be a bit higher.
Since the process is complex, teachers usually get help from an agency. Including all the steps and international courier costs, legalization can end up costing $200 to $500 total per document.
4 Common Mistakes TEFL Teachers Should Avoid
Even a small mistake while getting documents apostilled or legalized can lead to visa rejection, extra expenses, and months of wasted time for TEFL teachers. Here are the details of 5 common mistakes you should avoid as an international teacher going through this process:
1. Trying to Apostille or Legalize in the Wrong Country
Many teachers think they can get their TEFL certificate apostilled from the government office of the country they currently live in, or the country where they got the job. But the correct rule is: attestation must always be done in the exact country where the document was issued. If you took an online TEFL course from a UK institution, that certificate must be apostilled through the UK government body ( FCDO ), and nowhere else.
2. Not Paying Attention to the Validity of the Police Clearance
Many teachers get their police clearance certificate and have it apostilled right at the start of their job search, or before their interview. But almost every country's immigration department won't accept a police clearance older than 3 to 6 months. Apostille or legalization can also take several weeks. So it should be issued and attested at the very last moment, after calculating the timing, once you have the offer letter.
3. Not Checking Original Certificate vs. Photocopy Requirements
Another common mistake is putting the apostille stamp directly on the original degree certificate, or sending a plain printout of an online TEFL certificate for apostille without having it notarized first.
For an online TEFL certificate, it usually first needs to be certified as a True Copy of the Original by a registered solicitor or notary public, and only then can the government stamp be obtained. Some countries want the apostille on the original degree certificate, while others accept an apostille on a notarized photocopy. It's important to confirm this in advance with the school's HR.
4. Falling Into the Trap of Third-Party or Fake Agencies
Sending your passport or original certificate to any third-party agency that claims, after a quick Google search, to do the work cheaply is another mistake, made to avoid international courier hassles and process complications. If the documents turn out to be fraudulent, you could be permanently blacklisted from that country. So you should always use a well-known, UK- or US-government-approved document processing agency that works directly with government offices.
Important Tip: Ask your school's hiring officer (HR) or immigration agent for a Document Checklist. It should clearly state whether they want the Original or a Notarized Copy, and whether it needs to be Apostilled or Embassy Legalized.
Important Tips for TEFL Teachers
The process of getting certificates and documents apostilled or legalized for TEFL teachers is quite complex and time-consuming. A small mistake can mean having to start the entire process over again. Below are 6 extremely important and practical tips to make this whole journey easy, affordable, and mistake-free:
1. Start Working Out Your 'Timeline'
With a few exceptions, document legalization or apostille can take an average of 3 days to 6 weeks. So start the attestation process as soon as you have your Job Offer Letter in hand. Before booking your flight ticket for the visa, make sure all your documents have actually arrived.
2. Get a Checklist from the Employer (School HR) as the First Step
Rules vary by country, and even by province or school within the same country. For example, some schools want the apostille on the original certificate, while others are fine with a notarized photocopy. So before starting the process, ask the school's HR for a specific Document Requirements Checklist.
3. Make Sure Spellings and Names Match Exactly
Your name's spelling on your passport, bachelor's degree, and TEFL certificate should be 100% identical. If even one letter differs on any certificate, or if a middle name is missing, the immigration department will reject it. If there's any mismatch, get it corrected in advance with an affidavit or amendment.
4. Do All Documents as One Package
If you're using the help of an international document agency, don't send documents one at a time at different times. Send all documents together in one package. This can reduce your international courier costs and the agency's service fee by about 30% to 40%.
5. Get Help from an Approved Translator
If your degree or police clearance is in a regional language, it needs to be translated into English or the destination country's language by a government-approved translator before apostille or legalization. The translated copy must be attached to the original before it can be attested.
6. Check for Digital or e-Apostille
The UK and some US states now offer e-Apostille or digital apostille service. This is faster and cheaper than a paper apostille. However, confirm with the school authority in advance whether your destination country's immigration accepts a digital apostille.
Conclusion
As a TEFL teacher trying to fulfill your dream of teaching abroad, documenting apostille or legalization may seem complicated at first, but once you know the correct rules, it's actually a simple task. Three things are important to keep in mind: 1) whether your certificate-issuing country and destination country are members of the Hague Convention, 2) whether you've gotten a specific Document Checklist from the school's HR, and 3) whether you've started the process with the timeline in mind as soon as you got the offer letter.
Most mistakes happen around things like the validity period of the police clearance, matching name spellings, and choosing a reliable agency. So preparing in advance greatly reduces the risk of visa delays or missing your joining date.
Stay with Uni-Prep for this kind of TEFL career guide and resources. If you haven't gotten your TEFL/TESOL certificate yet, enroll in Uni-Prep's accredited TESOL & TEFL course and start your international teaching journey today.