OnTESOL offers a wide variety of certifications to train their students on how to teach English as a foreign language. Learn more about OnTESOL online TESOL courses below.



Default avatar
Yes, I recommend this program

120 Hour OnTesol

I don't have a teaching background and the course was able to set a foundation, from the onset, to ensure that as a student, I was learning all aspects of the teaching experience. Apart from the curriculum, the covers multi-dimensional factors that could impact a teacher such as learner experience, teaching strategies and different approaches on engaging and eliciting feedback, managing difficult situations etc. The course also provides brilliant support from their administrative team, through assisting students to prepare for job opportunities and in particular preparing for practicums. The tutors are exceptional, very professional and extremely insightful. The team is very approachable and truly demonstrate their support and interest in ensuring students are successful.

  • Course material is very organized, plenty of support with exception tutors, additional 10 hour training sessions with other students.
  • Sufficient time to complete the course material which includes a significant amount of reference material.
  • Timely feedback and turnaround time on assignments (usually within 24 hours and never beyond 48 hours.
  • I haven't experienced any issues at this point.
Default avatar
Yes, I recommend this program

ONTESOL 250-Hour TESOL Diploma

The ONTESOL 250-Hour Diploma was a comprehensive program that well prepared me to meet the demands of serving as an ELT instructor and in working in the field of TESOL. I enjoyed the content related to pronunciation and teaching methodology. I appreciated the assignments within the course as they mirrored real-world tasks and skill development. The course provided a lot of practical information that I continue to reference in my daily career. If you are looking for a comprehensive course with practical training elements, I would recommend the 250-HOUR TESOL diploma.

  • Comprehensive Topics
  • Different Types of Methodology
  • Pronunciation Teaching
  • Visually Non-Stimulating Material
  • Dense
Default avatar
Yes, I recommend this program

120 hr Advanced TESOL certificate

It was a delightful experience. I enjoyed refreshing my memory with what the course had to offer. The material given was wide scoped and included different media from videos to tutorials to charts. Some of the content had some typo mistakes that could be avoided. The assistance of the tutor was greatly appreciated. The tutor gave target and vivid feedback on each assignment provided. Assignments were well prepared and targeted the course objectives. All in all it was a very helpful course since it was self-paced for someone who is working.

  • Self pace
  • Constructive feedback
Default avatar
Yes, I recommend this program


I did the 250-hour TESOL Diploma, and 20- hour Specialist certificate courses (Teaching Young Learners, Business English, and Teaching IELTS). Margaret was my tutor for the Diploma course. She is highly experienced. She gave detailed explanations to questions, and provided constructive feedback. Talking about the course material, I think anyone can understand it. It was easy and concise.
For the Specialist courses, James was my tutor. He’s experienced and also responded to queries promptly. I think Teaching IELTS remains the best. It covered all aspects of the IELTS Exam preparations, and has wonderful tips that can help any student to succeed.
I must say that it is worth it for anyone aspiring to be a good ESL teacher to go for any of the OnTESOL courses. They are carefully designed to meet different needs with regards to teaching. Above all, you are going to meet wonderful people that would help you succeed. I remembered when I couldn’t meet up with the deadline due to accident that I had, Sebastian and others were there to help. I have already gotten my diploma and certificates but they are still willing to help with job search.
In general, I recommend Ontesol to anyone who wants to be a wonderful ESL teacher.

Default avatar
Yes, I recommend this program

120-Hour OnTESOL Certificate

The course was motivating in content as there was a variety of topics such as second language learning and acquisition, teaching strategies and methodologies, classroom management techniques, ideas on incorporating culture into lessons, etc. The grammar and phonology sections were also comprehensive. In particular, the feedback from the online mentor was detailed and helpful with many suggestions and ideas for improvement of PPP lessons.

One thought is to extend the grammar test at the end of the section so that there are 50 questions or so, instead of 35. Also, more practice with creating PPP lessons for different levels would be especially useful for new teachers of ESL.


Displaying 1 - 3 of 3

Staff Interviews

These are in-depth Q&A sessions with program leaders.

Claudia Bertotto

Job Title
Co-founder and Director of Studies
Claudia Bertotto is co-founder and Director of Studies at Coventry House International and OnTESOL. Claudia has close to 40 years of experience in the English Language Teaching industry and 20 years of experience as a curriculum designer for in-class and online TESOL courses that have received accreditation from top international organizations, including Trinity College London and TESL Canada. Ms. Bertotto completed her Master’s degree in TESOL and the Trinity DipTESOL, among other prominent TESOL-related credentials.
Claudia B. in Egypt

What is your favourite travel memory?

I had the opportunity to live in different countries and travel a lot in my career. I received my first TESOL credential in 1989 when I went to London, UK, for the first time. Since then, I have had the opportunity to travel worldwide as an English teacher, teacher trainer, and school director. The countries that I enjoyed touring the most were Egypt, Israel, India, Greece, and Turkey. I love learning about cultures and civilizations with a mix of ancient monuments, picturesque landscapes, and a rich history that spans thousands of years.

How have you changed/grown since working for your current company?

I started with Coventry House International in 2001 when the language school industry in Canada was starting to emerge, and it became apparent that there was a need for higher teacher training standards. So we started offering in-class courses for TESL Canada accreditation, which became the first Trinity CertTESOL course in North America. We launched OnTESOL in 2003 by adapting Coventry’s in-class courses to the online format with a 200-hour course, which was the first online course to be recognized by TESL Canada. A lot has changed in these past 20 years. The 200-hour course was eventually adapted into a 120-hour course for TESL Canada Standard 1 accreditation and a 250-hour course for TESL Canada Standard 2 accreditation. Over time, technology has given us the tools to analyze data and develop materials to improve the experience for trainees. Some examples are the new FAQs Video Tutorials for key sections where we noticed trainees need the most support from their tutors, the new Lab Videos for extra support with lesson planning assignments, and the new Live Workshops to provide an interactive learning experience. Supervising and training a greater number of tutors was probably the biggest challenge in the beginning. Online education was new, the internet was completely different, and everyone (including me) had to learn a completely new set of skills. I am very happy to have had the opportunity to collaborate with amazing teacher trainers. Many tutors who started 20 years ago are still with us today.

What is the best story you've heard from a return student?

The most rewarding feeling is when a graduate tells us how all their work in the TESOL course made a difference. I feel accomplished when they say they qualified for a competitive job because they could write an outstanding lesson plan in their interview, get a promotion, or open their own school.

Which course would you recommend?

The 250-hour TESOL Diploma is probably one of the most comprehensive TESOL, TEFL, CELTA courses globally. However, I only recommend this program to those who have previous ELT teaching experience, are highly interested in the field of TESOL, and can dedicate the time needed to complete all assignments. The Advanced 120-hour TESOL Certificate course is sufficient for teaching positions in Canada, online, or internationally. This course includes 3 lesson plan lab assignments where trainees complete detailed lesson plans using different
Communicative Language Teaching (CLT) formats to be ready to teach any language skill in an integrated, meaningful, and authentic way. Most students combine a 20-hour specialist on Teaching English (TEO) Online, Teaching English to Young Learners (TEYL), or Teaching Business English (TBE) to add extra training on task-based learning and other teaching methods related to specific classroom situations. Currently, the most popular choices are the 120-hour TESOL certificate with a 20-hour specialist option on Teaching Young Learners or Teaching Business English. This combination offers a comprehensive practical experience with the most commonly used CLT lesson planning formats: PPP, ESA, and TBL.

What makes your company unique? When were you especially proud of your team?

The level of training in lesson planning is what makes OnTESOL unique. TESOL courses should offer technical skills so graduates can adapt to any classroom situation and supplement or replace the textbook with effective methods and materials. With OnTESOL, trainees get to complete detailed lesson plans --anywhere between 3 and 7 and receive feedback from a qualified tutor. OnTESOL also offers the option for graduates of our online TESOL courses to complete a separate Practicum module, where they have to observe and teach classes with real ESL students.

What do you believe to be the biggest factor in being a successful company?

Maintaining the same standards of Coventry’s in-class courses and focusing on the quality of lesson plans and tutor feedback has been the biggest factor for our success with OnTESOL. The assignments in the course are challenging, but they have long- lasting effects on a teacher’s career as well as the learning experience of their students.