[Internal Training Materials] Best Free Text-to-Speech Software for E-learning
July 22, 2026
Opportunities for creating slides using PowerPoint and making videos for seminars are increasing for internal training purposes.
Among these, situations where people "want to add narration to slides and videos" are also increasing. Recently, narration is also frequently added to presentations.
However,
- It's embarrassing to use my own natural voice
- I was turned down by others
- It's not worth hiring a voice actor
- Budget-wise, I can't hire a voice actor
There are endless concerns when it comes to adding narration.
In such cases, text-to-speech services and speech synthesis software are recommended.
What is text-to-speech software?
It is software that converts documents such as text and characters into audio and reads them aloud.
This blog introduces free-to-use speech synthesis software recommended for creating internal training materials and e-learning content.
Recommended speech synthesis software for narration
Recently, with advances in AI technology, many amazing speech synthesis software have appeared in the world.
But when it comes to "Can I use it for work?", the terms of service can be complicated or the price can be expensive, often preventing people from using them.
That's why we recommend 『Ondoku』!
Ondoku is
- Creating internal training materials
- e-learning materials
- Ease of use in PowerPoint
- Ease of use within the company
- Ease of operation for creating audio
Comparing with other speech synthesis software, it is outstandingly easy to use in any situation.
In fact, it is already being used in many internal training materials, presentations, and e-learning.
It is also popular for conference presentations.
Reasons why Ondoku is recommended for internal training materials and e-learning
When trying to use text-to-speech services or speech synthesis software for work, various restrictions are often added as "commercial use."
Also, for commercial use, you might need to purchase a separate license...
But with Ondoku, there is no such concern.
Ondoku can be used for narration of internal training materials even for free.
Specifically
Available for free (credit notation required)
- Use in internal training and video manuals.
- Use on corporate websites, SNS accounts managed by corporations, etc.
- Use Ondoku audio in lectures and research presentations.
Example: Giving a lecture using Ondoku
Available with the purchase of a paid plan (Business Plan)
- Distribution and sale of downloadable content using Ondoku audio.
Example: Distribution or sales on Podcast, Voicy, etc. - Sale of educational materials using Ondoku audio.
Example: Selling cram school teaching materials
In this way, it is clearly stated that commercial and corporate use is possible.
Please also see this article for more details.
What you can do with Ondoku. About commercial use (business use) and prohibited acts.
Commercial use (business use) is possible with Ondoku. Regardless of individuals or corporations, use for the purpose of gaining monetary or other benefits directly or indirectly is commercial use. However, please note that prohibited acts are established in Ondoku. This time, what you can and cannot do with Ondoku...
There is also a great benefit for corporations: up to 10 terminals can be used with a single account.
"Is this usage okay?" "I want something that can be used easily and for free."
It is a text-to-speech service that fulfills such requests.
Of course, audio can also be embedded into PowerPoint. Please refer to the blog below for details.
Let's put audio files into slides and presentations like PowerPoint. Recommended software and how to insert it
In slides such as PowerPoint, by adding audio in addition to illustrations and photos, you can make your presentation easier to understand. We will introduce how to input audio using text-to-speech software to make your slides attractive, as well as recommended software...
Reputation of Ondoku in internal training, presentations, and e-learning
Ondoku has received many reviews from people who have actually used it in-house or for work.
Here are some of our customers' voices.
I think it's a very easy-to-use and good service.
I used it for a presentation. Since the presentation is finished for now, I will cancel. It's a very good software, and I would like to use it again.
I am satisfied with the quality, which is highly cost-effective.
Regarding the script reading, most of the opinions from the audience were favorable.
I would definitely like to use it again for the next creation. As feedback, I thought it would be an even better service if intonation adjustment could be done in more detail.
I used it in an internal presentation, and it was highly acclaimed by the audience.
I thought it was a very easy-to-use and good service. Occasionally there were strange readings, but overall it was good lol. Also, if there were natural intonation and inflection, it would be perfect.
The price and functions were very appreciated.
Because new material creation is finished. It was very easy to use. Thank you very much. I will use it with proper credit included!
Let's try Ondoku right now
Ondoku allows you to create audio for free even without registering as a member.
You can immediately solve concerns such as what kind of reading it can do and whether you can create narration at the level you are looking for.
For Japanese, you can choose narration from the voices of 8 people. It also supports foreign languages such as English. You can create narration with native pronunciation.
There are also blog articles and YouTube videos for trial listening, so please check them out!
Try listening to 16 types of voices from the text-to-speech software Ondoku for free. Change the impression with pitch changes
Ondoku has 16 types of Japanese voices. Of course, both male and female voices are available. We have made it possible for you to listen to 8 commonly used Japanese voices and the voices when the pitch of each is adjusted.
Why don't you also use Ondoku for internal training, presentations, and e-learning?
■ AI voice synthesis software "Ondoku"
"Ondoku" is an online text-to-speech tool that can be used with no initial costs.
- Supports approximately 50 languages, including Japanese, English, Chinese, Korean, Spanish, French, and German
- Available from both PC and smartphone
- Suitable for business, education, entertainment, etc.
- No installation required, can be used immediately from your browser
- Supports reading from images
To use it, simply enter text or upload a file on the site. A natural-sounding audio file will be generated within seconds. You can use voice synthesis up to 5,000 characters for free, so please give it a try.
Email: ondoku3.com@gmail.com
"Ondoku" is a Text-to-Speech service that anyone can use for free without installation. If you register for free, you can get up to 5000 characters for free each month. Register now for free
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