How to credit Ondoku: Examples and points to note.
Jan. 26, 2026
Hello, thank you for always using Ondoku.
At Ondoku, you can use the text-to-speech service for free.
It supports not only personal use, but also corporate and commercial use.
As specific usage examples,
- Narration audio for YouTube
- Movie contests
- English listening tests
- In-house training videos
- Audio for training foreign nationals
- Operation guides for machines
Ondoku is chosen in many situations like these.


A paid plan is required for use in cases where credit cannot be displayed (such as voice guidance).
For subcontracted or outsourced work, a business plan is required regardless of whether credit is displayed.
How to credit Ondoku
Please credit Ondoku as follows.
- Example 1: The audio in this video uses Ondoku.
- Example 2: Narration Ondoku
- Example 3: ©Ondoku
- Example 4: Voice: Ondoku
- Example 5: ©ondoku3.com
- Example 6: Created By ondoku3.com
- Example 7: Voice By ondoku3.com
If you create audio with Ondoku for your own enjoyment and do not publish it externally, credit notation is not required.
In the case of YouTube, please display it in the description box or by embedding it within the video.
*When embedding YouTube videos on a homepage or corporate website, if there is no credit notation within the video,
please display the credit not only in the description box but also on the website or above/below the video embedded on the corporate website.
When embedding in a video, please display it in a general size. Notations at a speed or size that is difficult for the human eye to see are not permitted.
When using it in slides, please provide credit notation on the title slide, slides where audio is played, or the final summary slide.
When embedding in games or apps, please provide credit notation so that users can understand "this is the voice of Ondoku" when the audio is used.
For school listening tests and school broadcasts, the method of credit notation is different. Please check here.
No matter the usage scenario:
- Locations that do not catch the user's eye
- Credit notation that is too small or too fast for the user to understand
is not permitted.
- Voice guidance
- Telephone response
- Use in IVR equipment (in-house)
- Disaster prevention drills
- Apps that cannot display credit due to specifications
For audio use in situations where credit cannot be displayed, please be sure to subscribe to a paid plan.
Also, please continue to subscribe to a paid plan for the duration of the audio use.
A business plan contract is required if credit cannot be displayed or for methods available only with a business plan. For details, please check "Detailed information on the business plan."
When using Ondoku, please be sure to read the Terms of Service and follow the rules.
What is credit notation?
Credit notation means displaying the name of the author, the title of the work, etc.
Please provide notation so that anyone looking at the audio created with Ondoku can clearly understand that "this was created with Ondoku."

Ondoku is a service that can be used commercially for free, but
When using Ondoku for free, we ask that customers always provide credit notation.
By having credit displayed, we hope many people will learn about the existence of Ondoku.
Using it for free without credit notation is a violation of the Terms of Service.
Please note that if you violate the Terms of Service, we will take actions such as suspending your use of Ondoku, freezing your account, stopping the use of audio, and in malicious cases, legal action.
Ondoku continues its service supported by many users.
Ondoku's service will evolve further by receiving requests and desires for how you want things to be.
Ondoku will continue to move forward into the future.
Thank you for your continued support so that we can continue the service in the future.
■ 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