If you get an error in Ondoku and don't know what to do

June 27, 2023

If you get an error in Ondoku and don't know what to do

When using Ondoku, sometimes an error occurs and it doesn't read aloud.

An error may occur depending on the network environment or browser used .

Even with the same sentence, it may be possible to read it normally if you wait a little while and read it again .

However, once an error occurs, the sentence you want to read may not be read out well and an error may occur many times .

What caused the error? Error handling by type

There are two main reasons for the error

  1. If you have problems with the text to read
  2. If there is a problem with the usage environment

Let's take a closer look at each solution.

1. If you have problems with the text to read

Recommended number of characters

Ondoku has a recommended number of characters, and if you read more than that number of characters, reading errors are likely to occur.

  • Normal time: 5000 characters
  • When using SSML: 3000 characters

is the recommended number of characters.

text causes error

  • Too long (more than the recommended number of characters)
  • contains the symbol
  • SSML is wrong

That's a big cause of reading errors. I'll show you how to deal with each.

What to do when you want to read long sentences

  • Read long sentences in multiple times, such as 2 or 3 times.
  • Put it in multiple text boxes and read it aloud using the conversation function

This makes it difficult for errors to occur.

Related article >> How to use the conversation function

What to do when reading text that contains symbols

Ondoku is a service that can read out characters .

If extra symbols are included, it may interfere with reading and may not be read aloud.

For example: & < > : ; " = etc.

In particular, symbols used in SSML tags are error prone. Symbols that are not related to reading should be removed as much as possible.

If you want the symbols to be read aloud, please take measures such as replacing the symbols with katakana or hiragana.

Example: = equal

2. What to do if there is a problem with the usage environment

Ondoku Recommended Internet Speed

  • Download: 5Mbps

You may not be able to use comfortably if the Internet speed is below the recommended speed.

You can check your current internet speed here.

External Site: Internet Speed Speed Test

Recommended browsers for Ondoku

Ondoku recommends the latest version of Google Chrome as the recommended browser .

The usage environment is the cause of the error

  • slow internet speed
  • JavaScript is disabled in your browser
  • Not using the recommended browser
  • Browser extensions are interfering
  • Some kind of blocking function is working
  • There is some cause in the usage environment

That's a big cause of reading errors. I'll show you how to deal with each.

What to do when internet speed is slow

When internet speed is slow

  • Connect to WIFI or mobile networks with fast internet speeds

Please use it.

Also, try tethering.

What to do when JavaScript is disabled in your browser

If JavaScript is disabled, it cannot be read aloud.

Please enable JavaScript.

Click here to check if JavaScript is enabled in your browser.

External site: How to enable JavaScript

What to do when you are not using the recommended browser

If you do not use the recommended browser, it will cause some kind of error.

Please use the recommended browser.

What to do when an error occurs even with the recommended browser

If you are having trouble with an error

  • Change your browser to Chrome (but if you're using Chrome right now, try a different browser)
  • Try Chrome's incognito window

try it.

download google chrome

How to open an incognito window

What is an incognito window

You can browse without saving the browsing history of the website and the information entered in the form.
You can disable cookies, cache and extensions.

how to use incognito window

  1. Click "File" on the toolbar
  2. Select Open incognito window


  1. Recall with [Ctrl] + [Shift] + [N] keys

can be launched with

Please try it once.

Running in an incognito window means cookies, cache, and extensions are getting in the way.

  • Delete cookies and cache
  • Disable extension

Then try Ondoku.

What to do when some kind of blocking function is working

In the past, there was a case where "When I tried to read aloud on a computer at work, the HTML collapsed and I couldn't read it aloud."

The cause at this time was the firewall installed in the network environment at work.

I had the information department check it, and after that, I received a report that I was able to use it.

Please check if there is any blocking function in your network environment.

Try from another device (smartphone, tablet, PC)

If there is a problem with the usage environment and a reading error occurs even with the recommended environment, changing the terminal may solve the problem.

Please try using a different device from the one you were using before.


I couldn't read it on my computer → Try it on my smartphone in a mobile data communication environment → Try it on my colleague's computer → Try it on my tablet at home

You can often solve the problem by trying from a different device (smartphone, tablet, or computer).

Please try again.

Contact Ondoku about the error

Contacting Ondoku will lead to an investigation into the cause of the error.

On the Ondoku management side, you can check the history of "Error occurred in this situation" called error log.

The error log is also invisible to the customer.

If you want to investigate the cause of the error, please contact Ondoku customer support from inquiry .

Ondoku customer support will respond within 24 hours on business days.

  • If you are a non-member, we cannot investigate the cause of the error. Please register as a member.
  • If you are a member, we will support you by e-mail in order to investigate the cause of the error.

When contacting us

  • Accounts affected this time:
  • Your browser:
  • What time did it occur:
  • language:
  • Audio type:
  • Settings such as speed:
  • I tried incognito window
  • I tried from another terminal (smartphone, tablet, PC)
  • Are you still getting the same error now:
  • The sentence in error (the full text you tried to read):

Please contact us with that in mind.

By providing us with the above information, we can quickly identify the cause of the error and resolve it.

By investigating the cause of the error, you can use Ondoku more comfortably.

At Ondoku, we are more than happy to help you.

Please take this opportunity to contact Ondoku customer support.

I will do my best to support you.

May it continue to be the best text-to-speech software for you.

Thank you for your continued support of Ondoku.

■ 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.

Text-to-speech software "Ondoku" can read out 5000 characters every month with AI voice for free. You can easily download MP3s and commercial use is also possible. If you sign up for free, you can convert up to 5,000 characters per month for free from text to speech. Try Ondoku now.
HP: ondoku3.com
Email: ondoku3.com@gmail.com
Related posts

"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