[2026 Latest] 10 Best Text-to-Speech Software! Includes Free Tools for Commercial Use

What kinds of text-to-speech software and services are available?

In this article, we will carefully select, compare, and introduce recommended text-to-speech software and services!

Text-to-speech software that converts text into audio can be utilized in various situations, such as video production, language study, and improving accessibility.

In particular, free-to-use software has significant advantages in terms of cost.

Furthermore, the number of options for high-quality text-to-speech services that can be used for commercial use is increasing.

This time, we will explain the characteristics and usability of each in detail, from browser-based types that require no installation to high-performance desktop types.

We will also introduce many free software options that can be used for commercial use.

By reading this article, you will surely find the most suitable text-to-speech software for you.

[Free] Recommended AI Text-to-Speech Software You Can Use Right Away

For those looking for text-to-speech software, we recommend "Ondoku".

"Ondoku" is an AI text-to-speech software (web service) that can be used for free from a browser.

It can be used immediately with no installation required and simple operation.

Surprisingly, "Ondoku" allows you to read up to 5,000 characters for free!

Moreover, commercial use is also OK for free (credit notation is required for free use).

If you need text-to-speech, why not try "Ondoku" for free first?

What is Text-to-Speech Software? Basics and How to Choose from Free to Paid

First, we will briefly explain the basic knowledge of text-to-speech software!

Basics and Types of Text-to-Speech Software

Text-to-speech software refers to software that converts text into audio.

Text-to-speech technology is evolving rapidly; voices that were once mechanical can now be read with natural intonation and pronunciation due to the development of AI technology.

There are mainly two types of text-to-speech software: "browser-based" and "desktop-based."

The feature of the browser-based type is that it can be used from a web browser without installation.

It can perform high-quality reading by utilizing AI engines in the cloud.

The desktop-based type is installed and used on a computer, with the advantage of being usable in offline environments.

Some are also released as free software.

Additionally, some installation-type paid software features attractive characters.

Which is Recommended: Browser-based or Desktop-based?

So, which is better: browser-based software or desktop-based software?

Browser-based text-to-speech software has the major advantage of being usable immediately without installation.

Browser-based services like "Ondoku" can perform high-quality reading because they can use the latest AI speech synthesis engines regardless of PC performance.

Furthermore, since regular updates are performed automatically, you can always use the latest features.

On the other hand, desktop-based text-to-speech software has the advantage of being usable even in environments without an internet connection.

Another feature is that there are specialized software for specific purposes, such as reading comments for video streaming.

There are high-performance free software options, but they may take time to install and configure.

Browser-based is recommended for beginners, those who want to use it easily, or those who want high-quality audio. Desktop-based is recommended for those who prioritize offline use, want to use it for streaming comment reading, or want to use character voices.

What are the Differences Between Free and Paid? It is Recommended to Check Commercial Use

There are differences between free and paid versions of text-to-speech software in terms of functional limitations, audio quality, and whether commercial use is permitted.

While basic reading functions are available in free software, character limits and advanced adjustment functions may be restricted.

Regarding commercial use, some software permits it even in the free version, while others do not.

For example, "Ondoku" allows commercial use even in the free version by providing credit notation.

Paid text-to-speech software offers benefits such as more diverse voices, more detailed adjustment functions, and the ability to use it for commercial purposes without credit notation.

If you want to use it for free, it is important to first carefully check the software's terms of use and understand the conditions for commercial use.

What are the Points to Consider When Choosing Text-to-Speech Software?

When choosing text-to-speech software for the first time, it is important to first clarify your intended use.

The optimal software varies depending on the purpose, such as creating video narration, language learning, or improving accessibility.

Of course, ease of use is also important.

You can use a text-to-speech software with an intuitive interface longer than one with complex functions.

The naturalness of the audio is also an important point, especially if you need natural Japanese intonation and pronunciation; in that case, it is better to choose software specialized for Japanese.

If you want to use it for free, it is also important to check the details of the functional limitations and ensure they do not affect your intended use.

If you are considering commercial use, you need to choose free software that allows commercial use.

[Free Options Included] 10 Recommended Text-to-Speech Software

Now, let's introduce in detail which specific text-to-speech software is recommended!

1. Ondoku
2. A.I.VOICE
3. CeVIO AI
4. VOICEPEAK
5. SofTalk
6. Bouyomi-chan
7. VOICEVOX
8. CoeFont
9. COEIROINK
10. Yukumo!

1. Ondoku | High-Quality Audio Service Available Immediately via Browser for Free

"Ondoku" is a text-to-speech service that can be used immediately from a browser without installation.

It can be used right now not only on PCs but also on iPhone/iPad (iOS) and Android smartphones!

Its feature is natural audio utilizing the latest AI technology.

There is a rich variety of voices; for example, you can choose from 16 types of voices in Japanese.

It is a free-to-use reading service, but another feature is that commercial use is OK, such as for monetizing videos or for company use.

What you can do with Ondoku. Commercial use (business use) and prohibited items.

Commercial use (business use) is possible with Ondoku. Any use for the purpose of obtaining direct or indirect profit, such as money, regardless of whether you are an individual or a corporation, is commercial use. However, please note that prohibited acts are established in Ondoku. This time, what you can and cannot do with Ondoku...

Since you can read up to 1,000 characters without registration and up to 5,000 characters after registration for free, it can handle long narration creation for free.

Operation is also very simple: just enter the text and press the "Read" button.

Even first-time users can operate it intuitively.

Furthermore, because it supports over 80 languages and dialects, including English, it is also useful for creating foreign language content.

Although it is a free web service, it can read with the highest quality audio, so it is also recommended for your first AI reading experience.

Of course, it is also ideal for professional narration purposes.

If you are unsure about text-to-speech software, why not experience "Ondoku" first?

2. A.I.VOICE | Japanese-Specialized Speech Synthesis Software with High-Quality AI Voice

A.I.VOICE is high-quality speech synthesis software developed by AI Inc.

It uses a speech synthesis engine called "AITalk," which can generate very natural Japanese audio.

The lineup includes many attractive character voices, such as "Yuzuki Yukari" and "Kotonoha Akane/Aoi," which are famous as "VOICEROID" characters.

It is compatible with both Windows and Mac and is sold as paid software.

The emotional expression of the voice is rich, and because you can finely adjust the intensity, pitch, and speed of the reading emotion, more natural conversation-style reading is possible.

Editing functions for intonation and reading are also extensive, allowing specialized terms and proper nouns to be read accurately.

The strengths are high naturalness, rich emotional expression, and a high degree of freedom in parameter adjustment, making it ideal for narration and video production.

The disadvantages include the need for initial investment as it is paid software and the need to purchase each character separately.

Regarding commercial use, individual commercial use is basically possible with the product purchase, but a separate commercial license is required for corporate use.

This software is recommended for those who want to create creative audio works or those who seek high-quality narration.

A.I.VOICE2 Complete Guide! Detailed explanation of characteristics, installation, and usage of the successor to VOICEROID

Explaining the features and usage of A.I.VOICE2, which allows the use of Kotonoha Akane/Aoi and Yuzuki Yukari, familiar from VOICEROID videos. Detailed introduction from installation to audio export.

3. CeVIO AI | Integrated Audio Creation Software Capable of Singing

CeVIO AI is audio creation software that offers both talking and singing.

"Talk Voices" for talking and "Song Voices" for singing are sold.

It is based on technology from Techno-Speech, a venture company from the Nagoya Institute of Technology, and is particularly excellent in natural Japanese intonation and expressiveness.

Character voices with rich personalities such as "Sato Sasara" and "Suzuki Tsudumi" are popular and widely utilized in video and content production.

It is Windows-exclusive software and is sold as paid software.

By purchasing "Song Voice," it is also possible to make the characters sing.

Adjustment of emotional parameters is very fine, and since emotional expressions such as joy, anger, and sadness can be adjusted numerically, audio with rich expressiveness can be created.

Regarding commercial use, use by individual creators is relatively lenient, but a separate license is required for corporate use or for use in product sales.

This software is recommended for those who want to create audio content with rich expressiveness and those who want to try singing synthesis.

What is CeVIO AI? Detailed explanation of the features, usage, and commercial use of speech synthesis software

A complete guide to the AI singing synthesis software CeVIO AI. Explaining the characteristics of popular characters such as Sato Sasara and Suzuki Tsudumi, how to purchase, and precautions for commercial use for beginners.

4. VOICEPEAK | High-Quality Speech Synthesis Editor with Intuitive Operation

VOICEPEAK is speech synthesis software characterized by intuitive operability.

A wide lineup is offered, from voices with character personalities to voices for natural narration.

In addition to Windows and Mac, it is one of the few desktop-type speech synthesis software compatible with Linux.

The function to analyze the context of the text and add natural intonation is excellent, allowing high-quality audio to be generated even without specialized knowledge.

Because intonation, speed, volume, etc., can be edited visually on an intuitive editor screen, it is designed to be easy even for beginners to handle.

Regarding commercial use conditions, commercial use rights are included in the basic license, but separate terms may apply to character voices.

This software is recommended for those who want to produce high-quality narration or perform speech synthesis on multiple platforms.

What is speech synthesis software VOICEPEAK? Detailed explanation of features and commercial use

Detailed explanation of the characteristics of the speech synthesis software "VOICEPEAK." Also introducing commercial use terms, which vary greatly by character.

5. SofTalk | Standard Desktop Reading Software with Simple Functions

SofTalk is a standard free software for Windows that has been loved for a long time as a free reading software.

It specializes in a simple interface and basic functions, making it easy for even beginners to use.

For the speech synthesis engine, multiple engines can be selected, such as the original speech synthesis engine, MikoVoice, and SAPI.

Previously, it also supported AquesTalk (the speech engine that was the basis for Yukkuri voice), but support has now ended.

Reading can be done easily just by entering text, and it also has functions such as automatically reading the contents of the clipboard.

The strengths are that it is very lightweight and operates comfortably even on low-spec PCs, and basic operations are simple and easy to understand.

The disadvantages are that the audio lacks naturalness compared to the latest AI, and since it includes a rich variety of sound sources, the file size is over 300MB, which is very large for free software.

Regarding commercial use conditions, the software itself is free, but terms vary depending on the speech synthesis engine, so if you use it for commercial purposes, you need to check the terms of the speech engine used.

This is a recommended free reading software for those who want basic reading functions or those looking for lightweight software.

6. Bouyomi-chan | Standard Text-to-Speech Software for Streaming

Bouyomi-chan is free reading software used mainly in game streaming and live streaming, and it features the characteristic voice known as "Yukkuri voice."

It uses an older version of the speech synthesis library AquesTalk, which has the major advantage that commercial use is possible even for free.

It is lightweight free software for Windows, and because functions for linking with other software are extensive, it is often used in combination with streaming tools.

It is known as the standard software used in "Yukkuri Jikkyou" and "Yukkuri Kaisetsu" on Nico Nico Douga and YouTube.

Linking with streaming software such as OBS is also possible, and it is widely used for reading comments on YouTube streams.

The strengths are high connectivity with other software, support from a large community, and a unique, individualistic voice.

The disadvantages include that the sound quality is mechanical and lacks naturalness, installation is required, and it only supports Windows.

Regarding commercial use conditions, since it uses an older version of AquesTalk, commercial use is possible for free, but it is recommended to check the terms of use.

This reading software is recommended for those involved in game streaming, comment reading, and Yukkuri video production.

7. VOICEVOX | High-Quality Character Voice Generation Engine

VOICEVOX is high-quality speech synthesis software developed as open source, characterized by a diverse range of character voices.

Reading is possible with the voices of popular characters such as "Zundamon," "Shikoku Metan," and "Kasukabe Tsumugi."

It is desktop-based software compatible with the three major operating systems: Windows, Mac, and Linux.

It uses deep learning technology for speech synthesis, allowing for the generation of natural, high-quality audio.

Fine setting of intonation adjustment and audio parameters is possible, and it also supports professional audio editing.

A version compatible with GPU (graphics card) is also provided, allowing for faster processing on high-performance PCs.

Regarding commercial use conditions, the software itself can be used for commercial purposes, but terms vary by character, so you need to check the terms of use for the character you use.

This reading software is recommended for those who want to incorporate unique audio into creative activities and video production.

VOICEVOX Usage Complete Guide! Detailed explanation from features of AI free speech synthesis software to commercial use

Detailed explanation from the features of VOICEVOX to its usage and precautions for commercial use. A complete guide to free AI speech synthesis software that can read with popular character voices like Zundamon.

8. CoeFont | High-Quality AI Japanese Speech Synthesis Service

CoeFont is a paid Japanese speech synthesis service utilizing AI.

It is characterized by natural Japanese pronunciation and intonation, allowing for reading with natural intonation close to that of a human narrator.

A variety of voices modeled after voice actors and actors are available, allowing you to choose a voice suited to your purpose.

It also features a function to automatically add appropriate intonation and pauses based on context through unique AI technology.

It also provides a function to create an AI voice based on your own voice, allowing for the creation of original audio.

While there are limits on functions and character counts, a free plan is also available.

This service is recommended for those who want to create professional Japanese narration or seek high-quality speech synthesis.

9. COEIROINK | Open Source AI Speech Synthesis Software

COEIROINK is AI speech synthesis software developed primarily targeting creative activities.

It is desktop software compatible with Windows, Mac, and Linux, and requires installation.

In addition to official and officially recognized character voices, user-created voice models called "MYCOE" can also be used.

Fine adjustment of intonation and emotional expression is possible, allowing for the creation of more expressive audio.

Because the download size is large overall, attention to the network environment during installation is necessary.

Regarding commercial use conditions, commercial use is basically possible, but terms vary depending on the voice model used.

It is recommended for those who want to incorporate unique audio into creative activities or use a variety of voice models.

What is COEIROINK? Thorough explanation of the features, usage, and commercial use of speech synthesis software

Complete guide to the features and usage of COEIROINK. Detailed explanation from how to introduce the speech synthesis software to adding character voices and precautions for commercial use.

10. Yukumo! | Browser-based Yukkuri Voice Reading Service

Yukumo! is a browser-based reading service using Aquest Inc.'s speech synthesis library "AquesTalk."

Since it can be used directly from a browser without installation, you can start using it immediately from any device.

The biggest feature is that reading is possible with the characteristic voice known as "Yukkuri voice" (monotone voice).

It supports multiple engine versions such as AquesTalk1, AquesTalk2, and AquesTalk10, allowing you to select various voice qualities.

Text entry is simple; reading begins just by entering text into the text box on the browser.

The read audio can also be downloaded and utilized in video editing and other tasks.

Strengths include that it can be easily used without installation, it is one of the few services that allows the use of Yukkuri voice from a browser, and the operation is simple and easy even for beginners.

Disadvantages include that the naturalness of the audio is mechanical compared to the latest AI technology and there are restrictions on commercial use.

Regarding commercial use conditions, individual non-commercial use is free, but to use it for commercial purposes, you need to purchase a separate commercial license for AquesTalk.

This service is recommended for those who want to easily start creating videos such as "Yukkuri Kaisetsu" or "Yukkuri Jikkyou" without installation.

[Free is OK] Detailed Explanation of Text-to-Speech Software Introduction and Setting Method

As an example of how to use text-to-speech software, we will explain the reading method for "Ondoku"!

[Free] How to Start and Basic Settings for Browser-based "Ondoku"

"Ondoku" is a reading service that can be used immediately just by accessing it from a browser.

First, access the official site.

Enter or paste the text you want to read into the text input field.

Choose your preferred voice from "Voice."

If necessary, you can also adjust the reading speed and pitch.

Once settings are complete, click the "Read" button.

High-quality audio will be played immediately.

The read audio can be saved in MP3 format using the "Download" button.

If you want to read longer texts, you can read up to 5,000 characters by registering for free.

In this way, "Ondoku" can be used easily for free!

Why not utilize "Ondoku" for your creative activities, language learning, or business?

Tips and Setting Examples for Voice Customization

To enhance the naturalness of text-to-speech software, appropriate setting adjustment is important.

First, adjust the reading speed according to the content and purpose.

Standard speed for general explanations, and slightly slower for detailed explanations or important points, will make it easier to convey.

In language learning, making it extremely slow, such as 0.3x, is also recommended.

In Ondoku, you can also adjust the pitch of the voice, so it is effective to set it slightly higher if you want to bring out character and lower if you want to create a calm impression.

Even with free reading software, by being creative with these settings, you can create quite natural and easy-to-hear audio.

Usage Method and Precautions for Smartphones

When using text-to-speech software on a smartphone, browser-based services are the easiest.

"Ondoku" can also be accessed from a smartphone browser, allowing for high-quality reading just like on a PC.

Since many desktop-based software cannot be used on smartphones, browser-based is recommended if you want to use it across platforms such as PC, smartphone, and tablet.

When using a reading service on a smartphone, be careful about mobile data usage.

Usage in a Wi-Fi environment is recommended.

If you save the reading audio created on a smartphone to cloud storage, subsequent editing work on a PC will be smooth.

Recommended reading methods for iPhone and Android smartphones are also introduced on this page.

8 Recommended reading apps for iPhone/iPad! How to easily read text aloud on a smartphone?

Introducing recommended reading methods for iPhone and iPad (iOS). Explaining recommended web apps and reading apps that can be installed from the App Store.

[2026 Latest Version] 5 Recommended reading apps for Android smartphones!

Introducing recommended reading apps usable on Android smartphones. Also explaining the reading function standardly installed in Android smartphones.

Techniques for Utilizing Text-to-Speech Software That Can Be Done for Free

Creating Audiobooks with Text-to-Speech Software

By using text-to-speech software, you can intake information not only visually but also auditorily.

By converting long news articles or reports into audio using free reading software and listening during commute time or while doing housework, you can use time effectively.

Since high-quality reading is possible even with free services like "Ondoku", you can efficiently collect information by converting news articles and blog content into audio.

For those who want to increase the amount they read, the method of entering e-book content into reading software and converting it to audio is also effective.

With "Ondoku," anyone can easily create an audiobook.

[Free] Let's create an audiobook with speech synthesis! Summary of self-publishing methods using reading services

Detailed explanation of the method and flow of creating an audiobook using free AI reading services/software, as well as recommended services & software.

By utilizing the speed adjustment function and gradually increasing playback speed as you get used to it, you can intake more information in a short time.

Those who feel fatigue from collecting information from digital content can continue information input while reducing eye strain by utilizing reading software.

Utilizing Text-to-Speech Software for Sentence Polish and Proofreading

Text-to-speech software is also ideal for sentence proofreading and polish.

By listening to the sentences you have written with text-to-speech software, you can discover unnaturalness or errors that you wouldn't notice with your eyes.

By using software like "Ondoku" that reads with natural intonation, you can immediately discover points where the rhythm or flow of the sentence feels off.

Sentences that are too long or confusing expressions are easier to notice by listening to the reading than by seeing them with your eyes.

By listening to presentation materials and speech drafts with free reading software, it is possible to check the clarity for the listener.

By reading aloud again even after correcting the sentences, you can finish it into a more sophisticated piece of writing.

Checking business documents and emails with reading software before sending will lead to more accurate and easily conveyed content.

Utilizing Reading Audio for English and Foreign Language Pronunciation Practice and Shadowing

In foreign language learning, text-to-speech software becomes a powerful learning tool.

With multi-language compatible free services like "Ondoku", you can easily check pronunciation by reading the text of the language you are learning.

Reading software can also be utilized for Shadowing practice (practicing pronouncing in the same way immediately after the audio).

[Complete Guide] What is the method for English shadowing? Also explaining how to create free teaching materials!

Efficiently improve English skills with shadowing! Explaining a learning method that improves listening, pronunciation, and speaking simultaneously for beginners. Also introducing methods for creating teaching materials with free AI audio.

By simply imitating the native pronunciation audio from AI reading software and services, you can rapidly improve your pronunciation.

Reading software and services are also ideal for strengthening listening.

It is effective to start with simple sentences and gradually step up to difficult content.

Because you can learn with native pronunciation even with reading software that can be used for free, language learning efficiency, from speaking to listening, improves significantly.

Utilizing Text-to-Speech Software for Free in Presentations and Video Production

By utilizing text-to-speech software for presentations and video production, you can give a professional impression.

By using free services that allow commercial use such as "Ondoku", you can create high-quality narration audio without spending money.

In commentary videos on YouTube and elsewhere, reading software is useful when you do not want to use your own voice or want to make narration easier to hear.

In video production premised on commercial use, do not forget to check the terms of the free software you use and provide the necessary credit notation.

Tips for producing video audio smoothly are explained, so please take a look at this article as well!

How to quickly create narration for videos like YouTube with text-to-speech software. Tips and points

Explaining how to quickly create YouTube video narration with Ondoku. Clearly explaining from script creation to how to use Ondoku, adjustment of natural intonation, and tips for editing with video editing software. A must-see for those who want to streamline video production with text-to-speech software!

[FAQ] Troubles and Frequently Asked Questions About Text-to-Speech Software

Dealing with Specific Words That Are Not Read Well

If specialized terms or proper nouns are not read correctly, there are several ways to deal with it.

First is the dictionary function.

You can adjust the reading in Japanese by using the dictionary function with reference to this article.

How to use Ondoku's dictionary function and precautions. Register intonation adjustments for more convenience

Ondoku has a "dictionary" function. We will introduce how to use the dictionary function and its details. We will also introduce tips for using it more conveniently by registering items with intonation adjustments.

Also, you can handle it with ingenuity, such as changing Kanji to Hiragana.

When foreign language words are mixed in, a point is to try Katakana notation instead of alphabet notation.

If symbols or special characters are included, reading will be smoother if they are removed or replaced.

If it absolutely cannot be read correctly, the method of paraphrasing into a different expression is also effective.

How to Read Multiple Files Together

If you want to read multiple text files continuously, the method varies by software.

In browser-based services such as "Ondoku", you can read them all at once by simply copying and pasting multiple texts into the text box.

If long-term reading is required, it will be easier to manage by processing in multiple files divided by appropriate breaks.

Procedures for Saving and Exporting Audio

The method for saving read audio as a file varies by software.

In "Ondoku", simply clicking the "Download" button after reading allows it to be saved in MP3 format.

In desktop-based software, functions such as "Export" or "Save Audio" are selected from the menu.

Choose the format of the audio file to be saved according to the intended use.

For general purposes, the MP3 format has high versatility and a good balance between sound quality and capacity.

What Will Happen to Text-to-Speech Technology in the Future?

Due to the evolution of AI technology, the quality of text-to-speech software will further improve in the future.

More natural intonation and emotional expression will become possible, allowing for high-quality reading indistinguishable from a human voice.

High-quality speech synthesis is expected to become commonplace even in free services.

Furthermore, the accuracy of multi-language support will improve, and natural reading in more languages will be realized.

Rapidly advancing AI text-to-speech technology will further increase its importance in various fields, such as improving accessibility and streamlining content production.

Would You Like to Experience the Text-to-Speech Software That Is Perfect for You?

When choosing text-to-speech software, first clarify your intended use.

It is also important to try free-to-use reading software and find the one that is best for your purpose.

For example, with browser-based services such as "Ondoku," you can try it for free right now.

Why not actually experience free software and services that can read with the latest AI first?