[2026] 9 Best Text-to-Speech Software: Free & Commercial Use Tools

What types 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 offers a significant advantage in terms of cost.

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

In this guide, we will provide a detailed explanation of the features and usability of everything from browser-based types that require no installation to high-performance desktop versions.

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

After reading this article, you are sure to find the text-to-speech software that is perfect for you.

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

If you are 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 your browser.

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

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

Furthermore, commercial use is also OK for free (credit notation is required for the free version).

For text-to-speech conversion, why not start by using "Ondoku" for free?

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 browser-based type features the advantage of being usable from a web browser without the need for installation.

It can generate high-quality audio by utilizing AI engines on the cloud.

The desktop-based type is the kind you install on your computer to use, which has the advantage of being usable even in offline environments.

Some are released as free software.

Additionally, some paid installation-type software features attractive character settings.

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 benefit of being usable immediately without installation.

Services like "Ondoku" allow you to use the latest AI speech synthesis engines regardless of your PC's performance, enabling high-quality reading.

Furthermore, because 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.

A characteristic feature is the existence of software specialized for specific purposes, such as reading comments during video streaming.

While there are high-performance free software options, they may require time and effort for installation and configuration.

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 stream reading, or want to use character voices.

What are the Differences Between Free and Paid? Checking for Commercial Use is Also Recommended

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

Even free text-to-speech software includes basic reading functions, but there may be limits on character counts or advanced adjustment features.

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 access to a wider variety of voices, detailed adjustment functions, and the ability to use it commercially without credit.

If you want to use it for free, it is important to first check the software's terms of service carefully 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 your purpose, such as creating video narration, language learning, or improving accessibility.

Of course, ease of use is also important.

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

Naturalness of audio is also a key point; specifically, if you need natural Japanese intonation and pronunciation, it is best to choose software specialized for Japanese.

If you want to use it for free, it is also important to check the details of functional limitations and see if they affect your intended use.

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

[Free Options Available] 9 Recommended Text-to-Speech Software Programs

Now, we will introduce in detail which text-to-speech software programs are specifically recommended!

1. Ondoku
2. A.I.VOICE
3. CeVIO AI
4. VOICEPEAK
5. SofTalk
6. Bouyomichan
7. VOICEVOX
8. CoeFont
9. COEIROINK

1. Ondoku | High-quality Audio Service Available Immediately via Browser

"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!

It features natural audio utilizing the latest AI technology.

There is also a wide variety of voice types; for example, in Japanese, you can choose from 16 different voices.

It is a text-to-speech service that can be used for free, and a key feature is that commercial use is OK, such as for video monetization or business use.

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

Commercial use (business use) is possible with Ondoku. Regardless of whether you are an individual or a corporation, use for the purpose of obtaining profits such as money directly or indirectly is commercial use. However, please note that prohibited acts are established in Ondoku. This time, we will cover what you can and cannot do with Ondoku...

You can read up to 1,000 characters without registration and 5,000 characters after registration for free, so it can handle creating long-form narrations for free.

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

Even first-time users can operate it intuitively.

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

Although it is a free web service, it can read with the highest quality audio, so it is recommended for your first experience with AI text-to-speech.

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

If you are unsure which text-to-speech software to choose, 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 extremely natural Japanese speech.

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

It supports 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 strength, pitch, and speed of the reading emotion, more natural conversation-style reading is possible.

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

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

Weaknesses include the fact that it is paid software requiring an initial investment, and characters must be purchased separately.

Regarding commercial use, it is basically possible for individuals with a 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 seek high-quality narration.

A.I.VOICE 2 Complete Guide! Detailed explanation of the features, installation, and usage of the successor to VOICEROID

Explaining the features and usage of A.I.VOICE 2, where you can use Kotonoha Akane/Aoi and Yuzuki Yukari, familiar from VOICEROID videos. Detailed introduction from installation to audio export.

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

CeVIO AI is voice creation software that offers both talk and singing capabilities.

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

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

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

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

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

Adjustment of emotional parameters is very detailed, allowing for expressions of joy, anger, sadness, etc., to be adjusted numerically, enabling the creation of audio with rich expressiveness.

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

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

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

A complete guide to the AI singing synthesis software CeVIO AI. Explaining features of popular characters like 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 from character-style voices to natural narration-style voices is offered.

It is one of the few desktop-type speech synthesis software programs that supports Linux in addition to Windows and Mac.

Its function for analyzing text context and applying natural intonation is excellent, allowing high-quality audio to be generated without specialized knowledge.

With an intuitive editor screen where you can visually edit intonation, speed, volume, etc., it is designed to be easy even for beginners.

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 across multiple platforms.

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

Explaining in detail what features the speech synthesis software "VOICEPEAK" has. Also introducing commercial use terms, which vary greatly by character.

5. SofTalk | Standard Desktop Text-to-Speech Software with Simple Functions

SofTalk is a standard free software program that has long been favored as a free text-to-speech software for Windows.

Focusing on a simple interface and basic functions, it can be easily used by beginners.

The speech synthesis engine allows selection from multiple engines, such as the original speech synthesis engine, MikoVoice, and SAPI.

It formerly supported AquesTalk (the engine that became the basis for Yukkuri voices), but that support has now ended.

You can easily read text just by entering it, and it also features functions such as automatically reading the contents of the clipboard.

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

Weaknesses include a lack of naturalness in the voice compared to the latest AI, and the fact that the file size is over 300MB because it includes many sound sources, which is quite large for free software.

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

This free text-to-speech software is recommended for those seeking basic reading functions or looking for lightweight software.

6. Bouyomichan | Standard Text-to-Speech Software for Streaming

Bouyomichan is a free text-to-speech software mainly used for game and live streaming, characterized by the distinctive voice known as the "Yukkuri voice."

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

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

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

Linkage with streaming software such as OBS is also possible, and it is widely used for reading YouTube stream comments.

Strengths include high connectivity with other software, support from a large community, and its unique, individualistic voice.

Weaknesses include the fact 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, free commercial use is possible, but it is recommended to check the terms of use.

This text-to-speech 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 wide variety of character voices.

It is possible to read in the voices of popular characters such as "Zundamon," "Shikoku Metan," and "Kasukabe Tsumugi."

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

It uses deep learning technology for speech synthesis, allowing it to generate natural, high-quality audio.

Adjustment of intonation and detailed setting of audio parameters are possible, accommodating professional audio editing.

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

Regarding commercial use conditions, the software itself is available for commercial use, but terms vary by character, so you need to check the terms of use for the character you use.

This text-to-speech software is recommended for those who want to incorporate unique voices into creative activities or video production.

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

Detailed explanation from VOICEVOX features to usage and precautions for commercial use. A complete guide to the free AI speech synthesis software that can read in 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 features natural Japanese pronunciation and intonation, allowing for reading with natural inflections close to those of a human narrator.

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

With its unique AI technology, it also features a function to automatically add appropriate intonation and pauses based on the understanding of the context.

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

A free plan is also available, although there are limitations on functions and character counts.

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

9. COEIROINK | Free Software Supporting Various Voice Models

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

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

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

Detailed adjustments for intonation and emotional expression are possible, allowing for the creation of more expressive audio.

Because the download size is generally large, caution is needed regarding the network environment during installation.

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

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

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

A 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.

[Free is OK] Detailed Explanation of How to Introduce and Set Up Text-to-Speech Software

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 text-to-speech service you can use right away just by accessing it from your browser.

First, access the official website.

Enter or paste the text you want 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" is easy and free to use!

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

Tips and Setting Examples for Voice Customization

To enhance the naturalness of text-to-speech software, appropriate setting adjustments are 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.

For language study, making it extremely slow, such as 0.3x, is also recommended.

In Ondoku, you can also adjust the pitch of the voice, so setting it slightly higher if you want to bring out a character's personality, or lower if you want a calm impression, is effective.

Even with free text-to-speech software, by fine-tuning these settings, you can create audio that is quite natural and easy to listen to.

Usage and Precautions for Smartphones

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

"Ondoku" can be accessed from a smartphone browser and allows for high-quality reading just like on a PC.

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

When using a text-to-speech service on a smartphone, be mindful of mobile data usage.

It is recommended to use it in a Wi-Fi environment.

If you save read audio created on a smartphone to cloud storage, subsequent editing work on a PC will go smoothly.

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 Your 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 that can be used on Android smartphones. Also explaining reading functions standard on Android smartphones.

Text-to-Speech Software Utilization Techniques You Can Do for Free

Create Audiobooks with Text-to-Speech Software

By using text-to-speech software, you can take in information not only visually but also aurally.

By converting long news articles or reports into audio with free text-to-speech software and listening to them during commutes or while doing chores, you can make effective use of your time.

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

For those who want to increase their reading volume, the method of entering e-book content into text-to-speech software to convert it into audio is also effective.

With "Ondoku," anyone can easily create audiobooks.

[Free] Let's Create Audiobooks with Speech Synthesis! Summary of Self-Catering Methods Using Reading Services

Detailed explanation of the methods and workflow for creating audiobooks using free AI reading services/software, along with recommended services and software.

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

For those who feel fatigued from gathering information from digital content, utilizing text-to-speech software allows you to continue information input while reducing eye strain.

Utilize Text-to-Speech Software for Sentence Refinement and Proofreading

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

By listening to sentences you have written with text-to-speech software, you can discover unnaturalness or errors that you might not notice by eye.

Using software that reads with natural intonation, such as "Ondoku", allows you to immediately find points where the rhythm or flow of the sentences is off.

You can notice overly long sentences or confusing expressions more quickly by listening to them being read than by looking at them.

It is also possible to confirm the ease of understanding for the listener by listening to presentation materials or speech drafts with free reading software.

By reading and checking again after correcting the sentences, you can finish them into more polished writing.

Checking business documents and emails with reading software before sending will make the content more accurate and easier to convey.

Utilize Read Audio for English or 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 text in the language you are studying.

Reading software can also be utilized for shadowing practice (the practice of 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 boost your English skills with shadowing! A learning method that improves listening, pronunciation, and speaking simultaneously, explained for beginners. Also introducing how to create materials with free AI voices.

Just by imitating the native-pronunciation audio from AI reading software and services, you can steadily improve your pronunciation.

Reading software and services are also ideal for strengthening listening skills.

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

Since you can study with native pronunciation even with free text-to-speech software, the efficiency of language learning, from speaking to listening, will be greatly improved.

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

By utilizing text-to-speech software in 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 incurring costs.

In explanatory videos such as on YouTube, reading software is useful when you do not want to use your own voice or want narration that is easier to hear.

In video production intended for commercial use, be sure to check the terms of the free software you use and remember to provide the necessary credit notation.

Since we explain tips for smoothly producing video audio, please be sure to see 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. Easy-to-understand explanation from script creation to how to use Ondoku, adjustment for 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] Text-to-Speech Software Troubles and Frequently Asked Questions

What to Do When Specific Words Are Not Read Correctly

If technical terms or proper nouns are not read correctly, there are several ways to handle it.

First is the dictionary function.

By using the dictionary function while referring to this article, you can adjust the Japanese reading.

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

Ondoku has a "dictionary" function. We will introduce how to use the dictionary function and its details. Also introducing small tricks to make it more convenient by registering items with adjusted intonation.

Also, you can handle it with measures such as changing kanji to hiragana.

When foreign language words are mixed in, trying to use katakana notation instead of alphabet notation is also a key point.

If symbols or special characters are included, removing or replacing them will make the reading smoother.

If it absolutely cannot be read correctly, paraphrasing into another expression is also an effective method.

How to Read Multiple Files in Batches

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

With browser-based services like "Ondoku", you can read everything at once just by copying and pasting multiple texts into the text box.

If long-duration reading is necessary, it will be easier to manage by dividing it into multiple files with appropriate breaks.

Procedures for Saving and Exporting Audio

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

With "Ondoku", you can save in MP3 format just by clicking the "Download" button after reading.

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

Choose the format of the audio file to save according to your intended use.

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

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

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

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

It is thought that high-quality speech synthesis will become common even in free services.

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

AI text-to-speech technology, which is progressing rapidly, will likely gain even more importance in various fields, such as improving accessibility and streamlining content production.

Why Not Experience the Text-to-Speech Software That's 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 purposes.

For example, with browser-based services like "Ondoku", it is possible to try it for free right now.

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