Explainer
冬になるとスマホの電池が早く減るのはなぜでしょうか。実はとてもシンプルな理由があります。
Why does a phone battery run down faster in winter? There's actually a very simple reason.
Voices · Japanese
Kenji, a Japanese male AI voice
Kenji is a male Japanese voice for Pāṇini TTS, with a calm, helpful tone. The playground opens with the sentence from Kenji's own reference recording; replace it with your script and press play.
もしもし、保険料の支払い期限が来週なんですが、オンラインで二分もあれば簡単にお支払いいただけますので、よろしくお願いします。
62 chars62/220
Japanese
Voices
Free to play in your browser without an account, up to 220 characters at a time. To save the audio, sign up free for 10,000 characters and one voice clone, no card required: the dashboard saves WAV and the API returns MP3.
Last verified 26 October 2026
About Kenji
What Kenji suits
Kenji reads Japanese with a standard accent in a calm, helpful tone. It suits tech explainers, tutorials and quiet horror narration.
- Language
- Japanese
- Accent
- Standard
- Tone (catalogue)
- Calm, Helpful
- Gender
- Male
- Model
- Pāṇini TTS
Sample lines
Three lines to try with Kenji
Lines a creator would really use in Japanese. Each one plays live in Kenji's voice; copy any of them into the playground to change it.
Tutorial
まず設定を開いて、プライバシーをタップしてください。
First open Settings and tap Privacy.
Horror story
真夜中、廊下の足音がドアの前でぴたりと止まりました。
At midnight, the footsteps in the hallway stopped dead outside the door.
Languages
Kenji can read other languages too
A Pāṇini TTS voice is not locked to one language. The language comes from the text you type, so Kenji can read any of the 250+ languages Pāṇini TTS supports, including text that mixes two languages.
Kenji's accent carries over: a script in another language sounds like a Japanese speaker reading it. That is useful for bilingual channels; for a native sound in another language, choose a voice recorded in it.
More on Japanese text to speech. See text to speech in every language.
Japanese voices
Other Japanese voices
Nearby languages
Voices in related languages
Browse all 63 voices by language, make a clone of your own voice from a 10-second sample, start from the free voice-over scripts, or see everything for creators.
Commercial use
Use Japanese AI voice-overs on monetised channels
- Use the audio in YouTube videos, Shorts, Instagram Reels, podcasts and ads, including on monetised channels.
- This applies to the free tier and to paid credits. No attribution to Sonex Labs is needed.
- You are responsible for your script, and for disclosing realistic synthetic content where a platform asks you to.
The full wording is in our terms of service.
YouTube
Can a channel with an AI voice be monetised?
Yes, AI voices are allowed. What YouTube limits is mass-produced, repetitive content: videos made from a template with little original work. Its July 2025 update renamed that rule from “repetitious” to “inauthentic” content (YouTube’s monetisation policies).
Write your own script, add your own research or editing, and keep one consistent voice for the channel. Where a realistic AI voice could mislead viewers, use YouTube’s altered or synthetic content label. The monetisation decision is always YouTube’s.
FAQ
Kenji, answered
Yes. Play Kenji on this page without an account, up to 220 characters at a time. A free account adds 10,000 characters and one voice clone, no card required. After that, Pāṇini TTS costs $0.03125 per 1,000 characters, the same rate for every language.
Yes, after free sign-up. The playground above plays Kenji in your browser only, with no account. Sign up free and the dashboard saves each clip as a WAV file (Download audio), or the API returns MP3 when you set "output_format": "mp3".
Yes. Audio you generate, on the free tier or with paid credits, can be used on monetised YouTube channels, Shorts, Reels and in ads, with no attribution. YouTube limits mass-produced, repetitive videos, not AI voices, so write your own script and keep your edits original. The monetisation decision is YouTube's.
The audio you generate is yours to use, including commercially, with no attribution and no royalties to Sonex Labs. You are responsible for the script itself: if you read someone else's text, you need their permission.
Yes. Kenji can read any of the 250+ languages Pāṇini TTS supports, because the language comes from the text you type, not from the voice. Kenji's accent carries over, so a script in English sounds like a Japanese speaker reading English. For a native sound in another language, pick a voice recorded in it from the full voice list.
Make your first Japanese voice-over with Kenji
10,000 free text-to-speech characters and one free voice clone that speaks every language, no card required. Every language is billed at the same rate.