Japanese Text to Speech Voice Generator

Japanese text is sent to the OfflineTTS phonemization endpoint, converted into pronunciation tokens, and returned before Kokoro synthesizes audio in the browser. The model and voice files are also downloaded separately. This means Japanese Kokoro is not a disconnected workflow even after the model is cached; do not use it for text that policy or confidentiality rules require to stay entirely off the network.

The application is configured not to retain submitted text as phonemization content, while normal infrastructure request metadata may still be processed. Generated audio is not uploaded for synthesis. If local Japanese text processing is required, compare the Supertonic engine and verify that its voice styles, pronunciation, and model download fit the project rather than assuming both engines sound the same.

Context can change a kanji reading, pitch pattern, counter, name, or abbreviation. Build a short review list from the real script: personal and place names, dates, counters, loanwords, numerals, and sentences using は, へ, or を as particles. Listen with a fluent reviewer when pronunciation matters; generated speech is not an authoritative dictionary entry or proof of language-learning accuracy.

Keep punctuation and sentence boundaries clear, then generate a small sample before a chapter or video. Compare all candidate voices with the same passage and speed, because the five presets can handle pacing differently. Record corrections in the source text rather than relying on memory, and inspect the complete WAV or MP3 export for chunk joins and unexpected pauses before publication.