OfflineTTS

OfflineTTS is a browser-based set of private AI audio tools for text-to-speech, speech-to-text, subtitles, audio-to-text, and ebook-to-audio workflows. It is presented as free and runs in the browser, with no signup or API key mentioned in the site metadata. The page frames it around private audio processing for users who need these functions without leaving the browser.

Several text-to-speech and speech-to-text options are listed under the TTS & STT area. Kokoro TTS is described with 54 voices and 9 languages and marked as best quality. Kitten TTS is listed with 8 voices, a 24 MB size, and the label lightest. Piper TTS is described with 26 voices, 75 MB, and fastest CPU. Supertonic TTS is shown with 5 languages, 10 styles, and local. Whisper STT is listed with 99 languages and word timestamps. The voices area also refers to all 54 voices, A-rated Heart and Bella voices, and female, male, and deep male voice groupings, along with English, Chinese, Japanese, Spanish, French, and Hindi.

OfflineTTS also includes tools beyond basic TTS and STT. The site lists Audio to Text, Subtitle Generator, YouTube Voice Generator, Ebook to Audio, Text Cleaner, Punctuation Fixer, Subtitle Cleaner, and Script Formatter. Its use cases include YouTube Shorts and Reels, audiobook work, podcasting, e-learning, accessibility, and narration. The site title and metadata describe it as free private AI audio tools in the browser, and the visible page text identifies it as part of OfflineTTS.