Private AI Audio Tools - Free TTS, STT, Subtitles, Ebook Audio | OfflineTTS

Private AI Audio Tools in Your Browser Free text to speech, speech to text, subtitles, and ebook audio. OfflineTTS brings browser text to speech, audio to text, subtitle generation, and EPUB, PDF, or TXT to audio workflows into one private AI audio toolkit. Private by design Free to use No signup Browser-first 4 local TTS engines 99 STT languages TXT SRT / VTT exports EPUB PDF / TXT audio Workflow directory Find the right private AI audio workflow Start with the job: free text to speech, audio to text, subtitle generator, creator voice-over, or EPUB, PDF, and TXT listening. Browse all tools → Platform capabilities Local engines for TTS, STT, captions, and document audio Choose Kokoro, Kitten, Piper, Supertonic, or Whisper from the same browser-first platform for voice generation, transcription, subtitles, and reading workflows. All core tools run in the browser. English TTS and Whisper STT can work offline after model download. 54 voices · 9 languages Kokoro Primary free text to speech engine for natural browser voice generation and multilingual voice workflows. 8 expressions · lightweight Kitten Lightweight local TTS for fast drafts, smaller devices, and quick voice-over experiments. 25 voices · CPU friendly Piper CPU-friendly speech synthesis for offline narration and reliable long-form audio drafts. 5 languages · local Supertonic Multilingual browser TTS with style presets for English, Spanish, Portuguese, French, and Korean. 99 languages · transcription Whisper Audio to text, video transcription, timestamps, SRT subtitles, and VTT caption exports. Use cases Built for creators, accessibility, study, and private research The homepage links to real tools instead of thin landing pages: generate speech, transcribe audio, create subtitles, and turn documents into listening material. Creators Generate narration, transcript rough cuts, subtitles, and repurposing assets without moving scripts or clips through a third-party dashboard. Accessibility Turn text, documents, and spoken media into formats that are easier to listen to, caption, search, and review.

Study & Documents Convert reading queues, TXT exports, EPUBs, papers, and PDFs into listening workflows for revision and hands-free review. Teams & Research Use local transcription for interviews, meetings, and source material when privacy matters more than cloud convenience. Proof Why teams pick OfflineTTS over upload-first audio tools OfflineTTS is built around private browser processing, free usage, and direct export paths for voice, transcript, subtitle, and document audio work. Feature OfflineTTS ElevenLabs NaturalReader Murf Price Free $5–$22/mo $9.99/mo+ $23–$79/mo Usage limits Unlimited Per-character Free tier caps Per-character Offline mode Yes No No No Privacy model On-device / browser-first Server-side Server-side Server-side No signup or API key gate English TTS works fully offline after model download Whisper transcription runs in the browser Tools cover TTS, STT, subtitle generation, and document listening The workflows stay browser-first, but each tool family solves a different job. Here is the short version. How does OfflineTTS work? OfflineTTS runs AI models directly in your browser using WebGPU or WebAssembly. Use Kokoro, Kitten, Piper, or Supertonic for TTS and Whisper for speech to text. Is it really free? Yes. The models run on your hardware, so there are no per-generation server costs, no API keys, and no subscriptions. Does it work offline? English TTS works fully offline after model download. Non-English TTS uses lightweight phoneme conversion before local synthesis. Whisper STT works offline after model download. What can I do beyond text to speech? OfflineTTS also handles private audio transcription, subtitle exports, creator voice-over workflows, and ebook or document to audio conversion. Can I use generated speech commercially? In most creator workflows, yes. You should still review the upstream model terms for the exact engine you use before large-scale commercial deployment. What audio formats can I export? You can export WAV or MP3 from the voice workflows. Whisper transcription exports TXT, SRT, and VTT.

Ready to try it Start with the audio workflow you actually need Open the voice workspace, start transcription, or jump into the tools directory for subtitle cleanup and EPUB, PDF, or TXT listening workflows.