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.

Start TTS Start STT Ebook to Audio
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 →

Whisper STT

99 languages

Audio to Text

Private browser transcription for uploaded audio or video with transcript and subtitle-ready exports.

TXT SRT VTT Browser Whisper
  • Upload audio or video files
  • Export transcript or subtitles
  • Keep media on your device
Open workflow →

Captions

SRT + VTT

Subtitle Generator

Generate subtitle-ready SRT and VTT files for creator media, reviews, and accessibility workflows.

SRT VTT Timestamps
  • Built around subtitle exports
  • Great for Shorts and Reels
  • Pairs with subtitle cleanup tools
Open workflow →

Creator audio

WAV + MP3

Voice-Over Workflows

Generate creator narration, faceless channel audio, and short-form script voice-over directly in your browser.

YouTube TikTok Faceless
  • Paste scripts and generate narration
  • Export WAV or MP3
  • Built for repeatable creator workflows
Open workflow →

Reading workflows

EPUB / PDF / TXT

Ebook to Audio

Convert EPUB, PDF, and TXT reading material into speech for study, accessibility, and audiobook draft listening.

EPUB PDF TXT WAV/MP3
  • Parse long-form reading material
  • Review sections before generation
  • Export listening-ready audio
Open workflow →

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

Private AI audio tools FAQ

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.

Open TTS Workspace Open STT Workspace Browse Tools