Private AI Audio Tools in Your Browser

Private tool directory

Popular Private AI Audio Tools

Pick the exact browser workflow you need. Transcription and subtitle tools use Whisper STT; creator voice tools use local TTS.

18

task tools

99

STT languages

0

audio uploads

STT Whisper STT Audio to Text Upload audio or video, record mic input, and export TXT, SRT, or VTT. Open tool -> SRT SRT/VTT captions Subtitle Generator Create timestamped captions from local video or audio in your browser. Open tool -> TTS Local TTS YouTube Voice Generator Paste a script and generate creator voice-over audio without an account. Open tool ->

Transcribe Audio

Turn audio, video, meetings, podcasts, and interviews into private browser transcripts.

8 tools

Audio to Text General transcription -> MP3 to Text Upload MP3 files -> WAV to Text Clean production audio -> Video to Text Extract spoken text -> YouTube Transcript Use downloaded media -> Podcast Transcription Show notes and search -> Interview Transcription Research and calls -> Meeting Transcription Private notes ->

Generate Subtitles

Create SRT and VTT captions from uploaded audio or video without sending files to a server.

7 tools

Subtitle Generator SRT and VTT export -> Auto Subtitle Generator Whisper captions -> SRT Generator SubRip files -> Subtitle Maker Private caption workflow -> Video Captions Caption video files -> AI Subtitles Browser AI captions -> Shorts Subtitle Generator Short-form captions ->

Creator Voice Tools

Generate private voice-over audio for YouTube, TikTok, and faceless channels.

3 tools

YouTube Voice Generator Creator voice-over -> TikTok Voice Generator Short-form narration -> Faceless YouTube Voice Channel narration ->

Choose Your Local AI Voice Tool

Text to speech and speech to text — all run 100% in your browser, offline and private

🗣️

Kokoro TTS

54 voices · 9 languages · Highest quality

82MB WebGPU A quality

😻

Kitten TTS

8 voices · Expressions · Lightest

24MB WebGPU Fast

🃏

Piper TTS

25+ voices · 904 dataset · Fastest CPU

75MB WASM 3-5x rt

📝

Whisper STT

99 languages · Word timestamps · Offline

240MB WebGPU Streaming

How Local Text to Speech Works

1

Type or paste

Enter up to 50,000 characters of text

2

Pick a voice

Choose from 98 voice options and styles

3

Generate

AI creates speech on your device

4

Download

Save as WAV or MP3, yours to keep

Why Choose This Local Text to Speech Tool?

🔒 Your audio never leaves your browser

All audio synthesis happens on your device. English TTS is fully offline. Non-English TTS sends only text for phonemization — audio never leaves your device.

♾️ No API keys, no signups, no limits

Just open and use. No account required. Generate as much speech as you want — it runs on your hardware, not ours.

📶 Works on planes, trains, anywhere

After the one-time model download, everything works offline. Local text to speech means no internet connection needed to generate speech.

🗣️ TTS + STT in One Tool

Text to speech with Kokoro (54 voices), Kitten (8 expressions), or Piper (25+ voices). Speech to text with Whisper — 99 languages, streaming transcription with timestamps. All open-source, all offline.

88 Voices + Speech to Text

TTS: American & British English, Japanese, Mandarin Chinese, Spanish, French, Hindi, Italian, Portuguese · STT: 99 languages with Whisper

Try TTS → Try STT →

Free Text to Speech — Frequently Asked Questions

How does OfflineTTS work?

OfflineTTS runs AI models directly in your browser using WebGPU or WebAssembly. For text to speech, choose from four engines: Kokoro TTS (54 voices, highest quality), Kitten TTS (8 expressions, lightest), Piper TTS (25+ voices, fastest on CPU), or Supertonic TTS (10 preset styles across 5 languages). For speech to text, use Whisper STT (99 languages, streaming transcription).

Is it really free?

Yes, 100% free. The AI models run on your device, so there are no per-generation server costs. OfflineTTS includes Kokoro, Kitten, Piper, and Supertonic for TTS plus Whisper for STT. No subscriptions, no per-character charges, no hidden fees.

Does it work offline?

After the initial model download (~90MB for Small model, cached in your browser), English TTS works completely offline. Non-English TTS requires an internet connection for text-to-phoneme conversion (a tiny API call), but audio synthesis still runs on your device. STT works fully offline.

What voices are available?

98 voice options and styles across 10 TTS language options, plus 99 languages for speech to text. Choose from 4 TTS engines: Kokoro TTS (54 voices, highest quality), Piper TTS (25+ voices, fastest on CPU), Kitten TTS (8 expression voices, lightest model), and Supertonic TTS (10 preset styles across English, Spanish, Portuguese, French, and Korean). For STT, Whisper provides accurate transcription with word-level timestamps.

What browsers are supported?

Chrome 113+, Edge 113+, and Safari 17.4+ support WebGPU for fastest performance. All modern browsers support the WASM fallback.

Is OfflineTTS better than ElevenLabs?

OfflineTTS is completely free with no usage limits, works offline, and keeps your data private. ElevenLabs offers more voices and higher quality but charges per character and requires an internet connection. For most use cases — YouTube voiceovers, e-learning, audiobooks — OfflineTTS delivers comparable quality at zero cost.

Can I use generated speech commercially?

In most creator workflows, yes: you can download and use generated audio in videos, podcasts, audiobooks, and commercial projects. Kokoro and Piper use permissive upstream licenses; Kitten and Supertonic are also available as local TTS engines, but you should check the upstream model terms for the exact engine you use before large-scale commercial deployment.

What audio formats can I export?

You can export audio as WAV (lossless, studio-quality) or MP3 (compressed, smaller file size). WAV is recommended for further audio editing; MP3 is great for direct use in videos and podcasts.

How much text can I convert at once?

Up to 50,000 characters per session. Longer texts are automatically split into chunks and processed sequentially with natural pauses between segments.

Is my text data safe?

English TTS is fully offline — no data leaves your browser. For non-English TTS (Japanese, Chinese, Spanish, French, Hindi, Italian, Portuguese), your text is sent to our phonemization server which converts it to pronunciation data (IPA phonemes) and returns it. The server does not log or store any text. Audio synthesis always happens on your device. STT (speech to text) is fully offline.

Free Text to Speech Use Cases

🎬 YouTube Voice-Overs

Generate professional narration for YouTube videos without expensive recording equipment. Top voices: Heart (warm, educational), Bella (energetic, vlogs), Michael (professional, reviews).

🎙️ Podcast Production

Create podcast intros, outros, ad reads, and solo episodes with AI voices. Multi-voice segments using different character voices for narrative podcasts.

📚 Audiobook Narration

Convert manuscripts to audiobooks with natural-sounding voices. Batch process chapters and export as WAV for post-production. No per-character charges — your royalties stay yours.

🎓 E-Learning & Accessibility

Add voice narration to online courses and educational materials. Make content accessible to visually impaired users. Supports 10 TTS language options across 4 engines for international audiences.

💼 Business Presentations

Add professional voice-overs to slide decks, training videos, and corporate content. Keep confidential materials private — your text never leaves your device.

🌐 Language Learning

Practice pronunciation with natural-sounding local voices and styles. 4 engines to choose from, each optimized for different needs.

Free Local Text to Speech — How OfflineTTS Compares

Looking for a free text-to-speech alternative? See how OfflineTTS stacks up against paid services.

Feature	OfflineTTS	ElevenLabs	NaturalReaders	Murf AI
Price	Free	$5–$22/mo	$9.99/mo+	$23–$79/mo
Usage Limits	Unlimited	Per-character	20 min/day (free)	Per-character
Offline Mode	✅ Yes	❌ No	❌ No	❌ No
Privacy	On-device	Server-side	Server-side	Server-side
Sign-up Required	❌ None	✅ Required	✅ Required	✅ Required
Voices	88 (9 langs)	100+ voices	60+ voices	120+ voices
Export Formats	WAV, MP3	MP3 (paid)	MP3 (paid)	MP3, WAV (paid)

Tips for Better Text to Speech Quality

✍️ Punctuate Properly

Commas add short pauses, periods add full stops. Question marks raise pitch at the end. Proper punctuation is the #1 way to improve naturalness.

🎯 Use the Large Model for Best Quality

The Large model (~600MB) produces the most natural-sounding speech. Use Small (~90MB) for quick tests, then switch to Large for production audio.

🔊 Choose the Right Engine & Voice

Kokoro TTS: Heart and Bella are rated A/A- for English. Piper TTS: Alice and James for warm narration. Kitten TTS: expression-based voices for emotional tone. Pick the engine that fits your needs.