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Private AI Audio Tools in Your Browser

Free Text to Speech Online Private AI Voice Generator

Audiobooks Subtitles Speech to Text

Convert text to speech online directly in your browser with voices from Kokoro, Piper, Kitten, Supertonic, and Pocket TTS. This offline text to speech workflow needs no signup or OfflineTTS per-character bill. English voices can work offline after download when cached models and the selected engine support local generation.

Start TTS Start STT Ebook to Audio
Private by design Free to use No signup Browser-first

5

local TTS engines

99

STT languages

TXT

SRT / VTT exports

EPUB

PDF / TXT audio

Try it now

Try text to speech now

Free Text to Speech Online with Natural AI Voices

Paste your text, choose an English voice, and generate private speech without leaving this page. Your text and generated audio stay in your browser.

0 / 1,500

For longer scripts, more languages, synchronized subtitles, and generation history, use the full workspace.

Generated illustration for Heart, a American English female Kokoro voice

Hear Heart

American English Β· warm, natural

Read this voice's narration sample

This morning I opened the window before making coffee. The street was still quiet, and a delivery bike passed slowly beneath the trees. I made a small list for the day, then decided the first item could wait until after breakfast.

Open advanced workspace

Ready. The voice model downloads only after you select Generate Speech.

What the Homepage Tool Doesβ€”and Does Not Do

A focused English Kokoro preview

The embedded homepage control accepts up to 1,500 characters and provides five curated American or British English voices, three speed presets, waveform playback, and WAV or MP3 download. It is designed for a quick first generation, not as the full five-engine workspace. Open the advanced TTS tool for longer scripts, every Kokoro voice, model precision, history, and optional subtitle timing.

Local inference still needs assets and review

The first generation downloads the Kokoro model and voice assets. English text and generated audio are not uploaded to an OfflineTTS synthesis account, while model delivery, hosting, and ordinary site analytics remain network activity covered by the Privacy Policy. Listen for names, numbers, pronunciation, and pacing, and check the upstream model, voice, source-text, and publication rights before commercial use.

Four simple steps

How to Convert Text to Speech Online

Use the homepage tool for a fast voice preview, waveform playback, and downloadable audio. The model stays unloaded until you ask it to generate speech.

First visit: download the Kokoro model. Later visits: reuse the browser cache and generate English speech offline when supported.

  1. 01

    Enter your text

    Paste up to 1,500 characters into the homepage text to speech tool. Your draft remains in the browser.

  2. 02

    Choose an AI voice

    Pick a curated American or British English voice and select a relaxed, natural, or brisk generation speed.

  3. 03

    Generate speech locally

    Select Generate Speech. Kokoro downloads only on first use, then creates the audio on your device with WebGPU or WASM.

  4. 04

    Play or download the audio

    Review the result with the waveform player, seek to any point, and download the finished speech as WAV or MP3.

Workflow directory

Free Text to Speech & Private AI Audio Workflows

Start with the job: free text to speech online, audio to text, subtitle generator, creator voice-over, or EPUB, PDF, and TXT listening.

Browse all tools β†’

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 β†’

Subtitle cleanup

SRT / VTT

Subtitle Cleaner

Remove timestamps, labels, and formatting from existing SRT or VTT files before editing or text-to-speech.

SRT VTT Clean text
  • Parse existing subtitle files
  • Strip timestamps and speaker labels
  • Keep files in the browser
Open workflow β†’

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 β†’

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 β†’

Audio effects

16 effects

Equalizer & Audio Effects

Shape tone, boost bass, add reverb, remove noise, and change a voice β€” every effect rendered offline in the browser.

EQ Bass Reverb Noise
  • Ten-band EQ with a spectrum view
  • Bass boost, reverb, and noise removal
  • Deterministic offline renders
Open workflow β†’

Edit & convert

WAV + MP3

Cut, Join & Convert

Trim on the waveform, merge files with crossfades, reverse audio, and convert sample rates or channels.

Trim Merge Convert Reverse
  • Sample-accurate cuts with fades
  • Crossfade or gap between tracks
  • WAV and MP3 export
Open workflow β†’

Analyze

BPM + Camelot

BPM, Key & Speed Edits

Detect tempo and musical key, then make nightcore, sped-up, slowed + reverb, vaporwave, or 8D versions.

Tempo Key Nightcore 8D
  • Onset-histogram tempo and chroma key
  • Speed edits with or without pitch
  • Tone generator and silence trimming
Open workflow β†’

TTS directory

Text to Speech for Every Language & Use Case

Jump straight to a dedicated TTS page for your language or creative job β€” each with curated voices, local audio synthesis, and WAV/MP3 export.

Voiceover & Audio Studio

Post-Process & Master Voiceovers on Your Device

Generated your speech or have audio recordings to polish? Equalize voice tone, remove background noise, trim silence, adjust pacing, and master audio directly in your browser. These audio editing tools process selected audio locally. Model downloads and site services have separate network paths; see our privacy policy.

Browse all 20+ tools β†’

Creator workflows

AI Audio Tools for YouTube, TikTok, Podcasts, and Captions

Use browser-based voice-over, transcription, and caption workflows to move from a creator script or recording to narration, searchable text, and subtitle files.

Choose the output you need, then open the dedicated tool for your video, podcast, or short-form workflow.

Free AI voice

Generate speech from any reviewed text

Turn a draft into browser-based narration, accessibility audio, or a downloadable WAV or MP3 sample without an account.

Text to voice β†’

Creator voice-over

Narrate videos and short-form scripts

Generate YouTube, Shorts, TikTok, Reels, and faceless-channel narration in one browser voice workspace.

Script to voice-over β†’

Private transcription

Transcribe creator media

Turn local audio or video into text, timestamps, SRT, or VTT without uploading the source file.

Transcript and captions β†’

Subtitle cleanup

Clean existing subtitle files

Remove timestamps, speaker labels, tags, and duplicate lines from SRT or VTT before repurposing.

Clean subtitle text β†’

Script preparation

Format scripts for TTS

Break long paragraphs into speaking units, add pacing cues, and estimate narration duration.

TTS-ready script β†’

Text preparation

Remove text that sounds wrong

Strip URLs, HTML, emoji, and formatting artifacts before voice generation.

Clean narration text β†’

Long-form listening

Turn documents into audio

Parse EPUB, TXT, and text-based PDF files into resumable paragraph audio and a local read-along.

Document audio β†’

Platform capabilities

Local engines for TTS, STT, captions, and document audio

Choose Kokoro, Kitten, Piper, Supertonic, Pocket TTS, 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 Β· 9 languages

Kokoro

Primary free text to speech engine for natural browser voice generation and multilingual voice workflows.

8 expressions Β· lightweight

Kitten

Lightweight local TTS for fast drafts, smaller devices, and quick voice-over experiments.

25 voices Β· CPU friendly

Piper

CPU-friendly speech synthesis for offline narration and reliable long-form audio drafts.

31 languages Β· local

Supertonic

31-language multilingual browser TTS with local Unicode processing and ten built-in voices.

8 voices Β· voice cloning

Pocket TTS

Clone your voice by recording it or uploading audio, plus 8 built-in voices β€” all generated locally in your browser.

99 languages Β· transcription

Whisper

Audio to text, video transcription, timestamps, SRT subtitles, and VTT caption exports.

Use cases

Built for creators, accessibility, study, and private research

Start with text to speech on this page, then use focused tools to 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

How OfflineTTS differs from an upload-first workflow

OfflineTTS is built around private browser processing, free usage, and direct export paths for voice, transcript, subtitle, and document audio work.

Feature OfflineTTS Typical upload-first service
Speech processing Runs in the browser Media or text is commonly sent to the provider
Account Not required for the public tools Often required for generation or saved projects
Product charge No OfflineTTS subscription or per-character meter Depends on the provider's current plan
Offline behavior Engine, language, cache, and asset dependent Depends on the provider and application
Responsibility User reviews output and upstream terms Provider features and terms vary
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

Knowledge Base

Guides, Benchmarks & Tutorials

In-depth technical guides on browser speech synthesis, audio privacy, and model architectures.

View all 32 guides
Guide 2026-08-15

Pocket TTS Guide: Voice Cloning in Your Browser

Pocket TTS runs a 100M voice model in your browser. Learn how to clone voices, use 8 built-in voices, and export WAV or MP3 β€” completely offline.

Read guide →
Guide 2026-07-26

ElevenLabs Features & Pricing: Which Plan Is Worth It in 2026?

An honest guide to ElevenLabs Starter, Creator, voice cloning, Studio, Music, Dubbing, and ElevenAgentsβ€”plus who should keep using free local TTS.

Read guide →
Guide 2026-07-24

OfflineTTS vs Amazon Polly: Free Local TTS vs AWS Cloud

Compare OfflineTTS and Amazon Polly on pricing, voice quality, privacy, offline capability, SSML support, APIs, and production workflow.

Read guide →
Guide 2026-07-24

OfflineTTS vs Azure Speech: Compare Free TTS with Microsoft's Cloud

Compare OfflineTTS and Microsoft Azure Speech on pricing, voices, privacy, offline use, SSML, custom voice, APIs, and enterprise workflow.

Read guide →

Free text to speech online FAQ

Direct answers about free voice generation, downloads, offline use, available voices, and browser privacy.

Is this text to speech online tool free?

Yes. You can generate speech on the homepage without an account, API key, subscription, or per-character charge. The voice model runs on your device, so OfflineTTS does not need to charge for server inference.

How do I convert text to speech online?

Paste up to 1,500 characters into the homepage tool, choose an English AI voice and speed, then select Generate Speech. When generation finishes, use the waveform player to listen or download the result.

Can I download text to speech audio as MP3 or WAV?

Yes. Every successful homepage generation can be downloaded as WAV or encoded to MP3 in your browser. The advanced TTS workspace provides the same audio formats for longer scripts.

Does text to speech work offline?

The first English generation downloads and caches the Kokoro model and selected voice. After those files are available, English text to speech can work offline in a compatible browser. Non-English voices may need an online phoneme-conversion step.

Which AI voices can I use?

The homepage offers five curated American and British English voices for quick generation. Open the advanced workspace to browse all 54 Kokoro voices across nine languages or compare Kitten, Piper, Supertonic, and Pocket TTS.

Does OfflineTTS upload my text or generated audio?

No. The homepage generates and plays English speech in your browser. Your text and generated waveform are not uploaded to an OfflineTTS account or generation server.

Can I use generated speech commercially?

Many creator workflows permit commercial use, but licensing depends on the selected upstream model and voice. Review the relevant model terms before publishing or distributing audio commercially.

Can I edit an audio file without uploading it?

Yes. The audio tools decode your file with the browser's own codecs, apply the effect with an offline render, and encode the result as WAV or MP3 in the same tab. The file is never uploaded to an OfflineTTS processing server.

Which audio effects are available?

A ten-band equalizer, bass boost, volume boost and peak normalization, convolution reverb, spectral noise removal, a sixteen-preset voice changer, pitch shifting, and tempo changes with or without pitch lock. Trim, join, reverse, and sample-rate conversion cover the editing side, and BPM, key, Camelot code, and loudness analysis cover measurement.

What audio formats can these tools read and write?

Inputs are MP3, WAV, OGG, Opus, FLAC, M4A, AAC, and the audio track of MP4 or WebM video. Outputs are WAV at 16-bit PCM and MP3 at 128, 192, or 320 kbps. FLAC, OGG, and M4A export are not offered because encoding them in the browser would need a large WASM codec.

Is the tempo and key detection accurate?

It is a good starting point rather than a studio reference. Tempo comes from an onset-interval histogram folded into a 70 to 190 BPM range, which is reliable on music with a clear beat and can lock onto a subdivision on syncopated or free-tempo material. The key estimate correlates a chromagram against major and minor profiles, and the tool reports the harmonic relationships it found rather than claiming certainty.

Do these audio tools work offline?

They work without a network round trip because all processing is local JavaScript and Web Audio. The page itself still needs to load once, and the tools only need the browser's built-in audio codecs, so no model download is required.

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.

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