Free AI Text to Speech Online

What Is AI Text to Speech?

AI text to speech (TTS) converts written text into natural-sounding spoken audio using machine learning. Unlike older text-to-speech technology that sounded robotic and unnatural, modern AI TTS models like Kokoro produce speech with human-like prosody — natural pauses, expressive intonation, and appropriate emphasis. The result sounds like a real person reading your text, not a computer. SoundTools uses Kokoro, an 82-million-parameter AI model that runs entirely in your browser via ONNX Runtime Web, so no text is ever uploaded to a server. Everything is private and runs locally on your device.

How to Convert Text to Speech Online — Step by Step

Converting text to speech is simple with SoundTools. Here's how to get the best results:

• Enter Your Text: Type directly in the text area or paste text from anywhere. You can also click "Upload .txt file" to import any plain text file. The character count and estimated audio duration update live as you type. There is no character limit — convert short quotes, full articles, scripts, or entire documents.
• Choose a Voice: Browse the voice grid grouped by American Female, American Male, British Female, and British Male. Click the ▶ play icon on any voice card to hear a preview. Click the card itself to select that voice for generation. Each voice has a distinct character — warm and conversational, professional and crisp, or deep and authoritative.
• Adjust Speed (Optional): Use the speaking speed slider to go from 0.5× (half speed, very slow) to 2.0× (double speed, fast). The default 1.0× is natural speaking pace. For detailed instructions or accessibility, try 0.75×. For quick scanning, try 1.5×.
• Click Generate Speech: The first time you generate, the AI model downloads (~100 MB). This is a one-time download — subsequent visits load from your browser cache in seconds. Audio starts playing sentence by sentence as it's generated, so you hear results almost immediately even for long texts.
• Download Your Audio: After generation, click "Download WAV" for lossless quality or "Download MP3" for a smaller file. Both are watermark-free. You can regenerate with a different voice or speed at any time.

The 20+ AI Voices Available

SoundTools offers four categories of natural AI voices, each trained on distinct speech data for unique character:

American English Female (11 voices): Heart (warm and expressive — our most popular), Bella (friendly and conversational), Sarah (warm and natural), Nicole (bright and energetic), Nova (modern and dynamic), Sky (light and clear), Alloy (neutral and professional), Aoede (musical and smooth), Jessica (crisp and precise), Kore (calm and measured), and River (soft and flowing). For general-purpose use and voiceovers, Heart and Bella are our most recommended.

American English Male (8 voices): Adam (deep and authoritative — great for documentaries), Michael (professional and balanced), Eric (friendly and warm), Liam (young and casual — perfect for social media content), Onyx (rich and deep), Echo (clear and resonant), Fenrir (strong and dramatic), and Puck (playful and light). For narration and professional content, Adam and Michael excel.

British English Female (4 voices): Emma (warm and refined), Alice (elegant and precise), Isabella (sophisticated and clear), and Lily (bright and polished). British accents add a distinctive quality to audiobooks, educational content, and professional presentations.

British English Male (4 voices): George (distinguished and deep), Daniel (professional and assured), Lewis (modern and natural), and Fable (storytelling and rich — perfect for audiobooks and narratives). George and Fable are particularly popular for documentary-style narration.

Text to Speech Use Cases

Voiceovers for YouTube Videos, TikTok, and Reels

AI voiceovers are one of the fastest-growing content creation trends. Instead of recording your own voice (which requires equipment, a quiet room, and multiple takes), simply write your script, select a voice, and generate professional narration in seconds. Download the audio, import it into your video editor, and you're done. No voice actor fees, no recording setup, no editing noise out.

Study and Learning — Listen While You Multitask

Research shows that hearing text read aloud improves retention and comprehension. Students can paste their study notes, textbook chapters, or lecture transcripts and listen while commuting, exercising, or doing chores. Speed up to 1.5× for efficient review sessions once you know the material. Slow down to 0.75× for complex technical content you need to really absorb.

Proofreading by Ear — Catch Errors Your Eyes Miss

Professional editors and writers know a secret: hearing your writing read aloud exposes problems that silent reading hides. Awkward sentences, missing words, repetitive phrasing, and grammatical errors become immediately obvious when spoken. Paste your draft, click generate, and listen. You'll catch mistakes in minutes that hours of rereading missed.

Accessibility — Reading for Everyone

Text to speech removes reading barriers for people with visual impairments, dyslexia, reading difficulties, or fatigue. Any written content — articles, emails, documents, websites — can be converted to natural-sounding speech. The combination of natural AI voice quality and adjustable speed makes content more accessible than ever before.

Podcasts and Audio Content

Create narration for podcast episodes, generate intro and outro scripts, produce sponsor reads, or experiment with different voices for different segments. Download as MP3, import into your audio editor, and mix with music or sound effects. Full podcast episodes from written scripts in minutes.

Audiobooks and Long-Form Reading

Self-publishing authors can generate complete audiobook narrations from their manuscripts. Choose Fable or George for a storytelling quality that suits fiction, or Heart or Emma for memoirs and non-fiction. While it won't replace a professional narrator for a published audiobook, it's perfect for personal listening, advance reader copies, and testing how your book sounds.

Language Learning and Pronunciation

Hear natural American or British English pronunciation for any word, phrase, or sentence. Great for non-native English speakers learning pronunciation, students practicing listening comprehension, or teachers creating pronunciation examples for students.

How SoundTools Compares to Other Text to Speech Tools

Every major online TTS tool requires an account and imposes limits on free users. ElevenLabs, Murf, and PlayAI are all server-side services that cap free usage at 10,000–25,000 characters per month. SoundTools is different: our AI model runs entirely in your browser, which means there are no server costs to recover from users — and no need to limit usage. The key tradeoff is a one-time 100 MB download on your first visit. After that, it's cached and loads instantly. Browser-based TTS, no account, no upload, no limits, no watermark — that combination doesn't exist anywhere else at AI quality.

Text to Speech Quality Tips

To get the best results from AI text to speech, a few practices make a big difference. First, use proper punctuation — commas create natural pauses, periods signal sentence endings, and question marks change intonation. AI TTS reads punctuation cues, so a well-punctuated text sounds significantly more natural than one without. Second, write numbers as words when clarity matters: "twenty-five dollars" sounds better than "25 dollars" in most contexts. Third, spell out abbreviations like "e.g." as "for example" since TTS may pronounce abbreviations inconsistently. Fourth, if a technical term or proper noun is being mispronounced, try spelling it phonetically or adding a clarifying rewrite. Fifth, experiment with different voices — the same text can sound dramatically different depending on the voice, and sometimes an unexpected choice works better than the obvious one.

Frequently Asked Questions

Is this text to speech tool really free with no limits?

Yes. There are no character limits, no usage caps, no account requirements, and no watermarks. The AI model runs entirely in your browser, so there are no server costs that would require limiting usage. Generate as much audio as you want.

Does this upload my text to a server?

No. The AI voice model downloads to your browser on first use (~100 MB, cached for future visits) and all speech generation happens locally on your device. Your text never leaves your browser — fully private.

Why does it take a while to load the first time?

The Kokoro AI model is approximately 100 MB and downloads once on your first visit. After that, it's cached in your browser and loads instantly. The download progress is shown with a progress bar.

How many voices are available?

20+ AI voices: 11 American English female, 8 American English male, 4 British English female, and 4 British English male. Click the ▶ icon on any voice card to preview before selecting.

What audio formats can I download?

WAV (lossless, highest quality) and MP3 (smaller file size, 192 kbps quality). Both are watermark-free and download instantly after generation.

Can I convert a long document to speech?

Yes, there is no character limit. Long text is processed sentence by sentence — audio starts playing as each sentence is generated, even for very long texts. For extremely long documents (novel-length), expect generation to take several minutes.

Does this work on iPhone and Android?

Voice previews work on all devices and browsers. Speech generation currently requires a desktop browser — Chrome, Edge, or Firefox. Safari (desktop and iOS) doesn't yet support the threading features needed by the AI model. Since all iOS browsers use Apple's WebKit engine, this limitation applies to Chrome and Firefox on iPhone too. We're monitoring upstream fixes and will enable Safari/iOS support as soon as possible.

What is the Kokoro TTS model?

Kokoro is an open-source frontier TTS model with 82 million parameters, developed by hexgrad and licensed under Apache 2.0. Despite its compact size, it produces remarkably natural speech. It runs in browsers using ONNX Runtime Web — the same technology powering SoundTools' vocal remover and pitch shifter tools.

Can I use the audio commercially?

The Kokoro model uses Apache 2.0 license which permits commercial use. Review the full license for your specific use case. SoundTools does not place any additional restrictions on generated audio.

Why does generation speed vary?

Generation speed depends on your device's processing power. A full AI neural network (82 million parameters) runs directly on your device — this is computationally intensive work. On modern desktops, each sentence takes roughly 10–30 seconds to generate. On mobile or older devices, it may be slower. Audio plays sentence by sentence as it's generated, so you start hearing results quickly even for longer texts.

What's the difference between WAV and MP3 download?

WAV is lossless — perfect audio quality, larger file (about 3 MB per minute). MP3 is compressed at 192 kbps — excellent quality, much smaller file (about 1.4 MB per minute). For music and professional audio work, use WAV. For podcasts, videos, and casual use, MP3 is ideal.

How does speaking speed work?

The speed slider controls how fast the AI speaks: 0.5× is half speed (very slow, good for comprehension), 1.0× is natural pace, 1.5× is brisk, 2.0× is fast. Speed is applied during generation — it actually changes how the AI speaks, not just playback rate, so quality is maintained at all speeds.

Can I preview voices before generating?

Yes! Click the ▶ play icon on any voice card to hear a short preview. Voice previews play instantly — no model download required.

Does pitch shifting change the voice?

No — our Text to Speech tool generates the audio at the correct pitch for each voice. If you want to modify pitch after generation, download the WAV and use our Pitch Shifter tool.

What languages are supported?

Currently, this tool supports American English and British English. The Kokoro model supports additional languages including French, Japanese, Spanish, and Mandarin — we plan to add these in a future update.