Voice Settings Guide
Controls speaking speed. 1x is normal conversation pace. Slower rates improve comprehension for learners.
Adjusts voice frequency. Lower pitch sounds deeper, higher pitch sounds lighter. 1 is the natural baseline.
Controls output loudness. 0 is silent, 1 is maximum. Useful for background listening without adjusting system volume.
Supported Languages
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News Article
Poetry
Documentation
What is Text to Speech?
Text to Speech (TTS) is a technology that converts written text into natural-sounding spoken audio. Instead of reading text on your screen, you can listen to content read aloud by a synthesized voice. The technology has evolved dramatically from early monotone robotic voices to today's near-human-quality speech, powered by advances in deep neural networks and natural language processing.
TTS is used extensively across many domains: from accessibility for visually impaired users, audiobook generation, GPS navigation systems, and virtual assistants (Siri, Google Assistant, Alexa), to proofreading written content by ear. This tool uses the Web Speech API built into your browser, works entirely offline with system voices, and guarantees complete privacy since no data ever leaves your device.
How Browser TTS Works
The Web Speech API is a standard web API that allows developers to integrate speech recognition and speech synthesis into web pages. The synthesis component (SpeechSynthesis) provides access to the voices installed on the user's device.
When you click Play, the tool creates a SpeechSynthesisUtterance object containing the text to be spoken along with parameters like voice, rate, pitch, and volume. This object is then passed to the speech synthesizer (speechSynthesis.speak()) for processing and audio playback through the device's speakers.
Available voices depend on your operating system and browser. Windows 11 provides numerous high-quality Microsoft voices, macOS offers Siri voices, while Chrome on any platform adds Google voices. The number and quality of voices vary significantly across platforms.
The major advantage of Web Speech API over cloud-based TTS services is fully local processing: your text never leaves your device, no internet connection is needed for system voices, and there are no character limits or usage fees. The trade-off is that voice quality depends on the device's hardware and software capabilities.
Choosing the Right Voice and Settings
Selecting the appropriate voice depends on your use case and intended audience:
- Proofreading: Choose a slow rate (0.8x) to hear each word clearly. Natural-sounding voices help catch grammar and phrasing errors that are easy to miss when reading visually.
- Long-form listening: Rate of 1.0x-1.2x with a clear voice. Moderate pitch settings prevent ear fatigue during extended listening sessions.
- Language learning: Select a native voice for the target language, slow rate of 0.7x-0.8x for clear pronunciation practice.
- Presentation rehearsal: Rate of 0.9x-1.0x, professional-sounding voice, full volume to evaluate the pace and rhythm of your delivery.
Expert tip: Experiment with different voices before settling on one. The default voice is not always the best option. On Chrome, you can install additional language packs in your operating system settings to unlock more high-quality voices.
Text to Speech for Accessibility
TTS plays a crucial role in making web content accessible to everyone. According to the World Health Organization (WHO), an estimated 2.2 billion people worldwide have some form of vision impairment. For these individuals, TTS is an essential tool for accessing online information.
Beyond visually impaired users, TTS also supports people with reading difficulties (dyslexia), elderly users with declining vision, and anyone who wants to multitask — listening to articles while cooking, exercising, or driving. The read-aloud feature also helps children learning to read by connecting the visual form of words with their corresponding sounds.
Web accessibility standards like WCAG 2.1 encourage providing alternative modes for text content. Integrating TTS into your website is an important step toward Level AA compliance, ensuring your site serves a wider range of users.
TTS in Different Languages
One of the strengths of the Web Speech API is multilingual support. Depending on your browser and operating system, you can access voices in dozens of languages including English, Vietnamese, Japanese, Korean, Chinese, French, German, Spanish, and many more.
TTS quality varies significantly between languages. English typically has the most high-quality voices available, while less common languages may only have one or two basic options. Vietnamese support has been steadily improving, especially on Windows 11 and Chrome with Google voices.
When using TTS for multilingual content, make sure to select a voice that matches the language of your text. Using an English voice to read Vietnamese text will produce incorrect results because the system will apply the wrong pronunciation rules. See also: Word Counter to check text length before playback, or Case Converter to prepare your text.
Frequently Asked Questions
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About Text Tools
Text tools handle the daily grind of working with strings, paragraphs, and documents: counting words, reversing characters, transforming case, generating slugs, splitting long text, previewing Markdown. These replace separate desktop apps and complex CLI commands with a single URL you can bookmark and use without setup.
Why it matters
Writers, editors, and content teams work with text constraints everywhere — Twitter's 280-char limit, LinkedIn's 1,300-char optimal post, academic abstracts of 250 words, SEO meta descriptions capped at 155. A word counter that shows characters (with and without spaces), words, sentences, paragraphs, and reading time lets you hit platform specs without switching between tools.
Privacy and safety
Text tools process input entirely in your browser. Your blog draft, legal contract, or confidential email never leaves your device. Even the word counter doesn't transmit your text — it runs a simple counting function locally, which is actually all that's needed. If a text tool claims to 'process' your text on their server, the scope for data leakage is enormous and almost never justified.
Best practices
- For SEO titles, aim for 50-60 characters including spaces (Google truncates longer titles)
- Meta descriptions work best at 150-155 characters — Google has been showing ~160 on desktop, ~120 on mobile
- When generating slugs, keep them short (3-5 words), all lowercase, hyphens-not-underscores, avoid stop words
- Markdown preview is useful BEFORE publishing to verify headings, links, and lists render correctly on the target platform