Convert text to speech using browser Web Speech API. Choose from multiple voices, adjust speed and pitch, and play audio directly.
Text-to-speech in the browser runs through the Web Speech API's SpeechSynthesis interface, which exposes whatever TTS engines your operating system provides. On macOS that means Apple's voices including the newer Siri voices; on Windows it is the Microsoft voices (legacy ones like Zira and David plus the newer neural voices like Aria); on Android it is typically the Google engine; on Linux it varies by distribution. Voice availability is not portable, a voice your users hear on Safari on Mac does not exist on Chrome on Windows, and this is the main reason TTS results feel inconsistent across devices. The quality gap between classic concatenative TTS and modern neural TTS is large. Older system voices sound robotic because they were built by splicing prerecorded phoneme samples; you can hear the joins. Neural voices (Apple's Siri voices, Microsoft's neural voices, Google's WaveNet-derived voices) synthesize speech from learned prosody models and sound close to human speech, including natural intonation on questions, emphasis on stressed syllables, and convincing pauses at punctuation. If the neural option is available, use it, the difference is not subtle.
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Transform voices with 9 effects: Chipmunk, Deep Voice, Robotic, Alien, Echo, Telephone, Monster, Whisper, and Helium. Includes pitch shift, filters, distortion, and modulation controls.
Trim, cut, and slice audio files with interactive waveform visualization. Drag handles to select portions, use keyboard shortcuts, zoom and pan, preview selection before export. Supports MP3, WAV, OGG, AAC.
Combine multiple audio files into one track. Drag and drop to reorder, merge MP3s, WAVs, and other formats. Create seamless audio compilations online.
Text-to-speech in the browser runs through the Web Speech API's SpeechSynthesis interface, which exposes whatever TTS engines your operating system provides. On macOS that means Apple's voices including the newer Siri voices; on Windows it is the Microsoft voices (legacy ones like Zira and David plus the newer neural voices like Aria); on Android it is typically the Google engine; on Linux it varies by distribution. Voice availability is not portable, a voice your users hear on Safari on Mac does not exist on Chrome on Windows, and this is the main reason TTS results feel inconsistent across devices. The quality gap between classic concatenative TTS and modern neural TTS is large. Older system voices sound robotic because they were built by splicing prerecorded phoneme samples; you can hear the joins. Neural voices (Apple's Siri voices, Microsoft's neural voices, Google's WaveNet-derived voices) synthesize speech from learned prosody models and sound close to human speech, including natural intonation on questions, emphasis on stressed syllables, and convincing pauses at punctuation. If the neural option is available, use it, the difference is not subtle.
Listen to your writing read back to catch errors your eyes skip over.
Generate a scratch narration track to test timing against a video before recording a real voice.
Hear how screen readers might handle your content.
The synthesis pipeline works in two stages under the hood: text normalization (expanding "Dr." to "doctor""1999" to "nineteen ninety-nine"handling abbreviations and numbers according to the target language) and waveform generation (producing the actual audio from the normalized text). Modern neural engines combine these into a single end-to-end model, which is why they handle edge cases better than older systems that treated normalization as separate rule-based preprocessing. Punctuation directly affects prosody: commas produce short pauses of roughly 200-300 ms, periods produce longer pauses of 400-500 ms with sentence-final falling pitch, and question marks produce rising pitch contours in the final phrase. Adding commas and periods where you want pacing is the main knob you have without leaving the browser API.
Speed and pitch controls scale the engine's output. Speed (the rate parameter) ranges 0.1x to 10x in the API but values outside 0.5x to 2x sound visibly artificial, natural speech falls in a narrow range around 150-180 words per minute, and pushing well outside that band reveals the synthesis algorithm. Pitch ranges 0 to 2 with 1 as the neutral default. Higher pitch makes voices sound younger or more excited; lower pitch sounds older or more serious. Both parameters work by post-processing the synthesized waveform, not by generating a different performance, which means extreme values can introduce audible artifacts as the time-stretching algorithm strains to keep voice quality intact.
Caveat on voice licensing: the voices exposed by SpeechSynthesis come from your OS, and their commercial usage rights vary by vendor. Apple, Microsoft, and Google generally permit personal use without restrictions but have specific terms for commercial products. For commercial voiceovers that need explicit licensing, dedicated TTS services (Azure Neural TTS, ElevenLabs, Play.ht) provide clear commercial terms and typically better voice quality than the free system voices. For drafting, previewing, proofreading, and accessibility testing, the built-in voices are sufficient and free.
Voice selection depends on your operating system and browser. Some OS/browser combinations offer more voices than others.
The voices are provided by your browser engine. Check the license terms of your OS speech synthesis system for commercial use rights.
All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.