Type text, pick from the voices installed on your own machine, and hear it spoken - with rate, pitch and volume sliders and a stop control. Uses the browser's built-in speechSynthesis API, so audio is generated on your device and nothing is uploaded. Imported Claude artifact. Source: https://github.com/simonw/tools (speech-synthesis.html, Apache-2.0).

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Details

PricingCompletely free

Security scanClean — skill and frontend scanned

Source simonw/tools

Created2026-08-25

Updated2026-08-25

View source prompt + release files — fork-enabled apps share their full source

System prompt (SKILL.md)

---
name: speech-synthesis
description: Type text, pick one of your system voices, and hear it spoken - with rate, pitch and volume controls.
metadata:
  tags:
    - artifact-import
    - media
  source_url: https://tools.simonwillison.net/speech-synthesis
  github_repo_url: https://github.com/simonw/tools
---

# Speech Synthesis Tester

An imported Claude artifact. Type or paste text, choose from the voices your
own operating system provides, set rate, pitch and volume, and press Speak.
Stop halts playback mid-sentence.

Useful for hearing how a phrase, a name or a script actually sounds, for
checking which voices a machine has installed, and for proofreading by ear.

It drives the browser's built-in speechSynthesis API, so the voices come from
your device rather than a server. Nothing is uploaded, no model is called, and
nothing is metered.

Release files (files)

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