AI Prompt Builder
The AI Prompt Builder turns structured fields into a copy-ready prompt for ChatGPT, Claude, Gemini, and other assistants. It is template-based, runs locally, and includes token estimates.
Prompt fields
Few-shot examples
Self-check rules
Quick templates
How it works
This utility runs as static HTML, CSS, and vanilla JavaScript. Shared model metadata is bundled in a local browser data file, pricing-aware math is calculated locally, and controls work without sending data to any API.
Pricing changes frequently. Last updated: April 27, 2026. Verify against official vendor pricing pages before relying on estimates.
Frequently asked questions
Why use a structured prompt?
A structured prompt separates role, task, context, constraints, examples, and output format. This reduces ambiguity and improves reviewability.
What is XML-tag style?
XML-tag style wraps sections in tags such as <role> and <task>. Claude-style prompts often benefit from clear boundaries.
Should I always include examples?
Examples help when format or style matters, but they consume tokens. Use them for consistency-sensitive tasks.
How long should a system prompt be?
Long enough to define durable behavior, but not so long that it buries the current task. Keep core rules concise.
Does this tool send my prompt anywhere?
No. It is template-based and runs entirely in your browser.