AI Prompt Template Builder

An AI prompt template builder helps you create structured, reusable prompts with template variables, few-shot examples, and multi-message conversations. Instead of writing one-off prompts, you build templates with placeholders like {{language}} or {{topic}} that can be filled in for different use cases — making your prompts consistent, shareable, and easy to iterate on.

Effective AI prompts follow a structured pattern: a system message defining the AI's role and behavior, a user message with the specific task, and optionally few-shot examples (previous user/assistant message pairs) that demonstrate the desired output format. Managing this multi-message structure, especially with variable substitution, quickly becomes unwieldy in a plain text editor.

Our prompt template builder provides a visual editor for system prompts, user prompts, and additional messages with automatic variable detection. Define {{variables}} in any message, fill in their values in a dedicated panel, and see the resolved prompt in a live preview. Export to OpenAI JSON format, Anthropic JSON format, plain text, or a ready-to-run cURL command — all without leaving your browser.

1. Choose a preset or start blank — Select from built-in presets (Code Review, Translation, Summarization, Data Extraction) or start with an empty template.
2. Write your system prompt — Define the AI's role, behavior, and constraints. This sets the foundation for all interactions using this template.
3. Create the user prompt — Write the user message with {{variable_name}} placeholders for dynamic content. Variables are automatically detected and listed.
4. Add few-shot examples — Click "+ User Message" and "+ Assistant Message" to add example pairs that demonstrate the desired output format and quality.
5. Fill in variables — Enter values for each detected template variable to see how the resolved prompt looks in the live preview.
6. Export — Copy the prompt in OpenAI JSON, Anthropic JSON, plain text, or cURL format with one click.

• Template variables — Use {{variable_name}} syntax in any message. Variables are automatically detected across all fields and collected into a dedicated input panel.
• Four export formats — Export as OpenAI-compatible JSON (messages array), Anthropic-compatible JSON (with separate system field), plain text, or a complete cURL command ready to run.
• Few-shot example support — Add unlimited user/assistant message pairs to demonstrate desired behavior. Token counts shown per message help you manage context window usage.
• Built-in presets — Start with professionally structured templates for code review, translation, summarization, and data extraction — all with relevant template variables.
• Live preview with token counts — See the fully resolved prompt with variable substitution in real-time, with character and token counts for both individual messages and the total prompt.
• 100% client-side — Your prompts, variables, and exported content never leave your browser. No accounts, no server processing.

• Building reusable prompt libraries — Create standardized templates for common tasks (code review, writing, analysis) that team members can use with different variable values.
• API integration development — Build and test prompt structures, then export directly to OpenAI or Anthropic JSON format for use in your application code.
• Few-shot prompt engineering — Add example input/output pairs to guide model behavior, especially useful for tasks requiring specific output formats or domain knowledge.
• Quick API testing with cURL — Export your prompt as a cURL command to quickly test API calls from the terminal without writing code.
• Prompt documentation — Use the template variable system to clearly document which parts of a prompt are dynamic, making handoffs and code reviews easier.