Can I use multiple variables?

Yes, you can use as many unique variables as you need in a single template.

Can I use multiple variables?

Yes, you can use as many unique variables as you need in a single template.

Prompt Template Builder

DevFormat Prompt Template Builder is a free, browser-based tool that build and save reusable system prompts for your AI agents. It runs entirely on your device with zero data transmission, making it safe for proprietary code and sensitive content.

🛡️ 100% Client-Side. Your data never leaves your browser.

Prompt Template (use {variable})

Variable Inputs

input_type

text

tone

Final Prompt OutputPREVIEW

Analyze the sentiment of the following customer feedback: The new feature is amazing! Provide the result in a professional tone.

Scaling AI Agents with Prompt Templates

The Power of Parameterized Prompts

Hardcoding prompts is a recipe for technical debt. Prompt templating allows you to separate the logic of your instructions from the dynamic data of your application. Using the standard {variable} syntax, you can build a library of reusable personas, instructions, and context markers.

Developing Robust AI Systems

By testing your templates with real-world inputs, you can identify where the model might struggle or where instructions need more clarity. This tool helps you quickly iterate on prompt engineering, ensuring your AI agents perform consistently across different user scenarios.

How to use

How to use Prompt Template Builder

1
Create your template using {curly_brackets} for variables.
2
Fill in the variable inputs that appear below the editor.
3
Preview the final composite prompt in real-time.
4
Copy the generated prompt to use in your LLM calls.

FAQ

Can I use multiple variables?: Yes, you can use as many unique variables as you need in a single template.