Prompt template playground
Write prompts with {{variables}}, fill them in and copy plain text or API-ready messages.
AIFreeRuns in your browser
The editor opens full screen. Your files stay in your browser.
Open prompt template playground- 01
Write a system and user prompt with {{variables}} where the content changes.
- 02
Fill in a value for each variable the tool detects.
- 03
Copy the result as plain text, Anthropic messages or OpenAI messages.
02
FAQ(3)
- Does it call a model?
- No. It builds the final prompt and request body so you can paste them into your own code or API client.
- What happens to a variable I leave empty?
- It stays as a {{placeholder}} in the output, and the tool lists which ones are still missing.
- Is my prompt stored?
- No. Everything stays in your browser tab and is gone when you close it.
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