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Prompt Variable Template Builder

AI prompts & workflows · Done in 3 steps

Stays on your deviceFree · No sign-up
  1. 1Write your template
  2. 2
  3. 3
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About

Write a prompt with {{variables}}, get an auto-generated fill-in form, or batch-fill from CSV rows into dozens of prompts and export TXT, JSONL or CSV.

How to use it

  1. 1Write your prompt and wrap the parts that change in {{double_braces}}; add defaults like {{tone|friendly}}.
  2. 2Fill one: type values into the generated form and copy the finished prompt.
  3. 3Batch: upload or paste a CSV whose column names match your variables (download a CSV template to start).
  4. 4Check the column mapping, preview the prompts and export them as .txt, .jsonl or .csv.
You give
A prompt template with {{variables}}, plus values or a CSV file.
You get
Filled prompts — one, or one per CSV row — exportable as TXT, JSONL or CSV.
Good to know
Variable names use letters, numbers, underscores, dots and hyphens. Very large CSVs (tens of thousands of rows) may be slow; the preview shows the first 50 prompts but exports include all.
Privacy
Processed on your device. Nothing is uploaded, stored or logged.
Last tested
2026-10-28

FAQ

What is JSONL used for?

JSON Lines (one JSON object per line) is the format batch APIs and many evaluation tools accept. Each line here is {"id": n, "prompt": "…"}.

What happens if a CSV cell is empty?

The tool falls back to the value you typed in “Fill one”, then to the variable's default, and otherwise shows a [Variable name] placeholder so you can spot it.

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