Prompt Variable Filler
100% PrivateAI & Prompt ToolsFill the {{variables}} in a reusable prompt template and get a finished, ready-to-send prompt.
Runs entirely in your browser. Your input is not uploaded to Ovatly or anywhere else.
- 1Paste a template that contains {{variables}} in double curly braces.
- 2Fill in the value field that appears for each detected variable.
- 3Check the unfilled list under the result; it should say nothing is left.
- 4Copy the completed prompt and use it in your AI tool.
Template: "Write a {{tone}} email to {{name}} about {{topic}}." Values: tone = friendly, name = Priya, topic = the project deadline. Result: "Write a friendly email to Priya about the project deadline." with 3 placeholders filled and none unfilled. If topic is left blank, the result keeps "{{topic}}" in place and lists topic as unfilled.
- Variable names may contain letters, numbers, spaces, hyphens and underscores; the same variable used twice is replaced in both places.
- An empty value counts as unfilled: the placeholder stays in the text so you can see exactly what is missing.
- Triple braces like {{{name}}} are treated as a literal brace around a normal {{name}} variable.
Anything wrapped in double curly braces, like {{customer_name}}. The tool lists each unique variable once, in the order it first appears.
About this tool
The Prompt Variable Filler turns a reusable prompt template into a finished prompt. Write the template once with placeholders like {{topic}} and {{name}}, and the tool detects every variable, gives you a field for each one, and substitutes your values everywhere the variable appears, including repeats. Any variable you leave blank stays visible in the output and is listed as unfilled, so a half-finished prompt never slips through unnoticed.
Related tools
Part of Ovatly's free tools in AI & Prompt Tools.