GluePuddingTool

Prompt Template Variable Editor

Paste a prompt template containing {{variable}} placeholders and the tool extracts every variable, builds a form for them, previews the filled-in result live and copies the final prompt in one click.

FreeOnline Tool
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How to Use

  1. Paste or type your template into the "Prompt template" box, using the {{variable}} format for placeholders; variable names may be in English or Chinese.
  2. The tool parses out every unique variable (repeats of the same name produce a single input, ordered by first appearance) and builds matching inputs in the "Fill in variables" area.
  3. Fill in a value for each variable and the "Preview" pane on the right substitutes them into the final prompt in real time.
  4. Press "Copy" to put the previewed result on your clipboard.
  5. Press "Load sample template" to see an example containing several variables.

Features

  • Automatically parses {{variable}} placeholders and extracts every unique name, deduplicated in order of first appearance.
  • Generates an input for each variable and updates the final prompt preview as you type.
  • Supports both English and Chinese variable names, and trims whitespace around the name.
  • Handles the edge cases: a template with no variables shows a "no variables" notice; a variable repeated several times only needs filling once and is replaced everywhere; an unclosed {{ or a stray }} raises a format error.
  • One-click copy of the finished prompt to the clipboard.
  • A "Load sample template" button for a quick trial.

Use Cases

Reusing team prompt templates
Freeze a proven prompt structure as a template so teammates only fill in the variable parts instead of rewriting it each time.
Producing prompt variants in bulk
Keep the same prompt skeleton and swap the role, topic or length variables repeatedly to produce variants for A/B comparison.
Prompt engineering iteration
While designing a system prompt or few-shot template, switch test data quickly through placeholders to see how the prompt behaves.
Teaching and documentation
Show visually how variables get substituted into the final text when writing prompt tutorials or internal documentation.

FAQ

What format must placeholders use?
Wrap the variable name in double curly braces, for example {{role}} or {{name}}. Whatever sits inside the braces is treated as the variable name, with leading and trailing spaces trimmed.
What if the same variable appears several times?
Only one input is created for it, and the value you type is substituted into every occurrence of that name in the template.
What happens if the template has no variables?
The variable area shows a "no variables" notice and the preview simply displays the template text unchanged.
What if my braces are not balanced?
The tool checks that the counts of {{ and }} match. When they do not, a format error appears under the template and no variable inputs are generated until you fix the template.