Skip to main content
UFOZoo

Prompt Template Library: Manage & Reuse Your Prompts

Prompt template library online: store, organize, and reuse prompt templates with variable placeholders and export to JSON.

Updated 2026-08-16

Related Tools

System Prompt Generator: Build Role & Rules Prompts

Claude Prompt Generator: System Prompts & XML Examples

AI Prompt Compressor: Reduce Tokens & Save on LLM Costs

AI Video Prompt Generator: Prompt Builder for Text-to-Video

Midjourney Prompt Generator: Parameters & Styles Online

Prompt Injection Tester: Harden Your System Prompts

Features

  • Full template management: create, edit, delete, and duplicate prompt templates in a few clicks
  • Free-form category tags: organize templates into any categories you like, no preset lists
  • Instant search and filter: find templates by name, content, or category
  • {variable} placeholders: define {name} placeholders in any template and fill them per use
  • Unfilled variables kept as-is: a placeholder you skip stays visible in the output with a notice instead of silently disappearing
  • 10 built-in example templates: writing, code review, translation, support, data analysis, brainstorming, and more, ready to edit
  • Live rendering: the final prompt updates as you type values into the variable form
  • JSON export: download your whole library as a JSON file for backup or sharing
  • JSON import: paste template JSON to merge it into your library, with format validation and clear error feedback
  • Local storage: templates persist across visits via browser storage

How to Use

  1. 1Create a template: click New template, give it a name, optionally pick a category tag, and write the prompt content.
  2. 2Use {name} placeholders for parts that change every time, for example 'Summarize {article} in {language}'.
  3. 3Click Fill variables on any saved template and enter values for each placeholder; the rendered prompt updates live.
  4. 4Copy the rendered prompt with one click and send it to ChatGPT, Claude, or any AI tool.
  5. 5Build a team library: store the prompts your team uses every day in categories, then export the whole library as JSON to share.
  6. 6Reuse one template for many tasks: a single code-review template works for any codebase; just change the {code} variable.
  7. 7Back up regularly: click Export JSON to download your templates, since browser storage can be cleared.
  8. 8Move between devices: export JSON on one device and import it on another to keep your library in sync.
  9. 9Organize by category: tag templates with labels like Writing, Coding, or Business so a long list stays scannable.
  10. 10Duplicate and iterate: copy a template you like, then experiment on the copy without touching the original.
  11. 11Teaching scenario: a study tutor template with {subject} and {level} placeholders serves every subject; fill the variables per session.
  12. 12Search instead of scrolling: type a keyword or pick a category to narrow down a large library instantly.

Frequently Asked Questions

Where are my templates stored?

Templates are stored in your browser's localStorage, so they survive page refreshes and browser restarts. They are not uploaded anywhere. Note that clearing your browser data (cache/cookies/site data), or opening the tool in another browser or device, will erase them. Use Export JSON to back up important templates.

How do variables work?

Write {name} anywhere in a template's content, for example 'Summarize {article} in {language}'. When you switch to the Fill variables view, every placeholder appears as an input field; the rendered prompt updates live as you type. The same placeholder can appear multiple times and is filled everywhere at once.

What happens to variables I leave unfilled?

Unfilled placeholders are kept in the rendered output exactly as written (for example {topic}) so you never lose track of what is missing. A notice below the result lists which variables were left unfilled. This is intentional: the tool never silently removes parts of your prompt.

Can I import templates made by other people?

Yes. Click Import JSON, paste an exported template JSON (an array of template objects with id, name, and content fields), and click Import again. The tool validates the format first; malformed JSON or invalid items are rejected with an error message, and nothing is merged. Templates whose id already exists in your library are skipped.

Which built-in templates are included?

Ten starter templates ship with the tool: Writing Assistant, Code Reviewer, Translator, Customer Support Reply, Data Analyst, Brainstorming Partner, Email Polisher, Study Tutor, Meeting Notes Summarizer, and Newsletter Writer. They are seeded into your library on the first visit and can be edited, duplicated, or deleted like any other template.

How is this different from the System Prompt Generator?

The System Prompt Generator assembles a system prompt from a structured form (role, goals, constraints, output format). This template library is a storage and reuse tool: you keep any prompts you have written, organize them with categories, and fill {variable} placeholders before use. The two work well together: generate a prompt, save it as a template, then reuse it with different variables.

Can I customize the categories?

Yes. Categories are free-form tags: type any label you want on a template, such as Writing, Coding, Marketing, or a team name. The category filter chips in the sidebar are built automatically from the labels currently used in your library.

Will my templates sync across devices?

No. localStorage is tied to one browser on one device, so templates do not sync automatically. To move or back up your library, export it as JSON and import it on the other device.

What if I delete a template by accident?

Deletion asks for confirmation first. After a template is deleted it is gone from the library, so if the library contains something you might want back, export a JSON backup first. Duplicating a template before heavy edits is a good habit for the same reason.

Can I reuse one template with different values?

Yes, that is the main use case. Fill the variables with one set of values, copy the result, then fill them with another set and copy again. The stored template itself never changes; only the rendered output does.

Do variable names support Chinese or other languages?

Yes. Any text between the braces works as a placeholder name: Chinese, English, digits, or a mix. For example {主题} works exactly like {topic}.

What happens if localStorage is full or unavailable?

If the browser blocks storage (private mode, quota exceeded, or storage disabled), the tool keeps working in memory for the current session; templates are just not persisted. Export JSON to save your work manually in that case.

Can I use these templates with LangChain or in Python?

The {variable} syntax works like Python's str.format, so each template ports to a LangChain PromptTemplate with minimal changes: replace {name} with the same variable names you pass as input_variables. Export your library as JSON first; the id/name/content fields map directly to template records. This is a management and reuse tool, not a LangChain plugin, but the exported templates drop into most Python prompt tooling cleanly.

How do I build a prompt library for video or image generation prompts?

Create one template per style or shot type and use placeholders for what changes: e.g., '{subject} in {style} style, {camera} angle, {lighting} lighting'. Keep the style keywords that never change inside the template body and only fill the variables per generation. The same library handles text, image, and video prompts; categories like 'Video' or 'Image' keep them separate.

Why not just use Notion or a notes app for my prompt library?

You can use Notion: it is great for sharing and presenting templates as documents. What it does not do is treat a prompt as a runnable artifact: no {variable} filling with live rendering, no JSON import/export that maps cleanly to LangChain PromptTemplates, and searching inside code blocks is clunkier. This tool is a focused prompt store: variables, categories, instant search, and backup/portability in one JSON file. Use Notion when you need team-facing documentation; use this when you need to actually fill and reuse prompts fast.