AI Prompt Library Builder
A free, browser-based tool. Runs entirely in your browser — no sign up, nothing stored.
Add a prompt
Saved in this browser only (localStorage). Nothing is uploaded — clear your browser data and it’s gone, so export a backup.
Saved prompts (0)
How to use this calculator
- Add a prompt with a title, category and the prompt text.
- Copy any saved prompt with one click; delete ones you don't need.
- Export a .json backup, and import it on another device or after clearing your browser.
How it works
Your prompts are stored in this browser's localStorage and grouped by category. Nothing is sent to a server — which also means clearing your browser data deletes them, so keep an exported backup.
Export/import uses a simple JSON file you control, so your library is portable between devices without an account.
Frequently asked questions
Does this use AI or send my prompt anywhere?
No. It runs entirely in your browser using rule-based checks — your prompt is never uploaded or sent to any AI model. Still, avoid pasting passwords, API keys or private data into any tool.
Where are my prompts stored?
Only in this browser (localStorage). They aren't uploaded or synced. Export a .json backup to move them or keep them safe.
Will they survive clearing my browser?
No — clearing site data removes them. Export a backup first; you can re-import it any time.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.