Mistaro Tools
Standalone online tools for developers, calculators, and day-to-day business tasks.
This is a collection of small, privacy-first utilities.
Each tool runs entirely in your browser. No data is sent to a server.
Developer Tools
- Slug generator Convert text to a URL-friendly slug.
- UUID generator Generate UUID v4, v7, Short UUID, and Nano ID.
- Cron expression builder Build and explain cron expressions. Preview next run times.
- WordPress salts generator Generate wp-config.php authentication keys and salts.
Text & Data Tools
- Text diff Compare two blocks of text and highlight differences.
- Unix timestamp converter Convert between Unix timestamps and readable dates. Supports seconds and milliseconds.
Finance & Calculators
- Percentage calculator Calculate percentages, reverse percentages, and percentage change.
- Invoice generator Create invoices with line items, totals, notes, and print-ready output.
- UK mortgage calculator Estimate monthly payments, overpayments, and payoff date.
About this site
Mistaro Tools is a simple directory of standalone HTML utilities. Each tool is focused on one task and loads quickly.
Everything runs client-side for privacy and offline use, with no tracking scripts or server-side processing.