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Explore All 77 ToolsTips, tutorials, and updates
Learn the formulas and worked examples behind percentages, tips, loan payments, BMI, date gaps and PayPal or Etsy fees, then check them with free calculators.
Learn what tokens are, how to estimate an LLM prompt's size and API cost with a simple formula, and how to trim and clean input text before you send it.
What happens to text and files you paste into online tools, how to redact secrets, strip photo metadata, check JWTs locally, and a pre-paste safety checklist.