Calculators
JWT Decoder
Decode a JSON Web Token — inspect the header and payload without leaving the browser.
Base64
Encode text to Base64 or decode Base64 back to plaintext. Handles UTF-8.
JSON Formatter
Pretty-print or minify JSON. Catches syntax errors and shows where they occur.
Bayes' Rule
Compute the posterior probability P(A|B) given a prior, likelihood, and false positive rate.
Poker Equity
Texas Hold'em equity calculator. Enter hole cards and board, get win/tie/lose % via Monte Carlo simulation. Includes pot odds.