15 free tools, all running entirely in your browser.
Pretty-print JSON and catch syntax errors instantly.
Convert text to and from Base64, free — encode or decode instantly.
Percent-encode or decode URLs and query strings.
Inspect the header and payload of any JWT.
Generate RFC 4122 v4 UUIDs, one or in bulk.
Convert between epoch time and human-readable dates.
Test a regular expression against sample text and see every match.
Compare two blocks of text and see what changed, line by line.
Generate SHA-1, SHA-256, or SHA-512 hashes of any text.
Turn a cron expression into a plain-English description.
Pick a schedule and get the cron expression, no syntax memorization needed.
Generate a strong, random password with adjustable length and character sets.
Generate one or more random numbers within a range you set.
Convert special characters to HTML entities, or decode entities back to text.
Convert a JSON sample into a TypeScript interface, free — including nested objects and arrays.
Browse all 152 tools, or use the search box on the homepage to find a specific one.