Practical browser-based utilities for everyday developer tasks — test regex patterns, compare text diffs, generate UUIDs, decode JWTs, convert timestamps, format code, and more. No installation required.
Test regular expressions against sample text with live match highlighting.
Compare two blocks of text and highlight the differences.
Beautify, minify, and validate JSON with syntax highlighting.
Decode and inspect JSON Web Token header, payload, and signature.
Generate one or many UUIDs (v4) instantly.
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text.
Convert Unix timestamps to human-readable dates and vice versa.
Encode text as a Base64 string.
Decode a Base64 string back to plain text.
Percent-encode URLs and query strings, or decode them.
Format messy CSS or minify it for production.
Format and beautify JavaScript code with Prettier.
Format, beautify, and validate XML documents.
Format and beautify SQL queries for readability.
Minify HTML by removing whitespace, comments, and optional attributes.
Look up every HTTP status code with description and usage notes.
Look up MIME types by file extension or search by keyword.
Reference for escape sequences in major programming languages.
Calculate Unix file permissions using checkboxes and see the numeric value.
Parse and explain cron expressions in plain English.