Developer Tools
Free online tools for developers — format JSON, encode Base64, test regex, generate hashes and passwords. All client-side.
JSON Formatter
Format, validate and beautify JSON online. Free JSON formatter with indentation options and key sorting — runs entirely in your browser.
Base64 Encode/Decode
Encode text to Base64 or decode Base64 to text instantly. Free online Base64 converter — no upload, everything stays in your browser.
URL Encode/Decode
Encode or decode URLs and query strings online. Free URL encoder/decoder for percent-encoding special characters.
Password Generator
Generate strong, random passwords with custom length, uppercase, numbers and symbols. Secure client-side generation — nothing leaves your device.
Hash Generator
Generate SHA-256, SHA-384, SHA-512 and SHA-1 hashes from text using the Web Crypto API. Fast, free and fully client-side.
Regex Tester
Test regular expressions against sample text with live match highlighting, flags and capture groups. Free online regex tester.
JWT Decoder
Decode JWT tokens online — view the header, payload and expiry instantly. Fully client-side, your token never leaves the browser.
CSS Minifier & Beautifier
Minify CSS to shrink file size or beautify it into readable, indented code. Free online CSS formatter — instant and client-side.
HTML Entity Encoder
Encode special characters as HTML entities or decode entities back to text. Handles named, decimal and hex entities.
SQL Formatter
Format SQL queries with uppercase keywords and clean clause indentation. Free online SQL beautifier — runs in your browser.
YAML Formatter
Format and validate YAML, or convert between YAML and JSON. Free online YAML formatter for configs, pipelines and Kubernetes files.
Binary/Hex/Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal instantly — with support for huge integers and 0x/0b prefixes.
Cron Expression Generator
Build and understand cron expressions with instant plain-English descriptions and common presets. Free cron schedule generator.
Regex Generator
Get battle-tested regular expressions for emails, URLs, IPs, dates, passwords and more — with flags and anchoring options, ready to copy.
UUID Generator
Generate cryptographically random version 4 UUIDs — one or a thousand at a time, with uppercase and no-dash options. Free and instant.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back — auto-detects seconds vs milliseconds and shows local, UTC, ISO and relative time.