Developer Tools
Free online developer utilities — JSON formatter, encoders, hash generators, JWT decoder, regex tester, and more
Encoding & Decoding
Base64 Encoder / Decoder
Encode any text or file to Base64 and decode Base64 strings back to plain text or binary.
URL Encoder / Decoder
Encode special characters for safe use in URLs, or decode percent-encoded URL strings instantly.
HTML Entities
Encode HTML special characters into entities, or decode HTML entities back to plain text for safe output.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases with full step-by-step output.
Formatting & Parsing
JSON Formatter
Validate, format, and minify JSON. Prettify messy JSON with syntax highlighting and error detection.
JSON Unescape & Cleaner
Remove backslashes and clean up escaped JSON. Handles stringified, double-escaped, and HTML-entity-encoded JSON.
JWT Decoder
Decode and inspect JWT tokens. View header, payload, and signature claims without a secret key.
Regex Tester
Write and test regular expressions with live match highlighting, group capture, and flag support.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports UTC and local timezones.
Cron Explainer
Paste any cron expression and get a plain-English explanation of when it runs, plus the next execution times.
Color Converter
Convert colours between HEX, RGB, RGBA, HSL, HSLA, and HSV formats with a live colour preview.
Security & Generation
Password Generator
Generate strong, secure random passwords with customisable length, character sets, and complexity rules.
UUID Generator
Generate cryptographically random UUID v4 identifiers. Generate one or bulk UUIDs for your projects.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes for any text. Compare hashes for file integrity checks.
Bcrypt Generator
Hash passwords using bcrypt with configurable cost factors. Verify bcrypt hashes against plain-text passwords.
Random String Generator
Generate random strings of any length using letters, numbers, symbols, or custom character sets.
Free Online Developer Tools
Our developer tools collection helps programmers work faster: encode/decode Base64, URLs, and HTML entities; format and validate JSON; decode JWTs; test regex; convert timestamps; convert number bases; generate passwords, UUIDs, hashes, and random strings; explain cron expressions; and convert colours — all free, in-browser, with no login required.
