Developer Toolbox
A collection of handy developer tools. Everything runs locally in your browser — no data is uploaded.
Encoding / Decoding
JSON Formatter
Free online JSON formatter, beautifier and minifier with instant syntax validation.
Base64 Encoder / Decoder
Free online Base64 encoding and decoding tool with full UTF-8 support.
URL Encoder / Decoder
Free online URL encoding (encodeURIComponent) and decoding tool for special characters in links.
Timestamp Converter
Convert between Unix timestamps and human-readable dates online, in seconds or milliseconds.
Generators
UUID Generator
Generate UUID v4 (universally unique identifiers) online in bulk, with uppercase option.
Password Generator
Generate strong random passwords online with custom length and character sets, all locally.
QR Code Generator
Generate QR codes from text or URLs online, download as PNG. Created locally for privacy.
Converters / Calculators
Color Converter
Convert between HEX, RGB and HSL color formats online with live color preview.
Radix Converter
Convert numbers between binary, octal, decimal and hexadecimal online, big numbers supported.
Hash Calculator (MD5/SHA)
Calculate MD5, SHA-1, SHA-256 and SHA-512 hashes of text online, computed locally.