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Calciyums

Developer

Developer utilities like JSON, Base64, UUID, timestamps and colours.

JSON FormatterFormat, minify and validate JSON, and see where the error is when it's invalid.
Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text, with full UTF-8 support.
UUID GeneratorGenerate random UUID v4 or time-ordered UUID v7 in one click.
JSON ValidatorCheck whether your JSON is valid and see what's wrong if it isn't.
Unix Timestamp ConverterConvert a Unix timestamp to a readable date and a date to a timestamp. Seconds and milliseconds are told apart automatically.
URL Encoder / DecoderTurn text into percent-encoding that is safe to use in a URL, or decode an encoded URL back to readable text.
Color ConverterConvert between HEX, RGB, HSL, HSV and CMYK colour codes, and see a preview and the contrast ratio.
Number Base ConverterConvert between binary, octal, decimal and hexadecimal number systems.
Hash GeneratorWork out a text's MD5, SHA-1, SHA-256 and SHA-512 hash instantly.
JWT DecoderShow a JWT's header and payload as readable JSON; the signature is not verified.
Subnet CalculatorFrom an IPv4 address and a CIDR prefix, work out the network address, broadcast address, subnet mask and usable host range.
Contrast Checker (WCAG)Work out the contrast ratio between two colours and see whether it passes WCAG AA and AAA.