Developer tools

Small utilities that run in your browser

Everyday developer tools with no sign-up and no server round trip. Whatever you paste in stays in your browser — none of it is transmitted, logged or stored.

Data

JSON Formatter & Validator

Format, validate and minify JSON.

UUID Generator

Generate RFC 4122 version 4 UUIDs.

Timestamp Converter

Convert between Unix timestamps and dates.

SQL Formatter

Format a SQL statement for readability.

Security

JWT Decoder

Inspect the header, payload and claims of a JWT.

Encoding

Base64 Encoder / Decoder

Encode and decode Base64, with UTF-8 support.

URL Encoder / Decoder

Percent-encode and decode URL components.

Text

Regex Tester

Test regular expressions against sample text.

Slug Generator

Turn a title into a URL-safe slug.

Frontend

Colour Converter

Convert between HEX, RGB and HSL.