Free Online Developer Tools

Fast, private, and free. All tools run entirely in your browser — no data is ever sent to a server.

Formatting

JSON Formatter & Validator

Format, validate, and beautify JSON

HTML Formatter

Beautify and indent HTML code

CSS Formatter / Minifier

Format or minify CSS stylesheets

Encoding

Base64 Encoder / Decoder

Encode and decode Base64 strings

URL Encoder / Decoder

Encode and decode URL components

Text

Regex Tester

Test and debug regular expressions

Markdown Previewer

Write and preview Markdown live

Word & Character Counter

Count words, characters, and more

Color

Color Code Converter

Convert HEX, RGB, HSL, and HSB colors

Date & Time

Unix Timestamp Converter

Convert Unix timestamps to dates