>_DevToolbox

Free Online Developer Tools

Fast, private, and free. Every tool runs entirely in your browser — your data never leaves your device.

Data

{ }

JSON Formatter

Format, validate, and beautify JSON data with syntax highlighting.

ID

UUID Generator

Generate random UUIDs (v4) instantly.

T

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Y/J

YAML/JSON Converter

Convert between YAML and JSON formats instantly.

Encoding

B64

Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to text.

%20

URL Encode/Decode

Encode or decode URL components and query strings.

&;

HTML Entity Encode/Decode

Encode special characters to HTML entities or decode them back.

Text

.*

Regex Tester

Test regular expressions with real-time matching and highlighting.

Aa

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words.

MD

Markdown Preview

Write Markdown and see a live HTML preview side by side.

+-

Diff Checker

Compare two texts and highlight the differences line by line.

Design

#C

Color Converter

Convert colors between HEX, RGB, and HSL formats.

🎨

Color Picker

Pick colors and generate palettes, harmonies, shades, and tints.

Security

#H

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.

JWT

JWT Decoder

Decode and inspect JSON Web Tokens — view header, payload, and expiration.

Code

CSS

CSS Minifier

Minify or beautify CSS code and see file size savings.

Privacy First

All tools process data directly in your browser using JavaScript. No data is ever sent to a server. No cookies, no tracking, no accounts required.