Developer Tools

JSON Formatter & Validator

Format, validate, and minify JSON with precise error messages.

Base64 Encode / Decode

UTF-8-safe Base64 encoding and decoding in the browser.

URL Encode / Decode

Percent-encode text for URLs, or decode %20s back to readable text.

UUID Generator

Cryptographically random UUID v4s, singly or in bulk.

Hash Generator (SHA-256, SHA-512, SHA-1)

SHA hashes of any text, computed locally with Web Crypto.

Password Generator

Strong random passwords from a cryptographic source — never sent anywhere.

Color Converter (HEX ⇄ RGB ⇄ HSL)

Convert colors between HEX, RGB, and HSL with a live swatch.

Unix Timestamp Converter

Epoch seconds/milliseconds to human dates and back — with live now.

Regex Tester

Test regular expressions live with match highlighting and flags.

JWT Decoder

Decode and inspect JWT header, payload, and expiry — locally.

CSV to JSON Converter

Convert CSV to JSON and JSON to CSV, both directions.

Diff Checker

Compare two texts and highlight added and removed lines.

HTML Encode / Decode

Escape HTML special characters, or decode entities back.

CSS Minifier

Strip comments and whitespace to shrink CSS.

JavaScript Minifier

Remove comments and blank lines from JavaScript.

HTML Minifier

Remove comments and whitespace between HTML tags.

SQL Formatter

Indent and line-break SQL for readability.

JSON String Escape / Unescape

Escape text for a JSON string, or unescape it back.

JSON to YAML Converter

Convert JSON into clean, readable YAML.

YAML to JSON Converter

Convert YAML config into JSON.

XML Formatter

Indent and pretty-print XML by tag depth.

Markdown to HTML Converter

Convert Markdown into clean HTML.

Number Base Converter

Convert between binary, octal, decimal, and hex.

CSS Gradient Generator

Design a linear gradient and copy the CSS.

CSS Box Shadow Generator

Dial in a box-shadow visually and copy the CSS.

Color Palette Generator

Generate shades, complementary, analogous, or triadic palettes.

Cron Expression Parser

Decode a cron schedule into plain English.

HTTP Status Codes Reference

Searchable reference of HTTP status codes and meanings.

MIME Types Lookup

Searchable reference of file extensions and MIME types.

IP Subnet Calculator

Calculate network address, broadcast, host range, and mask from CIDR.

Aspect Ratio Calculator

Simplify width:height to a ratio and scale dimensions proportionally.

CSS Specificity Calculator

Calculate the specificity of any CSS selector with a visual breakdown.

HTML to Markdown Converter

Convert HTML into clean Markdown — headings, lists, links, images, and code.

Markdown Previewer

Live side-by-side Markdown editor with instant preview.

Markdown Table Generator

Build Markdown tables visually with an editable grid and alignment options.