Developer Tools
16 tools available
Format JSON, encode Base64, decode URLs, test regex patterns and more.
ASCII Table
Complete ASCII table showing decimal, hex, octal, binary, and character codes for all 128 values. Searchable, filterable, click to copy.
Base64 Encode/Decode
Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8 text with auto-detection and one-click copy.
Color Contrast Checker
Check color contrast ratios against WCAG 2.1 standards. See pass/fail results for AA and AAA levels with live preview and suggestions.
CSS Minifier & Beautifier
Minify CSS to reduce file size or beautify compressed CSS for readability. Shows original size, minified size, and savings percentage.
HTML Entity Encode/Decode
Convert special characters to HTML entities and back. Encode text for safe HTML embedding or decode entity references instantly.
HTML Prettifier & Minifier
Format messy HTML with proper indentation or minify it to reduce size. Supports 2-space, 4-space, and tab indentation options.
JSON Formatter & Validator
Format, minify, and validate JSON data online. Pretty-print with customizable indentation, syntax highlighting, and instant error detection.
JSON to CSV Converter
Convert JSON arrays to CSV format and back. Auto-detect columns, flatten nested objects, preview as a table, and download as a .csv file.
JWT Decoder
Decode JSON Web Tokens instantly in your browser. View header, payload, signature, expiration status, and claims without any server-side processing.
Markdown Preview
Write Markdown and see a live HTML preview side by side. Supports headers, lists, code blocks, links, bold, italic, and more.
PX to REM Converter
Convert between PX and REM units instantly. Configurable base font size, quick reference table, and bulk conversion for multiple values.
Regex Tester
Test regular expressions against text in real time. See highlighted matches, capture groups, and match details with common pattern presets.
Screen Resolution Checker
Check your screen resolution, viewport size, device pixel ratio, color depth, and orientation. Live-updating display with common resolution references.
URL Encode/Decode
Encode or decode URLs and query parameters online. Supports full URL encoding and component encoding with instant results.
XML to JSON Converter
Convert XML to JSON and back using the browser's built-in parser. Handles attributes, nested elements, and arrays of sibling elements.
YAML to JSON Converter
Convert between YAML and JSON formats instantly. Bidirectional conversion with a simple YAML parser built right into your browser.