Developer Tools
Free developer tools for code editing and debugging including JSON formatter, HTML viewer, and regex tester.
Developer tools are fastest when the input format is clear
The developer tools category collects helpers for JSON, HTML, CSS, JavaScript, hashing, encoding, regular expressions, and similar tasks that interrupt daily development. The goal is quick inspection, clean output, and fewer manual formatting steps.
Keep a copy of the original input before transforming code or data. Whitespace, encoding, escaping, and syntax rules can matter, so production changes should still go through your normal tests and review process.
23 tools
Common uses
- Format or minify JSON, HTML, CSS, and JavaScript.
- Check hashes, encodings, decoded values, and regex results.
- Clean output before pasting into code or documentation.
- Test a small sample before changing a larger file.
Quick checks
Can I paste the output directly into production code?
Use it as a helper result, then run your project tests and review before release.
Can these tools handle large files?
Browser performance and each tool limit can vary. Try a smaller sample first for very large input.
Should I enter secrets or tokens?
Avoid entering sensitive credentials. Use placeholder values when you only need to test structure.
Tools
23 toolsBinary Calculator
Calculate binary values with arithmetic or bitwise operations, then inspect binary, decimal, hexadecimal, popcount, and...
Color Contrast Checker
WCAG 2.1 compliant contrast ratio measurement tool. Real-time calculation of text and background color contrast...
Color Picker
Professional color picker with color wheel, saturation/brightness controls, HEX/RGB/HSL formats, EyeDropper API, harmony colors, and...
CSS Beautifier
Format minified CSS code into readable format. Real-time conversion, indent options, copy and download support.
CSS Minifier
Remove unnecessary whitespace, comments, and line breaks from CSS code to reduce file size. Improve...
CSV ↔ JSON Converter
Online CSV ↔ JSON converter. Control headers, delimiters, and empty/null rules, review errors and previews,...
CSV Header Extractor
Extract CSV header rows, review delimiter detection plus duplicate or empty column cleanup, and copy...
Hash Generator
Free online hash generator supporting MD5, SHA-1, SHA-256, and SHA-512 algorithms. Enter text and get...
Hash Identifier
Automatically identify the algorithm type of a hash value. Supports 30+ hash formats including MD5,...
Hex Calculator
Calculate two hexadecimal values and review arithmetic or bitwise results in hex, decimal, octal, binary,...
HTML Beautifier
Format minified HTML code for readability. Real-time formatting with indentation options, copy and download support.
HTML Entity Converter
Convert HTML special characters (, &, " etc.) to entity codes, or decode entities back...
HTML Minifier
Remove unnecessary whitespace, line breaks, and comments from HTML code. Supports real-time minification with compression...
HTML Viewer
HTML Viewer helps you format and validate code data with clear input guidance, practical examples,...
JS Beautifier
Format minified JavaScript code into readable format. Supports indent options and real-time conversion.
JS Minifier
Reduce JavaScript file size by removing unnecessary whitespace, line breaks, and comments. Features compression rate...
JSON Formatter
Format, minify, validate, and inspect JSON data in your browser with copy, download, and error...
JWT Decoder
Instantly decode JWT tokens and inspect headers, payloads, and signatures. Provides HMAC signature verification, expiration...
Markdown to HTML Converter
Convert Markdown to HTML in real-time. Full GFM support, syntax highlighting, and preview.
Regex Tester
Test regex patterns in real-time with match highlighting, group display, and pattern explanation.
SQL Formatter
Format messy SQL queries into readable code with proper indentation. Supports 8 major databases including...
UTF-8/UTF-16 Byte Calculator
Compare UTF-8 and UTF-16 byte size with optional BOM handling, then inspect chart, summary table,...
YAML ↔ JSON Converter
YAML ↔ JSON Converter helps you format and validate code data with clear input guidance,...