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Free Developer Tools

Format JSON, test regex, generate passwords, build CSS, convert colors. Browser-based.

34 tools in this category

Meta Tag Preview

See how your website link looks when shared on WhatsApp, Facebook, and Twitter.

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API Response Mock Generator

Generate realistic fake API response data for testing. JSON format output.

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CSS Box Shadow Generator

Design beautiful box shadows visually. Adjust sliders and copy the CSS code.

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JSON to Code Converter

Paste JSON and get TypeScript interfaces, Python dataclasses, or Go structs.

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Open Graph Meta Generator

Generate OG meta tags for better social sharing previews on Facebook, Twitter, and WhatsApp.

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HTML to Markdown Converter

Convert HTML code to clean Markdown format instantly.

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Password Generator

Generate strong, secure passwords with custom length and character options.

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JSON Formatter Validator

Format, validate, and beautify JSON data. Collapse and expand nested objects.

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Base64 Encode

Encode text to Base64 format. Useful for data transmission and storage.

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Base64 Decode

Decode Base64 encoded strings back to readable text.

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HTML Minifier

Minify HTML code by removing whitespace and comments. Smaller file size for faster loading.

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HTML Beautifier

Format and beautify messy HTML code with proper indentation.

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CSS Beautifier

Format and beautify CSS code with proper indentation and line breaks.

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JavaScript Minifier

Minify JavaScript code. Remove comments and whitespace for production use.

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JavaScript Beautifier

Format and beautify minified or messy JavaScript code.

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URL Slug Generator

Convert any text to a URL-friendly slug. Perfect for blog posts and SEO.

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JSON to CSV Converter

Convert JSON data to CSV format for spreadsheets and data analysis.

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CSV to JSON Converter

Convert CSV data to JSON format for API integration and data processing.

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SQL Formatter

Format SQL queries with proper indentation and capitalization.

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Regex Tester

Test regular expressions in real-time with match highlighting.

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HTML Entity Encode Decode

Encode or decode HTML entities (special characters to & format).

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Color Code Converter

Convert colors between HEX, RGB, HSL, and CSS color names with live preview.

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Keyword Density Checker

Analyze keyword frequency and density in any text for SEO optimization.

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CSS Flexbox Generator

Visually create CSS flexbox layouts. Adjust properties and copy the code.

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CSS Grid Generator

Visually create CSS grid layouts. Customize columns, rows, and gaps.

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YAML Validator

Validate and format YAML configuration files.

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XML Validator

Validate and check XML document structure.

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JSON to YAML Converter

Convert JSON data to YAML format and vice versa.

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XML to JSON Converter

Convert XML data to JSON format easily.

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Markdown Editor

Write and preview Markdown in real-time with syntax highlighting.

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Hash Generator

Generate MD5 and SHA hash values for any text string.

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Unit Converter

Convert between units of length, weight, temperature, area, volume, and more.

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HTML Preview

Preview HTML code rendered as a webpage. See your HTML output instantly.

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Browser Info

Display your browser information — user agent, screen size, viewport, and more.

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About Free Developer Tools

Free online developer tools for frontend, backend, and full-stack engineers. Format and validate JSON, test regular expressions with real-time matching, generate cryptographically secure passwords, build CSS box-shadows and flexbox/grid layouts visually, convert color codes between HEX, RGB, and HSL, diff text files, and write markdown with live preview. All free, runs locally in your browser.

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