Developer Tools
Essential web developer utilities. Format and validate JSON or XML, minify JavaScript and CSS, encode Base64 strings, test regex, and compute secure hashes.
All Tools in Developer Tools (21)
JSON Formatter & Validator
Format, beautify, validate, and minify JSON data with line numbers and exact syntax error diagnostics.
CSS Minifier & Beautifier
Minify CSS stylesheets to reduce file size or beautify minified styles with clean indentation.
HTML Minifier & Beautifier
Compress HTML documents by removing comments and whitespace, or format unreadable code into neat tags.
JS Minifier & Beautifier
Format unreadable JavaScript code with proper spacing or strip spaces and comments for fast loading.
Base64 Encoder & Decoder
Encode text strings into Base64 format or decode Base64 data with full UTF-8 character support.
URL Encoder & Decoder
Encode special characters into percent-encoded query parameters or decode URL strings safely.
Regex Tester & Debugger
Test regular expressions with real-time match highlighting, regex flag toggles, and capture group breakdowns.
Markdown to HTML Converter
Convert Markdown syntax into sanitized HTML markup with live side-by-side preview and copy actions.
QR Code Generator (Dev)
Generate high-resolution QR codes with customizable colors, error correction levels, and SVG/PNG downloads.
Hash Generator (MD5 / SHA-256)
Calculate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-384, SHA-512) for text strings via Web Crypto API.
UUID / GUID Generator
Generate cryptographically random UUID v4 and v1 identifiers in bulk with uppercase, hyphen, and quote formats.
Color Code Converter (HEX/RGB/HSL)
Convert color codes between HEX, RGB, RGBA, HSL, HSLA, and CSS color names with a visual color picker.
CSV to JSON Converter
Convert CSV tables and spreadsheets into structured JSON arrays and objects with automatic type parsing.
XML Formatter & Beautifier
Beautify messy XML documents with structured tree indentation, syntax validation, or compact minification.
Cron Expression Generator & Parser
Build and explain standard 5-part and 6-part cron expressions with human-readable schedule descriptions.
.htaccess Redirect & Security Generator
Generate Apache .htaccess redirect rules (HTTP to HTTPS, www to non-www, custom 301s, and security headers).
Meta Tag Generator (SEO & Social)
Generate optimized HTML title tags, meta descriptions, Open Graph, and Twitter Card tags with live search preview.
Robots.txt Generator
Generate standard robots.txt crawler directives to control search engine indexing, disallow paths, and declare sitemaps.
Sitemap.xml Generator (Quick/Manual)
Create XML sitemaps from list of URLs with changefreq, priority, and lastmod tags for search engine submission.
Open Graph & Social Card Tag Generator
Design and preview Open Graph metadata for rich link previews across WhatsApp, Facebook, Twitter, and Discord.
Favicon.ico Converter (Multi-format)
Convert PNG, JPG, or SVG into real multi-resolution Windows .ico favicon files in your browser.
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Discover other high-performance in-browser utilities on FreeToolsBox.