Developer Tools
Format JSON, encode Base64, test regex, and other dev utilities. All tools run locally in your browser.
Base64 Encode & Decode - Online Base64 Converter
Free online Base64 encoder and decoder. Convert text to Base64 and back instantly. Supports UTF-8 characters.
Chmod Calculator - Unix File Permission Calculator
Free chmod calculator. Convert between numeric and symbolic Unix permissions. Visual grid with 755, 644 presets.
Cron Expression Builder & Explainer
Free cron expression builder with human-readable explanations. Build cron schedules visually and see next run times.
HTML Entity Encoder & Decoder
Free online HTML entity encoder and decoder. Convert special characters to HTML entities and back. Prevent XSS and display HTML correctly.
HTML Table Generator - Visual Table Builder
Free HTML table generator. Create styled HTML tables visually, customize borders, colors and padding. Copy-ready code.
JSON Formatter & Validator - Pretty Print JSON Online
Free online JSON formatter and validator. Pretty print, minify, and validate JSON data instantly. Supports custom indentation.
JWT Decoder - Decode & Inspect JSON Web Tokens
Free JWT decoder. Decode and inspect JSON Web Tokens instantly. View header, payload, claims, and check expiration status.
Markdown Table Generator - Visual Table Builder
Free markdown table generator. Create markdown tables visually with custom columns, rows, and alignment. Copy-ready output.
Meta Tag Generator - SEO, Open Graph & Twitter Cards
Generate complete HTML meta tags for SEO, Open Graph, and Twitter Cards. Live Google search preview, character count validation, and one-click copy.
Regex Tester - Test Regular Expressions Online
Free online regex tester. Test and debug regular expressions with real-time highlighting, match details, and capture group support.
Robots.txt Generator - Block AI Crawlers & Configure SEO
Build a robots.txt file visually. Block AI crawlers like GPTBot and ClaudeBot, set crawl rules, add sitemaps, and configure Googlebot-specific directives.
SQL Formatter & Beautifier - Format SQL Online
Free online SQL formatter and beautifier. Pretty print SQL queries with syntax highlighting, configurable indentation, and keyword uppercasing.
SVG Optimizer - Minify SVG Code Online
Free SVG optimizer. Paste SVG code to remove comments, whitespace, and unnecessary attributes. See before and after size comparison.
URL Encode & Decode - Online URL Encoder/Decoder
Free online URL encoder and decoder. Encode special characters for URLs or decode percent-encoded strings instantly.
YAML Validator - Validate, Format & Convert YAML Online
Free YAML validator and formatter. Check syntax, find errors with line numbers, format YAML, and convert to JSON.