Developer

33 free online Developer tools — fast, private and browser-based. No signup, no limits.

• UUID Generator — Generate one or multiple universally unique identifiers (UUIDs v4)
• Timestamp Converter — Convert Unix timestamps to human-readable dates and vice versa
• Base64 Encoder — Encode text or strings to Base64 format instantly
• Base64 Decoder — Decode Base64 encoded strings back to plain text
• Hash Generator — Generate SHA-1, SHA-256, SHA-384, SHA-512 cryptographic hashes
• Color Converter — Convert colors between HEX, RGB and HSL formats with live preview
• Number Base Converter — Convert numbers between binary, octal, decimal and hexadecimal
• Regex Tester — Test regular expressions with live match highlighting and group details
• Roman Numerals — Convert decimal numbers to Roman numerals and vice versa
• CSS Minifier — Minify CSS by removing comments, spaces and reducing file size
• JWT Decoder — Decode and inspect JSON Web Tokens — header, payload and expiry
• HTML Previewer — Write HTML and see a live rendered preview side by side
• Diff Checker — Compare two texts and highlight added, removed and unchanged lines
• URL Parser — Break down any URL into protocol, host, path, query params and hash
• Cron Explainer — Translate cron expressions into plain English and validate the syntax
• HTTP Status Codes — Complete searchable reference of all HTTP status codes with descriptions
• Meta Tag Generator — Generate HTML meta tags, Open Graph and Twitter Card tags
• HTML Beautifier — Format and indent HTML code for better readability
• SQL Formatter — Format, beautify and indent SQL queries with keyword capitalization
• .gitignore Generator — Generate .gitignore files for any tech stack by selecting project types
• Emoji Picker — Browse, search and copy emojis organized by category
• User-Agent Parser — Parse User-Agent strings to detect browser, OS and device type
• Markdown Table Generator — Build Markdown tables visually with a grid editor and alignment controls
• XML Formatter — Format and beautify XML with validation and configurable indentation
• CSV to JSON Converter — Convert CSV text to a JSON array with automatic header detection
• HTML to JSX Converter — Convert HTML to React JSX: className, htmlFor, self-closing tags and style objects
• CSS Specificity Calculator — Calculate CSS selector specificity scores with a-b-c breakdown
• chmod Calculator — Calculate Unix file permissions with octal notation and symbolic representation
• Open Graph Preview — Preview how your pages look when shared on social media with OG tags
• Favicon Generator — Generate a favicon from text or emoji with custom colors and download as PNG
• Color to CSS Variables — Convert hex colors to CSS custom properties with naming conventions
• .htpasswd Generator — Generate .htpasswd entries with SHA1-based password hashing
• CORS Header Builder — Build CORS response headers with origin, methods, credentials and more

Text · JSON · Image · Math · Finance · Color · Utility · Security · Network · CSS · Data · Science · Time