Developer Tools
Format, validate, and transform code and data directly in your browser. Developer-focused utilities for JSON, encoding, hashing, and more — all processing happens locally.
14 free toolsDeveloper Tools
JSON Formatter
Free online JSON formatter and validator. Paste raw JSON to beautify, minify, validate, and explore with a collapsible tree view. Instant results. No signup.
.*Regex Tester
Free online regex tester with live match highlighting, capture group display, and replace mode. Test JavaScript regular expressions instantly in your browser. No signup required.
#Hash Generator
Free online hash generator. Generate MD5, SHA-1, SHA-256, SHA-512, and SHA-3-256 hashes from text or files instantly in your browser. No signup. Nothing is sent to any server.
⏰Cron Generator
Free online cron expression generator and explainer. Build cron schedules visually or paste an expression to get a plain-English explanation with next run times. No signup required.
01Number Base Converter
Free online number base converter. Convert numbers between binary, octal, decimal, hexadecimal, and any custom base instantly. Includes bit visualization and step-by-step conversion explanation.
◑Contrast Checker
Free online WCAG contrast checker. Test foreground and background color combinations for AA and AAA accessibility compliance. Includes color picker, hex input, and live preview. No signup required.
🎨Color Palette Generator
Free online color palette generator. Create harmonious color schemes with complementary, analogous, triadic, and monochromatic modes. Export as CSS, Tailwind, JSON, SCSS, or PNG. No signup required.
⇄CSV to JSON
Free online CSV to JSON converter. Paste CSV or upload a file and instantly convert to formatted JSON. Also converts JSON back to CSV. Supports custom delimiters, headers, and data types. No signup.
↓Markdown to HTML
Free online Markdown editor with live HTML preview. Convert Markdown to clean HTML instantly. Supports GitHub Flavored Markdown, tables, task lists, and syntax highlighting. No signup required.
🔗URL Encoder / Decoder
Free online URL encoder and decoder. Encode special characters for use in URLs or decode percent-encoded strings instantly. Supports full URLs, individual components, and query strings.
🌐IP Address Lookup
Find your public IP address instantly. View geolocation, ISP, timezone, and network info for any IPv4 or IPv6 address. Free IP lookup tool. No signup required.
⚡Internet Speed Test
Free browser-based internet speed test. Measure download speed, upload speed, ping, and jitter. No app or plugin required. Works on any device with a modern browser.
01Binary to Text Converter
Free online binary to text converter. Convert binary code to readable text and text to binary instantly. Supports ASCII, UTF-8, spaces or no separators. No signup required.
📏Screen Ruler
Free online screen ruler. Measure anything on your screen in pixels, centimeters, or inches. Drag and resize — no install required.
Frequently Asked Questions
Are these developer tools free?▼
Yes, completely free. No subscription, no signup, no limits.
Is my code or data sent to a server?▼
No. All processing happens entirely in your browser using native JavaScript. Your data never leaves your device.
Do these tools work offline?▼
Once the page is loaded, most developer tools work without an internet connection since all processing is client-side.