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Developer Tools

JSON, Base64, hashes, JWT, regex, minifiers and encoders.

These free developer tools cover common coding tasks in the browser. Format and validate JSON, convert JSON to CSV, encode and decode Base64, URLs and HTML entities, and generate MD5 and SHA-256 hashes. Decode JWTs, test regular expressions, convert Unix timestamps and number bases, and convert colours. Minify CSS, JavaScript and HTML, build CSS shadows, write Markdown with live preview, generate meta tags and look up HTTP status codes. Your data never leaves your device.

  • JSON Formatter & Validator — Beautify, minify and validate JSON with the exact error line and column, a collapsible tree view and key sorting.
  • JSON to CSV Converter — Convert a JSON array to CSV for Excel, or CSV back to JSON — handles quoted fields, commas and line breaks.
  • Base64 Encode & Decode — Encode text to Base64 or decode it back with full UTF-8 (Hindi, emoji) support, URL-safe mode and file ⇄ data URI conversion.
  • URL Encoder, Decoder & Parser — Percent-encode or decode URLs and query values, and break any URL into protocol, host, path and an editable query-parameter table.
  • HTML Entity Encoder & Decoder — Escape text for safe use in HTML (named or numeric entities) and decode &, ₹ and friends back to plain characters.
  • Hash Generator (MD5, SHA-256) — Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, HMAC-SHA256 with a secret key, and verify a checksum.
  • JWT Decoder — Decode a JSON Web Token to read its header and payload, with expiry dates in plain language.
  • Regex Tester — Test JavaScript regular expressions with live highlighting, capture groups, replace preview and Indian presets.
  • Unix Timestamp Converter — Convert Unix timestamps (seconds or milliseconds) to readable dates in IST, UTC and your time zone — and back.
  • Colour Converter & Contrast Checker — Convert colours between HEX, RGB, HSL, HSV and CMYK, check WCAG contrast and get tints and shades.
  • Markdown Editor & Preview — Write Markdown with a formatting toolbar and live preview, then download as .md or a styled .html page.
  • Code Minifier & Beautifier — Minify or beautify HTML, CSS and JavaScript safely — comments and whitespace removed, strings left untouched.
  • Number Base Converter — Convert numbers between binary, octal, decimal, hex and any base 2–36 — any size — plus a bitwise calculator.
  • CSS Generator — Visually build box-shadow, border-radius and glassmorphism CSS with a live preview, then copy the code.
  • Meta Tag Generator — Generate SEO, Open Graph and Twitter meta tags with length checks and a Google search preview.
  • HTTP Status Codes — Searchable reference of HTTP status codes — 200, 301, 404, 500 and more — explained in plain English.
  • What Is My Browser — See your browser, operating system, screen size, viewport, language, time zone and device capabilities.