Web Dev Tools
Free online tools to help web developers optimize performance and streamline workflows.
Color Converter
Convert a colour between HEX, RGB, HSL, HSV and CMYK right in your browser, then copy any format or explore tints, shades and harmonies.
Hex to RGB Converter
Convert a HEX colour code to RGB values instantly in your browser. Paste any hex string and read off the red, green and blue channels.
RGB to Hex Converter
Convert RGB values to a HEX colour code instantly in your browser. Type red, green and blue numbers and copy the six-digit hex string.
Hex to HSL Converter
Convert a HEX colour code to HSL — hue, saturation and lightness — instantly in your browser. Paste a hex string and copy the hsl() value.
RGB to HSL Converter
Convert RGB values to HSL — hue, saturation and lightness — instantly in your browser. Type red, green and blue numbers and copy the result.
Contrast Checker
Check text and background colours against WCAG AA and AAA contrast ratios in your browser. See the ratio, pass or fail, and a live text preview.
URL Encoder
Encode text into a URL-safe string in your browser — component, full URI, or form encoding. Nothing you type is uploaded.
URL Decoder
Decode a percent-encoded URL or query string in your browser and see each key and value from the query, all without leaving the page.
UUID Generator
Generate UUID v4, UUID v7, ULID, or Nano ID identifiers in your browser, in bulk, with uppercase, hyphen, and brace formatting options.
CSS Sprite Generator
Free online CSS sprite generator. Upload images, arrange into sprite sheet, generate CSS code with retina @2x/@3x support. 100% client-side.
Favicon Generator
Generate a complete favicon package: favicon.ico, apple-touch-icon, Android Chrome PNGs, PWA maskable icons & site.webmanifest. Free, no signup.
Regex Tester
Test regular expressions live in your browser on Rust's linear-time engine. Match highlighting, groups, replace, lists and explanations. Nothing is uploaded.
Base64 Encoder / Decoder
Encode or decode Base64 in your browser: paste text, or drop a file too big to paste. URL-safe alphabet, padding and data URI options. Nothing is uploaded.
Hex Encoder / Decoder
Convert text and files to hex, or hex back to bytes, in your browser. Reads hexdumps, C arrays and 0x prefixes; writes any separator. Nothing is uploaded.
Cron Expression Parser
Parse a cron expression in your browser and read it in plain English, then preview its next run times in any time zone. Nothing is uploaded.
Subnet Calculator
Calculate a subnet's network, broadcast, and usable host range from an IPv4 or IPv6 CIDR block, right in your browser. Nothing is uploaded.