Dev
Developer tools
23 entries
Developer utilities in one place. Everyday apps (timers, notepad) live under Apps.
Encoders & checkers
Encode, decode, and inspect strings and HTTP responses.
- Base64 Decoder & Encoder Encode and decode Base64 text and images. Learn how Base64 encoding works with text, data URIs, and HTML/CSS examples.
- URL Decoder & Encoder Encode and decode URLs with percent-encoding (%20, %3A, etc.). Reference table for common URL-encoded characters.
- 301 Redirect Code Generator Generate 301 permanent redirect code for PHP, ASP, ASP.NET, .htaccess, HTML meta refresh, and JavaScript.
- HTTP Status Checker Check HTTP status codes for any URL. Lookup table of common HTTP response codes: 200, 301, 302, 404, 500, and more.
- HTTP Header Checker Check HTTP response headers for any URL. View status codes, content-type, cache headers, and server information.
- HTML Editor - Online HTML Editor Free online HTML editor with live preview. Write HTML code and see rendered output instantly in your browser.
- SVG viewer & editor online View and edit SVG files online. Paste SVG code, preview the graphic, and modify vector elements in your browser.
- HTML Table Generator Generate HTML table code with CSS styling. Create rows, columns, headers, and borders with a visual table builder.
Color tools
Pickers, charts, schemes, and named colors.
- HTML Color Picker Free HTML color picker: drag the color map or use the hue slider to get HEX, RGB, HSL, and HSV codes for CSS and HTML. R
- RGB Color Codes Chart Interactive RGB color chart: set Red, Green, and Blue (0–255), pick from the chart, and copy HEX, rgb(), HSL, and 24-bit
- HTML Color Codes Browse 148 CSS named HTML color codes with HEX, RGB, and HSL. Search by name or hex, filter by family, and copy codes fo
- Color Wheel Chart Interactive color wheel: pick a base hue, choose complementary, analogous, triadic, and more harmonies, then copy HEX an
- Color Scheme Generator Generate harmonious color schemes from a base HEX: random, monochromatic, analogous, complementary, triadic, and more. L
- Color Checker Browse the classic 24-patch color checker chart with HEX and RGB, plus a WCAG contrast checker for text and background p
- Web color codes Web colors for HTML and CSS: browse the basic 16 names, jump to hue family shade pages, and convert #RGB shorthand to #R
- Red color codes Red color codes for #FF0000 — HEX, RGB, HSL, HSV, shades, named reds, and copy-ready CSS.
- Blue color codes Blue color codes for #0000FF — HEX, RGB, HSL, HSV, shades, named blues, and copy-ready CSS.
- Green color codes Green color codes for #008000 — HEX, RGB, HSL, HSV, shades, named greens, and copy-ready CSS.
Text & encoding
ASCII, Unicode, and text encoding references.