Web developer tools

Convert colours between HEX, RGB, HSL, LAB, OKLab, and OKLCH.

Generate complementary, analogous, triadic, tetradic, and split harmonies.

Check WCAG contrast between foreground and background colours.

Generate an 11-step Tailwind-style colour scale from a base colour.

Generate themed colour palettes with deterministic seeds.

Simulate common colour-vision deficiencies for colours and images.

Crop an image to a social media aspect ratio.

Place a non-square image on a square or ratio matte.

Split a wide image into carousel tiles.

Composite a watermark onto images.

Generate multi-size favicons from a source image.

Optimise SVG markup and assets.

Split an image into a grid of tiles.

Convert images between common browser formats.

Add a colour noise overlay to artwork.

Remove image backgrounds with an ML model.

Trace raster images to SVG vectors.

Trim transparent edges from PNG assets.

Convert px to rem and rem to px with a configurable base size.

Compute named line-height ratios for a font size.

Convert pt, px, mm, em, rem, pc, in, and cm.

Count words, characters, sentences, paragraphs, and reading time.

Look up paper dimensions and pixel sizes.

Inspect Unicode codepoints, entities, and escape sequences.

Extract metadata from font files.

Analyse a PDF for print-readiness issues.

Impose images into folded-zine layouts.

Impose PDF pages for booklet, saddle-stitch, or n-up printing.

Generate a standards-grade browser-local QR code.

Generate standards-grade barcode SVG or PNG from text.

Generate HTML, Open Graph, and Twitter card metadata.

Test a regex pattern against pasted text.

Evaluate mathematical expressions with common functions.

Convert numbers between decimal, hex, octal, and binary.

Convert Unix timestamps and ISO dates, with simple date math.

Convert length, mass, volume, time, area, speed, pressure, energy, data, and temperature units.

Encode and decode Base64 and URL-safe strings.

Generate SHA digests for pasted text.

Transliterate English text to the Shavian alphabet.