Developer tools / Generators
Luhn checker
Check whether a number passes the Luhn check (cards, IMEI).
Runs in your browser — your data stays on your deviceResult
More generators
QR code generatorQR codes for links, text, Wi-Fi, UPI payments and contacts. Download as SVG.
QR code readerRead a QR code from an image (uses your browser's barcode reader where available...
Barcode generator (Code 128)Code 128 barcodes as SVG.
Favicon generatorMake 16, 32, 48, 180, 192 and 512 px icons from one image, plus the HTML tags.
CSS gradient generatorLinear and radial gradients with live preview.
Box shadow generatorCSS box-shadow with live preview.
Border radius generatorCSS border-radius for each corner with live preview.
Flexbox playgroundTry flexbox settings and copy the CSS.