Serynix topics
Useful tools and clear examples for everyday calculations, writing, and getting the details right.
Learn the difference between common barcode formats, how check digits work, and why a valid-looking barcode still needs a real scanner test.
Learn what to put in a QR code, how to make one for a link or contact, and how to check the finished code on a phone before using it.
Learn how image dimensions and aspect ratio work, when to fit or crop, and how to prepare an image for a page, profile or form without distorting it.
Compare PNG, JPEG, WebP and other common image formats, understand their tradeoffs, and choose an output that suits the image instead of just changing its extension.
