WhatsApp has rolled out a new tool called Sticker Maker which allows users to make their own custom stickers. Sticker Maker is available now on WhatsApp for Web and rolling out in the coming week on Desktop.
To use Sticker Maker, download the latest version of WhatsApp for Web or Desktop, from a chat window select the attachments icon (paperclip), then the Sticker icon, and from there you can upload a photo and make your own sticker.
WhatsApp lets you add an outline and crop the photo into a sticker. You can also add emoji, text, and additional WhatsApp stickers to your new sticker.