To create a WhatsApp link that allows people to start a chat with you without saving your number, follow these steps:

1. Use the format:
   https://wa.me/<number>
   Replace <number> with your full phone number in international format, omitting any zeroes, brackets, dashes, or plus signs. For example, for a US number it would look like:
   https://wa.me/14155555555

2. To create a link with a pre-filled message that will appear automatically in the chat input box, use:
   https://wa.me/<number>?text=urlencodedtext
   Here, urlencodedtext is the message you want to pre-fill, URL-encoded (spaces replaced with %20, etc.). For example:
   https://wa.me/14155555555?text=I'm%20interested%20in%20your%20car%20for%20sale

3. If you want a link with just a pre-filled message but no specific number, use:
   https://wa.me/?text=urlencodedtext
   This will let the user choose the contact to send the message to after clicking the link

4. You can also generate WhatsApp links easily using free online tools like Walink or AlvoChat, where you enter your phone number and optional message, and the tool creates the link and a QR code for you

5. For WhatsApp Business users, you can create a short link directly within the app under Settings > Business Tools > Short Link, which you can share with customers

This method works on both mobile and desktop WhatsApp, including WhatsApp Web, making it easy to share your contact link on websites, social media, or other platforms