Use WhatsApp’s built-in text formatting
Type your message in the chat box
Put text between asterisks for bold: `*text*`
Put text between underscores for italics: `_text_`
Put text between tildes for strikethrough: `~text~`
Put text between triple backticks for monospace: “`text“`
Combine formats if needed, such as `*_text_*`
Send the message after formatting
Use a font generator website in your browser if you want different stylish fonts
Copy the generated text
Paste it into WhatsApp
Send the pasted text without installing any app