You can send a PDF file from WhatsApp to Gmail by downloading the PDF using WhatsApp Web and then emailing it to your recipient as an attachment using Gmail.

In this article, I will show you how to use WhatsApp Web to send one or more PDF files to Gmail.
1 – Log In To WhatsApp Web
1 – Go to the WhatsApp Web homepage
2 – Next, on your mobile phone open WhatsApp.
3 – Within WhatsApp tap on the settings tab.
4 – On the settings page, tap on the linked devices option.
5 – On the linked devices page, click on the link a device button.
6 – Take your phone and point the camera to the QR code on the WhatsApp Web homepage to scan it and log in.
2 – Download The PDF Files From WhatsApp
1 – From the list of conversations on the left, locate the chat with the pdf files and click on it.
2 – Find the files that you would like to download within the conversation

3 – Once located click on the download icon to download the pdf file

3 – Email The Downloaded PDF Files From WhatsApp Using Gmail
1 – Open a new tab and go to your Gmail inbox.
2 – Log into your Gmail account.
3 – Click on the compose button to the left of the page.
4 – Enter your recipient’s email address, and then give the email a subject.
5 – Click on the attachment icon at the bottom of the compose box
6 – In the file explorer window, locate the pdf files you downloaded and select them.
7 – Click on the upload button after selecting the pdf files.
8 – Add a message to the email’s body and then click on the send button.