"The Cloud HQ Extension of Google Chrome browser is very useful in turning Gmail into PDF. Normally, one can convert each Gmail, or any email, into a PDF file by  'Print' into PDF or 'Save as PDF'.  But when one needs to convert many Gmail messages into one large PDF document, there is no convenient way of doing it in a  batch except for printing each email at a time.  This could take many hours if one has hundreds of emails to print into PDF. Cloud HQ Extension of Google Chrome  browser makes the conversion of multiple Gmails into PDF very conveniently. I found it after I have spent money on two other commercial softwares and struggled with converting Google Takeout into PDF, all without success."

Export Gmail™ emails and labels to PDF with one click
Save emails or labels to PDF directly from Gmail™. 

This extension lets you easily save Gmail™ emails as a PDF document. Our service works in just 1 click, and you're done! 
Explore export emails to pdf ​& Save emails or labels to PDF directly from Gmail™. This extension lets you easily save Gmail™ emails as a PDF document. Our service works in just 1 click, and you're done! Export Gmail™ emails and labels to PDF with one click

With this extension you can: 
✔️ Merge multiple email messages into one PDF to send it to your lawyer 
✔️ Send all of your e-receipts, in 1 pdf to your accountant
✔️ Package all your email messages and then upload them into your CRM
✔️ Create a hard copy backup of your emails for your own records

Read More great reviews like:

Mathias GottschalkModified 
"I can save whatever email I want without any extra work so this has been awesome for me."

Julia GenenbacherModified 
"This was really helpful to me, no more screenshotting emails on my iphone."

Jean MilanModified 
"This has saved me countless amount of time - countless times. Love it"

Roxanne Duan
"The best feature to me is that CloudHQ Extension is that it is completely compatible with using a 'Label' (like an email storage folder for a subject) in Gmail.  
One can convert all emails in the 'Label'  into PDF in one click, i.e. one does not need to select the emails one-by-one, or page-by-page. This is very convenient 
for document production purposes.  In addition, as an option, the Gmail attachment can come imbedded in the PDF."