Pretty Print Gmail

Description

UPDATE: Because of Gmail changing the way it operates on the backend, there is no easy fix for multi-printing (where you select multiple emails from the main gmail window) not working. I'm going to have to unfortunately deprecate that feature.

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PrettyPrintGmail lets you print Gmail emails easily and prettily. Simply select all the emails you'd like to print, press the extension icon next to your address bar, and hey, presto! Your selected emails will get printed. Bonus: it removes the Google logo and other junk from the print view as well!
Only want to print a single email in a long thread? Simply click the down arrow near top-right of the email (next to the reply button), and select Print. Voila, prettified email.

IF YOU'RE TRYING TO PRINT MORE THAN ONE PAGE OF EMAILS: Because the extension doesn't have any access to your Gmail account, it can only print the emails currently being displayed on your screen. This means that if you want to print an entire label's worth of emails, you'll have to do that one page at a time. Note that Gmail lets you configure how many emails appear on the screen at one time up to a maximum of 100. Check this guide for more info on how to configure that: https://www.pcworld.com/article/228718/Gmail.html

Pressing the extension icon getting annoying? Try Alt+P. If that doesn't work, follow this guide to firmly set a shortcut for Pretty Print Gmail: https://www.howtogeek.com/127162/how-to-create-custom-keyboard-shortcuts-for-browser-actions-and-extensions-in-google-chrome/

PRETTY PRINT GMAIL FEATURES
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(DEPRECATED) MULTIPLE PRINTING: From the Gmail main page, select all the emails you want to print, and press the extension icon (printer button). You can also press Alt+P instead of pressing extension icon but if some thing else uses this shortcut then it won't have the intended effect.
Note that all of your emails will be compiled into one document. This takes time, so please be patient.

PERSONALIZE YOUR PRINTING: Right click extension icon and press Options. Now, select whether you'd like subject / from / to / date + time to be printed for your emails!

SINGLE THREAD PRINTING: Simply open an email thread, and press extension icon.

SINGLE EMAIL IN LONG THREAD PRINTING: Open the particular email you want to print, click the down arrow near top-right of the email (next to the reply button), and select Print. Voila, prettified email. Check screenshot #3 if this is confusing.

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FAQ:

Q. It's not working :(
A. Aww. Please send me an email!

Q. Wrong emails are being selected for printing :(
A. Refresh Gmail - Go to label/folder - Select emails and click the Pretty Print Gmail icon. It's possible that you selected other emails and that's confusing the extension. Starting from a clean slate will help.
Note that on the main Gmail page (i.e. the one you get when you first go to gmail.com, if you select emails in Primary tab and then switch to Forums tab without first unselecting the Primary tab emails, the Primary tab emails are also selected and printed. Simply switch back to the Primary tab and unselect the emails you don't want printed and try again.

Q. I can't find the extension icon! What do I click to print my emails?
A. If you can't find the extension icon (orange printer button) next to address bar, click on the three dots on the extreme right of address bar. A popup with a number of extension icons should show up. One of these (the orange printer one) will be PrettyPrintGmail. Right click on this and click 'Keep in Toolbar'.
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If extension icon is pressed outside of mail.google.com, it will simply navigate to mail.google.com.

Currently works for Mac, Windows, ChromeOS, and Linux. Note that this extension is meant for Gmail only. It does not work for Inbox (by Google), but if you use Inbox there's already an easy way to print emails - click the Print button.

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Icon credits: Plainicon from www.flaticon.com.