Merge to Envelopes
How do I mail merge to envelopes?
From the Google Docs Add-on Only
In Google Docs, click Add-ons > Mail Merge > Envelopes.
Select a standard envelope size from the Envelope Size drop-down (A), or set your own custom width and height (B).
Click Save to apply changes.
Open the Mail Merge add-on by clicking Add-ons > Mail Merge > Start.
This will open the Mail Merge side bar.
Add a return address, if required.
Position your text centrally on the envelope using the ruler and the Enter key.
Insert your merge field into the template by selecting from the Merge Field drop-down and clicking Add.
Repeat for as many merge fields as required.
Select Letters under Merge To.
Click the Merge button.
Click the Print icon.
Click More Options and use the Paper Size drop-down to select your envelope size.
Click the Print button.