Add image watermarks in Google Docs
Google has given the opportunity to put image watermarks. This gives more courage when sharing with other parties.
On every page of your document, this watermark picture will appear beneath the text. This is helpful for incorporating custom designs, branding, and corporate logos. When importing or exporting documents from Microsoft Word, picture watermarks are also maintained.
How to use it
Select “Insert” → select “Watermark” → upload the pic you want
Available to all Google Workspace customers, as well as G Suite Basic and Business customers.