Gmail
How to install your Mysignature in Gmail on Android app
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Important: set your signature on Gmail Web, not in the app
The Gmail Android app does not have an HTML signature editor. Its built-in "Mobile Signature" field only accepts plain text. To get a fully formatted HTML signature on Android, you must set it on Gmail Web at gmail.com — it will then sync automatically to every device where you use that Gmail account, including Android.
Gmail Android compose window showing a formatted HTML signature synced from Gmail Web - 2
On a computer, open Gmail and go to Settings
Visit gmail.com in a desktop browser. Click the gear icon in the top right, then click "See all settings".
Gmail web with the gear icon and "See all settings" option highlighted - 3
Create a new signature
Under the General tab, scroll to the Signatures section. Click "Create new", give your signature a name, then click the HTML editor icon in the toolbar of the signature editor.
Gmail Settings General tab showing the Signatures section with the HTML editor icon - 4
Paste your signature HTML and save
Paste your copied Mysignature HTML into the editor, then click Save Changes at the bottom of the page. Set it as the default for new emails and replies. Your signature will now appear automatically when composing emails in the Gmail Android app.
Gmail Settings Signatures section with the HTML pasted and Save Changes button highlighted