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If you send from more than one address — a business alias, a second brand, a shared inbox — Gmail keeps a separate signature for each. Here is how that actually works, and why the wrong one keeps appearing.
Two different situations get confused constantly. Send-as aliases live inside one Gmail account: you add another address under Settings › Accounts and Import, and Gmail lets you choose which address a message comes from. Separate accounts are genuinely different logins that you switch between. The signature rules differ. Within one account, every send-as address holds its own signature, selected from the account dropdown directly above the signature editor — which is why editing a signature while the wrong address is selected appears to do nothing. Across separate accounts, nothing is shared at all: each login has its own settings, and a signature created in one is invisible to the other.
The general walkthrough is in adding a signature in Gmail.
Gmail picks a default send-as address, and in a reply it usually matches the address the mail was sent to. Check the From field before sending — the signature follows the address, not your intention.
The single most common cause. The selector sits above the defaults and is easy to scroll past.
Each address has its own new-mail and replies defaults. Setting one does not set the other.
Separate logins share nothing. Confirm which account the browser tab is actually in.
The Gmail mobile app keeps a single plain-text signature that overrides the web one — see changing your Gmail signature.
Mail sent on behalf of a shared inbox follows that mailbox's configuration, not your personal one.
Worth deciding deliberately. If your addresses represent one business — you@brand.com and hello@brand.com — keep the design identical and change only the address line; consistency is the point. If they represent genuinely different ventures, each should carry its own brand entirely, because a consulting signature under a photography enquiry confuses rather than cross-sells. And if one address is a shared or role inbox (support@, bookings@), its signature should name the team rather than an individual, so a handover does not require editing it. Teams running many addresses under one brand are better served by central deployment than by everyone hand-configuring aliases — see team deployment.
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Create my signature — freeYes. Every send-as address within a Gmail account keeps its own signature, chosen from the account dropdown above the signature defaults. Separate Google accounts share nothing at all.
Usually the from-address: the signature follows whichever address the message is sent from, and replies default to the address the mail arrived at. Also check that you edited under the correct entry in the account dropdown.
No — each alias has its own, and its own defaults for new mail versus replies. Configuring one leaves the others untouched.
You can create multiple named signatures and assign them per address and per context (new mail versus replies). The practical limit is organisational, not technical.
No. The mobile app keeps a single plain-text signature that overrides the rich web signature for anything sent from the phone, regardless of which address you use.