Quick Answer
Open Gmail on a desktop browser, click the gear icon in the top right corner, choose See all settings, scroll to the Signature block on the General tab, click Create new, give your signature a name, type or paste the content into the rich text editor, set the Signature defaults dropdowns for both new emails and replies, then click Save Changes at the bottom of the page.
The signature applies automatically to every outbound message once defaults are set. You can store multiple signatures and switch between them per email.
Why a Good Signature Matters
An email signature is your digital business card. A clean signature reinforces your name and role, gives recipients a one-click path to your website or phone, and keeps your branding consistent across every reply thread. A bloated one full of huge images, marketing banners, and three quotes makes you look like spam.
Setup Configuration Flow
| Step | Path |
|---|---|
| Open settings | Gear icon, See all settings |
| Find signature block | General tab, scroll to Signature |
| Create new signature | Click Create new, name it |
| Format content | Use the rich text editor |
| Configure defaults | Select signature for new emails and replies |
| Save | Click Save Changes at the bottom |
Step 1: Access See All Settings
Open Gmail in your browser. Click the small gear icon in the upper right corner; a Quick Settings sidebar slides out. Click the See all settings button at the top of that sidebar to open the full configuration panel.
Step 2: Create a New Signature
You will land on the General tab by default. Scroll down until you see the Signature section. Click the Create new button. A small dialog appears asking you to name the signature (something descriptive like "Work Default" or "Sales Outreach"). Type the name and click Create.
An editing box appears on the right with rich text controls along the bottom: font, size, bold, italic, underline, text color, link, image, and alignment.
Step 3: Format the Content
Stick to a clean four-line layout for most professional signatures. Your full name in bold and slightly larger text. Your title and company on the second line, separated by a vertical bar. Your phone and email on the third. Your website link on the fourth.
Keep the typography simple. Use one font (Gmail's default Sans Serif is safest), one accent colour, and no more than two text sizes. Skip the inspirational quote unless it is genuinely part of your brand.
Image and Logo Best Practice
If you add a logo or headshot, prepare the file before uploading. Resize to 150 to 200 pixels wide at most, save as PNG with a transparent background, and keep the file under 50 kilobytes. Huge images render badly on mobile screens and trigger spam filters in some corporate inboxes.
Click the image icon in the editor toolbar, upload from your computer or paste a URL, then click the image once it inserts to choose small, medium, or large.
Step 4: Configure Signature Defaults
Directly under the editor you will see Signature defaults with two dropdowns: one for For New Emails Use and one for On Reply/Forward Use. Both default to No Signature, which is the most common reason a brand new signature fails to appear. Set both dropdowns to the signature you just created.
If you uncheck Insert signature before quoted text, Gmail places the signature after the entire reply chain rather than between your reply and the previous message. Most people prefer the box ticked so the signature follows their reply directly.
Step 5: Save and Test
Scroll to the bottom of the General tab and click Save Changes. Open a new compose window and you should see your signature populated automatically. Send a test message to yourself, open it on a phone, and confirm the formatting holds.
Switching Between Multiple Signatures
You can create as many signatures as you like (work, personal, side project) and switch between them from inside any compose window using the pen icon in the bottom toolbar. Click Insert signature and pick the one you want.
Mobile App Limitation
The Gmail mobile app stores its own simpler signature separate from the desktop version. Open the app, tap the menu, scroll to Settings, choose your account, then Mobile Signature. The mobile version supports plain text only, no images.
The Takeaway
Open See all settings, create a named signature, write a clean four-line layout, set the defaults dropdowns, and save. Five minutes of work gives every outbound message a polished, consistent sign off for the rest of your career.
