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Free tool · No signup · Runs in your browser
AI Banner Maker
Enter your domain — we pull your logo and colors. Pick a goal — we compose the banner. Download a PNG in standard email sizes.
1 · Brand
2 · Size
3 · Goal
4 · Message
5 · Extras
Transparent-safe · under 100 KB in most cases
Where does it go? The ProSignature editor has a built-in banner block — upload this PNG, add your link, and it ships under every email you send. Set it up free →
Email banner sizes that actually work
| Use | Size | Why |
|---|---|---|
| Signature banner | 600×200 | Matches standard 600 px email width; readable without dominating |
| Slim signature strip | 700×150 | Subtle, fits under long signatures |
| Newsletter header | 600×300 | Hero position at the top of a campaign |
| Promo card | 640×360 | In-body promotional block |
- Keep the file under ~100 KB — heavy images trigger clipping and slow loads.
- One message, one button. A banner with three CTAs is a banner with zero.
- Always link the image and set alt text — some clients block images by default.
- Don't make the whole email an image — spam filters and accessibility both suffer.
Frequently asked questions
What's the best size for a signature banner?
600×200 px, exported at 2× for retina. It matches the standard email content width.
Does it really use my brand colors?
Yes — enter your domain, and your site's logo and dominant colors are fetched and extracted right in your browser. Override anything manually.
How do I put it in my signature?
Download the PNG and use the banner block in the ProSignature editor (with a link URL), or insert it in Gmail/Outlook signature settings.
Is anything uploaded?
No — fetching, composing and export run entirely in your browser. Attached photos never leave your device.
A banner is one email. A signature is every email.
Logo, photo, social links, banner block, one-click Gmail install — free to start.
Create my email signature →