Images in Campaign Emails
WarmySender supports inserting images into your campaign emails using the Insert Image button in the email editor toolbar.
How to Insert an Image:
1. In the campaign email editor, click the Image icon (mountain/sun icon) in the toolbar.
2. Paste the URL of your image (must be a publicly accessible HTTPS URL).
3. Optionally add alt text (recommended for accessibility and email clients that block images).
4. Optionally set a width (e.g. 600 for full-width, 300 for half-width).
5. Click 'Insert Image' — the image appears inline in your email.
You can also insert images in code view by typing an <img> tag directly, for example:
<img src="https://yoursite.com/image.png" alt="Description" width="600" />
Where to Host Your Images:
Images must be hosted on a publicly accessible URL. You do not upload images to WarmySender — instead, host them on your own website, a CDN, or a free image hosting service:
• Your company website or CDN (best option for brand consistency and reliability)
• Google Drive (set sharing to 'Anyone with the link', then use the direct link)
• imgbb.com (free, no account required)
• Imgur (free for public images)
• Any web server that serves images over HTTPS
Image Best Practices for Cold Email:
- Keep images under 100KB — large images slow loading and may trigger spam filters.
- Use HTTPS URLs — many email clients block HTTP images or show security warnings.
- Maximum width: 600px — email clients render at 600-640px max width. Use width="600" for full-width images.
- Use JPEG for photos, PNG for logos/graphics with transparency.
- Avoid WebP — Outlook desktop does not support it.
- Always add alt text — many email clients block images by default. Alt text shows when images are blocked.
- Avoid GIFs in cold outreach — they increase email size and can hurt deliverability.
Deliverability Considerations:
- Maintain an 80/20 text-to-image ratio — emails that are mostly images trigger spam filters.
- Avoid images in the first email of a cold sequence — text-only first emails perform best for deliverability.
- Limit to 1-2 images per email — each image is an external resource request that spam filters track.
- Never send image-only emails — always include substantial text content alongside images.
- A small logo in your email signature is generally safe and does not significantly impact deliverability.
Common Use Cases:
- Company logo in email signature
- Product screenshots in follow-up emails
- Infographics or charts (after initial engagement)
- Banner images for event invitations
Note: WarmySender does not support file attachments (PDFs, documents, etc.) in campaign emails. See the 'Email Attachments in Campaigns' guide for alternatives.