What Is the Image Library?
Your Knak account includes access to the Image Library, where you can upload and store images for use in emails and landing pages.
Each Knak contract includes a Content Delivery Network (CDN) hosting limit. This limit is measured in terabytes (TB). You can monitor your current usage by visiting CDN Usage.
How Image Hosting Impacts Your Account
Every time someone views an email or landing page that contains hosted images, those images are downloaded from Knak's servers. Each download contributes to your CDN hosting usage.
Your total usage depends on:
The number of times each image is downloaded
The file size of each image
The volume of emails or landing pages viewed
Large image files combined with high email volume can significantly increase hosting usage over time.
Monitor Your CDN Usage
You can monitor your current usage and projected usage from the CDN Usage page.
View Your Usage
Log in to your Knak account.
Review your total allowed hosting space and usage details.
The dashboard displays:
Your total CDN hosting limit (TB)
Your current usage
Your projected usage
Any projected overage costs, when applicable
If your account exceeds its hosting limit, or is projected to exceed it, contact your Customer Success Manager to discuss available options.
Reduce Your Hosting Usage
Optimize Image File Size
Smaller images reduce hosting usage. They also improve email loading speed.
Recommendation | Best Practice |
File size | Target under 100 KB. Avoid files larger than 300 KB for large images. |
Image dimensions | Upload images at approximately 2× the display width. Example: use a 1200 px image for a 600 px content area. |
Animated GIFs | Reduce frame count and image dimensions whenever possible. |
For additional guidance, see:
Use External Image Hosting
If you already host images outside of Knak, you can reference those images instead of storing them in the Knak Image Library.
Marketo Users
Use the Knak–Marketo Image Library Integration to store images directly in your Marketo instance.
Other Marketing Automation Platforms
Upload images to your marketing automation platform. Copy the image URL. Paste the URL into Knak when adding an image.
Use a Digital Asset Management (DAM) Integration
You can also host images in an external Digital Asset Management (DAM) platform, such as Adobe Experience Manager.
Connect your DAM through an available API integration.
Tools to Reduce Image File Size
Try these tools before uploading images into Knak:
Tool | Description | Link |
Photopea | Free online photo editor | |
Squoosh | Free, easy-to-use image compressor | |
Other editors | Use Photoshop or any image editing software | N/A |
How to Check Image File Size in Knak
Right-click on the image in the Image Library.
Click Inspect.
Hover over the image URL in the HTML to view the file size.
Summary
To stay within your hosting limit:
Optimize image file sizes before uploading.
Monitor usage via the CDN dashboard.
Consider external hosting or DAM integrations when needed.
Need more help? Contact Support via live chat within Knak using the chat bubble in the bottom right corner or email support@knak.com.