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 hosting limit, measured in terabytes (TB). You can monitor usage by visiting CDN Usage.
How Hosting Impacts Your Account
Every time a recipient views an email or landing page with hosted images, those images are downloaded from Knak’s servers. This contributes to your hosting usage.
Your usage depends on:
How many times each image is downloaded (usually once per email)
The file size of each image
Over time, this can increase costs—especially with large files or high-volume sending.
How to Monitor Usage
To check your current and projected CDN usage:
Review your total allowed hosting space and usage details.
Contact your Customer Success Manager if you’re over your limit or are projected to go over.
Customers will be able to visit https://enterprise.knak.io/account/cdn-usage within their account to view current and projected CDN usage and any associated costs. This page will display your total allowed terabyte limit and current and projected usage. If you're account is over the limit or projected to go over, please reach out to your customer success manager to discuss your options.
Tips to Minimize Hosting Usage
1. Optimize Image File Size
Reducing file size helps lower costs and improve performance.
File size: Aim for under 100 KB. Do not exceed 300 KB for large images.
Image width: Use images twice the width of the container (e.g., 1200px for a 600px-wide email).
Animated GIFs: Reduce frame count and dimensions to save space.
Learn more:
2. Use External Image Hosting
For Marketo Users: Use the Knak-Marketo Image Library Integration to store images directly in your Marketo instance.
For Other Platforms: Upload images to your marketing automation platform and paste the image URL into Knak.
3. Use a DAM Integration
Use an external Digital Asset Management (DAM) platform like Adobe Experience Manager to host images. Connect via 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 |
💡 Squoosh reduced an 800 KB image to just 11 KB.
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.