What are rendering tools?
Rendering tools show how emails appear across different email clients and devices. They preview your message in Gmail, Outlook, Apple Mail, mobile clients, and dozens of other environments, revealing display inconsistencies before sending.
Why rendering matters: email clients interpret HTML/CSS differently. What looks perfect in your editor may break in Outlook or Gmail. Rendering testing catches display issues before recipients see broken layouts, missing images, or formatting problems.
Major tools include Litmus, Email on Acid, and PreviewMyEmail. They maintain rendering environments simulating many client/device combinations. Testing across this matrix ensures your message displays acceptably everywhere.
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