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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