Online Tool Store
Email Client Preview Tester
Paste email HTML and preview approximately how it renders in Gmail, Outlook, Apple Mail, and Yahoo Mail. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Preview by client
Gmail
Outlook
Apple Mail
Yahoo Mail
Example shown — paste your own email HTML to preview across clients.
How it works
- Paste your email's HTML markup.
- Each client's known CSS support gaps are simulated on the rendering.
- Compare how your email looks across Gmail, Outlook, Apple Mail, and Yahoo.
Simulation strips or approximates CSS properties each client is known to handle differently — Outlook's limited flexbox and background-image support in particular — giving a rough preview of cross-client differences before you send.
FAQ
Is my email HTML uploaded anywhere?
No. Previewing happens entirely in your browser — your HTML is never sent to a server.
Which email clients does it simulate?
Gmail, Outlook, Apple Mail, and Yahoo Mail — the clients with the most divergent CSS support and the most common source of rendering surprises.
Why does an email look different across clients?
Email clients support wildly different subsets of CSS — Outlook in particular uses Word's rendering engine, which ignores much of modern CSS that Gmail and Apple Mail support fine.
Does it catch every possible rendering issue?
It simulates the most common CSS support gaps. For guaranteed accuracy, always test critical campaigns with a real send or a dedicated testing service before launch.
How we compare
| Feature | Online Tool Store | Sending real test emails | Paid preview services |
|---|---|---|---|
| No email account setup needed | ✓ | Requires accounts on multiple clients | ✓ |
| Free, instant | ✓ | ✓ | Usually subscription-based |
Paid preview services capture real screenshots but cost money. Email Client Preview Tester gives a quick, free approximation for the early draft stage.