Achieve Consistent Email Viewing Experience Across Different Platforms.
Cross-Client Compatibility Check In Seconds.
Campaign Cleaner's Email Inbox Preview tool renders your campaign in real email clients across desktops, tablets, and phones - so you can catch broken layouts, missing images, and font issues before a single subscriber sees them.
Quick Overview of Features
Email inbox preview testing renders your campaign in real email client environments - Gmail, Outlook, Apple Mail, Yahoo Mail, and others - and returns screenshots showing exactly how your message looks in each one. It's the only reliable way to catch layout problems, clipped content, broken images, and font issues before your campaign reaches actual subscribers. Sending without previewing first is one of the most common and costly mistakes in email marketing.
Every email client uses its own rendering engine - and many of them ignore, strip, or reinterpret standard CSS in different ways. Outlook on Windows uses the Microsoft Word rendering engine, which doesn't support Flexbox, CSS Grid, or most modern layout techniques. Gmail removes CSS from the document head and only applies inline styles. Apple Mail is the most standards-compliant but still differs from web browsers in important ways. The result is that the same email can look polished in one client and completely broken in another.
Email clients use fundamentally different rendering engines - there is no shared standard the way web browsers approximate HTML and CSS. Outlook for Windows relies on the Microsoft Word rendering engine, which ignores Flexbox, CSS Grid, and most modern layout CSS. Gmail strips all styles from the document head and only applies inline styles, which is why CSS inlining is so important for Gmail compatibility. Apple Mail and iOS Mail use WebKit and are the closest to a real browser, but they still impose email-specific behaviors. The result is that a single campaign can look professional in one client and completely broken in another - which is exactly why inbox preview testing is an indispensable step before any send.
The clients that matter most depend on your audience, but as a baseline every email sender should test Gmail (desktop web and Android), Apple Mail (macOS and iOS), Outlook (2016, 2019, 2021, and 365), and Yahoo Mail. These four collectively account for more than 90% of all email opens globally. B2B senders should weight Outlook heavily - it remains the dominant client in corporate environments. Consumer and DTC brands should prioritize Gmail and Apple Mail. If you have international audiences, check your analytics for regional client distribution - Outlook is rare in many markets where Gmail dominates completely.
Are You Ready To Experience The Difference?
Become a part of the Campaign Cleaner community today, and join countless satisfied customers who have witnessed significant improvements in their email deliverability and campaign success. Don't let HTML issues hold you back; let Campaign Cleaner optimize your campaigns and boost your inbox rates.
