See how your emails look before you hit send
Check exactly how your emails render in every major client, device, and mode before they reach a single customer.
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Join thousands of companies using Mailosaur
Take the guesswork out of your emails
Preview every email in every inbox
Catch display differences before they become customer-facing issues and ensure every message looks perfect across devices, email clients, and settings.
Validate dynamic content
Preview emails exactly as your users receive them, including personalization fields and conditional content.
Catch rendering issues
Identify broken images, layout inconsistencies, dark-mode errors, and HTML/CSS quirks instantly.
Coverage for different devices, email clients and settings
Did you know your emails will render differently across different devices and email clients?
Mailosaur’s real-device previews help you ensure your message displays exactly as intended no matter if your customers use Outlook or Gmail, iPhone or Android, light or dark mode.
Fix issues you'd never spot otherwise
With the preview feature, it is easier than ever to see exactly which parts of an email are causing problems.
Whether it’s a broken image, formatting errors, issues with dynamic fields - Mailosaur makes troubleshooting quick and easy.
Why Mailosaur?
There are so many reasons that Mailosaur is the best email preview tool for your workflow.
Fully native device previews
Mailosaur previews are fully native, providing the most accurate simulation of how content or applications will appear and function on actual physical hardware
Team collaboration
With options to share previews with your team and set hierarchal permissions for specific projects, you can keep everyone on the same page.
Broad client & device coverage
With coverage across countless email clients and devices, you can be confident that Mailosaur covers everything you need to see.
Built for QA and automation
Built with QA and automation in mind, Mailosaur's simple integration and intuitive UI allows seamless integration into your CI/CD pipelines, with no need for the steep learning curve of alternatives.
Save yourself time and automate it
With one of our Enterprise plans, you can take your testing to the next level automating preview generation as part of your regular workflows.
Our products
Email testing
Create end-to-end tests that rely on email. Test account verification emails, password resets, email tracking, and more.
SMS testing
Build text messages that work. Create end-to-end tests that cover identity verification, alerting, promotional messages and more.
Email previews
Instantly see how your email will look to any recipient, no matter what email client they use, so there are no nasty surprises.