Newsletter Preview Tool
Preview your email at any width.
Preview 1024 px and wider
How to use the Newsletter Preview Tool, step by step
Real screenshots of the current tool, using sample inputs. Long results are shown as a preview.
- 1
Add your input
Paste or type into the field Newsletter Preview Tool works from.
- 2
Sample text in place
With sample text entered, Newsletter Preview Tool is ready to run.
- 3
Review the result
The output updates as you change the input or settings. Review the result shown here.
What this tool does
Newsletter Preview Tool renders any newsletter HTML across desktop, tablet, and mobile widths so you can iterate fast before scheduling the send.
Use as the first-pass preview; final QA via Litmus or real-device tests.
How to use it
Five steps.
Paste HTML
Newsletter HTML content.
Pick device
Desktop, tablet, or mobile.
Review render
See live render.
Iterate
Edit HTML, see changes.
Copy final HTML
Drop into your sender.
When teams use it
Six common workflows.
Pre-send QA
Preview newsletter before scheduling.
Template development
Iterate on HTML email templates.
Mobile responsiveness check
Verify breakpoints in newsletter.
A/B variant comparison
Open multiple variants in tabs.
Client review
Show clients before sending.
Newsletter platform migration
Test imported templates.
Platform-specific guides
Integrate with major platforms.
Mailchimp
- Export HTML from campaign.
- Paste here for instant preview.
- Send to test list for production QA.
Klaviyo
- Export campaign HTML.
- Preview here for fast iteration.
- Use Klaviyo preview for final.
Customer.io
- Copy newsletter HTML.
- Paste, test mobile/desktop.
- Send tests via platform.
Custom HTML newsletters
- Develop locally.
- Copy HTML, paste here.
- Iterate on responsive design.
Production QA tools
- Use this for first-pass.
- Litmus or Email on Acid for client matrix.
- Real-device test top 5 clients.
Grigora vs. alternatives
Side-by-side.
| Capability | Grigora | Mailchimp Preview | Litmus | Free | Manual |
|---|---|---|---|---|---|
| Free + unlimited | Yes | Yes | Free trial | Yes | Manual |
| Multi-device preview | Yes | Limited | Yes | No | Manual |
| Real-time render | Yes | Yes | Yes | Yes | Manual |
| No signup | Yes | Yes | Account required | Yes | Yes |
| Result speed | Instant | Instant | <5 sec | Instant | Manual |
| Dark mode preview | No | Yes | Yes | No | No |
| Email client matrix | No | No | Yes | No | Manual |
| HTML editing | Inline | No | Yes | No | Manual |
Common errors and how to fix them
Eight issues users hit.
Images broken
Cause: Local paths or auth-required URLs.
Fix: Use public CDN URLs.
Layout breaks on mobile
Cause: Fixed-width tables.
Fix: Use max-width: 100% on tables.
Custom fonts missing
Cause: Email clients strip web fonts.
Fix: Use web-safe fonts as fallback.
CSS not applying
Cause: Some clients strip <style> blocks.
Fix: Inline critical CSS.
Email-client rendering differs
Cause: Gmail, Outlook, and Apple Mail each support different subsets of HTML/CSS.
Fix: Use this for fast layout review, then run final checks in Litmus, Email on Acid, or real inboxes.
Rendering different from Gmail
Cause: Gmail strips some CSS.
Fix: Use email-safe HTML/CSS practices.
Outlook breaks layout
Cause: Outlook uses Word rendering engine.
Fix: Use VML for backgrounds; tables for layout.
Mobile clipping
Cause: Fixed-width images.
Fix: Use max-width: 100% for all images.
Original data from our 2026 study
Across user sessions.
Frequently asked questions
Twelve answers.
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