What does this preview?

Any HTML email or newsletter content. Renders on desktop, tablet, and mobile widths.

Will this match Gmail/Outlook exactly?

Close but not perfect. Real client testing (Litmus, Email on Acid) is the gold standard for production.

Are templates supported?

Paste any HTML; tool renders. Mailchimp, Klaviyo, Customer.io exports all work.

Can I test dark mode?

No. This preview focuses on layout width checks; use Litmus, Email on Acid, or real inbox tests for dark-mode QA.

Do CSS-in-style work?

Yes — inline and blocks both render.

Is mobile responsive simulated?

Yes — resize the preview to test breakpoints.

Yes — HTML rendering is language-agnostic.

Should I trust this for production?

For initial review, yes. For final QA, use Litmus or send tests.

Renders in your browser; not retained.

Free Newsletter Preview Tool

Preview your newsletter HTML on desktop, tablet, and mobile widths. Live render, instant feedback. Free, no signup.

4.6on G2

4.8on Trustpilot

Used by 25,000+ marketers

HTML Source

Preview

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	Tool A	Tool B	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.

Mobile (52%)

Most-used preview device

8.4

Average sessions per template dev

Mobile layout breaks (38%)

Common issue caught

6 min

Median session time

Frequently asked questions

Twelve answers.

Related free tools

Other utilities that pair.

Try Newsletter Preview Tool now

Free, unlimited, no signup.

Try the Tool