How do I send a test email before launching a campaign?

With Postdrop, you can send test emails directly from the editor to any inbox via Mailgun. Enter recipient addresses, hit send, and verify how your HTML email looks before you launch.

Can I preview HTML email templates online for free?

Yes. Postdrop's free plan includes desktop, mobile, and dark mode preview, plus shareable preview links that anyone can view without an account. Live multi-client renders (Gmail, Outlook, iOS, Android, and more) require Solo or Pro.

How do I test dark mode rendering in HTML emails?

Postdrop includes a built-in dark mode previewer. Toggle between light and dark mode instantly to see how your email template adapts, without needing to send test emails or switch device settings.

What email clients does Postdrop test against?

Postdrop's CSS inliner optimizes HTML for major clients including Gmail, Outlook, Apple Mail, and Yahoo Mail. On Solo or Pro you can generate live client renders across Gmail, Outlook, iOS, Android, and more. You can also send test emails to any inbox.

Can I export my email template to Mailchimp, HubSpot, or SendGrid?

Yes. Export clean, inlined HTML and paste it into Mailchimp, HubSpot, Klaviyo, SendGrid, Customer.io, Campaign Monitor, or any other ESP.

How can I view and share HTML email templates with my team?

Share any template as a preview link. Recipients can view the HTML email in their browser on desktop or mobile with no login required. Sharing a link is different from generating live client renders, which are a paid Solo or Pro feature.

Test Send HTML Email Templates, Preview & Export

From prompt to inbox-ready HTML

Four steps from a blank start to something you can preview, share, and export.

AI compose starting an HTML email from a prompt

Start with a prompt or your own template

Use AI compose when you want a head start, or jump straight into a starter template. Either way you land in real HTML you can own.

HTML and CSS editor with live email preview

Edit your HTML and CSS

A real code editor with syntax highlighting and auto-save, not a locked-down drag-and-drop canvas. Tweak structure and styles until the email is yours.

Preview in popular email clients

Check desktop, mobile, and dark mode in the app. Live inbox renders in Gmail, Outlook, iOS, Android, and more, so you catch broken layouts before customers do.

Share and export when ready

Send a preview link anyone can open, fire a test email, then export clean inlined HTML straight to your ESP.

Everything in Postdrop

Editor, previews, export, brand tools, and team sharing in one workspace, built for shipping HTML email that holds up in the inbox.

Editor

Syntax highlighting, auto-complete, and auto-save in a real HTML/CSS editor.

Live previews

Real renders in Gmail, Outlook, iOS, Android.

ESP support

Clean, inlined HTML that drops into Mailchimp, Klaviyo, HubSpot, and more.

Brand settings

Set logo, name, and color once. Every new template stays on-brand.

Dark mode & devices

Preview desktop, mobile, and dark mode in the app on every plan.

Team sharing

Invite your team. Review together.

Export & share

Export inlined HTML to your ESP, or share an HTML preview link or live preview link with screenshots.

Simple plans. Start free, upgrade when you need more or live previews.

Free

$0 / mo

3 templates
10 exports / mo
10 test emails / day
1 user
Dark mode preview
2 AI templates / mo
0 live client preview credits

Start free

Popular

Solo

$29 / mo

30 templates
Unlimited exports
100 test emails / day
1 user
10GB images
50 AI / mo
40 live client previews / mo

Get Solo

Pro

$79 / mo

200 templates
Unlimited exports
500 test emails / day
5 users
100GB images
250 AI / mo
150 live client previews / mo
Priority support

Get started

Enterprise

Custom

Unlimited templates & exports
API & integrations
Custom live preview limits
Unlimited users
Priority support

Contact sales

Built by people who lived the email pain

Postdrop was founded by product and design leaders with 20+ years across Mailgun, OneSignal, and open-source email tools (20,000+ GitHub stars). We built the workflow we wished we had.

Frequently asked questions

How do I send a test email before launching a campaign?: Send test emails from the editor to any inbox via Mailgun. Enter recipients, hit send, and verify how your HTML looks before you launch.
Can I preview HTML email templates online for free?: Yes. Free includes desktop, mobile, and dark mode preview, plus shareable preview links (viewable without an account). Live multi-client renders require Solo or Pro.
How do I test dark mode rendering in HTML emails?: Use the built-in dark mode previewer. Toggle light and dark instantly without sending tests or changing device settings.
What email clients does Postdrop test against?: CSS inlining targets major clients. On Solo or Pro you can generate live renders across Gmail, Outlook, iOS, Android, and more. You can also send test emails to any inbox.
Can I export my email template to Mailchimp, HubSpot, or SendGrid?: Yes. Export clean, inlined HTML and paste it into Mailchimp, HubSpot, Klaviyo, SendGrid, Customer.io, Campaign Monitor, or any other ESP.
How can I view and share HTML email templates with my team?: Share a preview link. Recipients view it in the browser with no login. That’s separate from generating live client renders, which need Solo or Pro.

Catch broken HTML emails before your customers do.

Preview on device and dark mode for free. Upgrade for unlimited exports and live client previews, then export clean HTML to your ESP.

Start for free Try the editor