Free report · No signup to scan · Runs in your browser

Free HTML email pre-flight QA

Paste your HTML email or drop a .html / .zip, and run ~17 pre-send checks in seconds — Gmail clipping, Outlook rendering, broken links, missing alt text and spam triggers — next to a live desktop and mobile preview. Catch the problems before your subscribers do.

Run the email QA How it works
Your email never leaves your browser — nothing is uploaded.
What it checks

The things that break in the inbox.

Deliverability

Gmail's 102 KB clipping threshold, the unsubscribe link, the hidden preheader and spam-trigger words. (Preheader and spam scoring are Premium.)

Rendering

Email width, responsiveness, web fonts, and CSS that the Outlook/Word engine or dark mode won't honour. (Outlook, un-inlined CSS and dark mode are Premium.)

Images & links

Missing alt text, non-https or relative image URLs, image dimensions, and empty or "#" links that go nowhere.

Structure

The email doctype, charset and viewport meta — the boilerplate clients quietly need to render your markup correctly.

How it works

Paste, scan, read the fixes.

1

Paste or upload

Drop your HTML email as raw markup, a .html file or a .zip. Nothing uploads to a server — it's parsed locally in your browser.

2

Read the report

~17 checks grouped into Deliverability, Rendering, Images, Links and Structure, each with a plain-English "how to fix". The report is free; five advanced findings are Premium.

3

Preview & send clean

Eyeball the live desktop and mobile preview, fix what's flagged, re-scan, and send with fewer surprises.

What's free

Most of the report is free.

No signup to scan, nothing uploaded, and a live desktop + mobile preview — all free. Five of the more advanced findings unlock with Premium: Outlook/Word-engine rendering, spam-trigger word scoring, un-inlined CSS, dark-mode hints and the hidden preheader check. Everything else — Gmail clipping, width, unsubscribe, images, links and structure — you see for free.

Private by design

The pre-flight runs entirely in-browser. Your email HTML never leaves your machine — safe for unsent and NDA work.

Desktop & mobile preview

See your email at desktop and narrow mobile widths side by side, so you catch reflow a code check can't.

A pre-flight, not a render farm

This is a fast static first pass — not full inbox-rendering testing like Litmus or Email on Acid. It catches the predictable problems before you send.

Want it coded right the first time?

We hand-code responsive HTML emails that hold up.

Skip the scan-fix-rescan loop. Send us the design and get bulletproof, inline-styled email that renders across Gmail, Outlook and Apple Mail — white-label.

EDM / HTML email development
FAQ

Quick answers.

Is the email QA tool really free?
Yes — paste or upload an HTML email and the full pre-flight report runs in your browser at no cost, alongside a live desktop and mobile preview. Five of the more advanced findings — Outlook/Word-engine rendering, spam-trigger word scoring, un-inlined CSS, dark-mode hints and the hidden preheader check — are Premium; everything else is free.
Do my emails get uploaded to a server?
No. The whole pre-flight runs entirely in your browser — your HTML never leaves your machine, so it's safe for unsent campaigns and client work under NDA.
What does it actually check?
Around 17 pre-flight checks grouped into Deliverability, Rendering, Images, Links and Structure: Gmail's 102 KB clipping threshold, email width, the unsubscribe link, hidden preheader, spam-trigger words, un-inlined <style> CSS, Outlook/Word-engine-unsupported CSS, web fonts, responsiveness, dark-mode hints, image alt text, absolute-https image URLs, image dimensions, empty or "#" links, and the doctype/charset/viewport. Each finding comes with a plain-English "how to fix".
Is this the same as Litmus or Email on Acid?
No — and we won't pretend it is. Litmus and Email on Acid render your email inside dozens of real inbox clients. Ours is a lightweight static pre-flight: it reads your HTML and catches the common, predictable problems before you send. It's a fast first pass, not a replacement for full inbox-rendering testing.
What's the difference between the desktop and mobile preview?
The tool renders your email at a desktop width and a narrow mobile width side by side, so you can eyeball reflow, font sizing and tap targets — the kind of layout issues a code check alone can't show you.
Can you just build the email for me?
Yes — we hand-code responsive HTML emails that hold up across Gmail, Outlook and Apple Mail. See EDM / HTML email development or send us a brief.

QA your email before you send — free.

No signup to scan, nothing uploaded — run ~17 pre-flight checks with a live desktop and mobile preview. Five advanced findings unlock with Premium; everything else is free. Catch the inbox problems early, or hand the build to us.

Run the email QA Get your email built