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 40 pre-send checks in seconds — Gmail clipping, Outlook rendering, WCAG contrast, broken links, missing alt text and spam triggers — next to a live preview with simulated Gmail, Outlook, dark-mode and images-off views. 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 Pro.)

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 Pro.)

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.

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.

Read the report

40 checks grouped into Deliverability, Rendering, Images, Links, Structure, Accessibility and Content, each with a plain-English "how to fix". The report is free; ten advanced findings are Pro.

Preview & send clean

Eyeball the desktop/mobile preview and the simulated client views — each lists exactly what that client strips — 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 preview with simulated Gmail and images-off views — all free. Pro unlocks ten advanced findings — Outlook/Word-engine rendering, spam-trigger scoring, un-inlined CSS, dark mode, the hidden preheader, table semantics, ambiguous link text, CTA consistency, WCAG colour contrast and alt-text quality — plus the simulated Outlook and dark-mode previews one-click safe auto-fixes with a before/after diff, version compare between amends, and shareable QA reports (a design-only review or the full design + tech version). 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.

Previews: devices & clients

Desktop and mobile widths, plus simulated Gmail, Outlook, dark-mode and images-off views that list what each client strips. Rule-based and labelled — not real screenshots.

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 and simulated Gmail and images-off views. Ten of the more advanced findings — Outlook/Word-engine rendering, spam-trigger scoring, un-inlined CSS, dark mode, the hidden preheader, table semantics, ambiguous link text, CTA consistency, WCAG colour contrast and alt-text quality — plus the simulated Outlook and dark-mode previews, the one-click safe auto-fixes, version compare and shareable QA reports are Pro; 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?

40 pre-flight checks grouped into Deliverability, Rendering, Images, Links, Structure, Accessibility and Content: 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 and return true screenshots. Ours reads your HTML, catches the common, predictable problems, and adds simulated Gmail, Outlook (Word-engine), dark-mode and images-off previews — rule-based approximations built from each client's documented CSS support, each listing exactly what that client strips from your code. Useful, clearly labelled — and still not real screenshots. 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, so you can eyeball reflow, font sizing and tap targets — and client tabs re-render it through simulated Gmail, Outlook, dark-mode and images-off rules, each with a list of what changed. The images-off view is exact (blocking is deterministic); the rest are labelled simulations, not screenshots.

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.

Do these tools use credits or tokens?

No — never. Every tool is free to use with sample or daily limits, and PRO is a flat $25/month ($199/year) for unlimited use of all 30+ tools: no credit packs, no top-ups, no per-use fees. Many comparable tools bill per credit (remove.bg, CloudConvert, AdCreative.ai) — here one flat subscription covers everything. See tools pricing.

QA your email before you send — free.

No signup to scan, nothing uploaded — run 40 pre-flight checks with device previews and simulated client views. Ten advanced findings and the Outlook/dark-mode previews unlock with Pro; everything else is free. Catch the inbox problems early, or hand the build to us.

Run the email QA Get your email built