---
title: HTML Email Preflight Checker | SendHQ
description: Analyze email HTML, plain text, links, accessibility, and common client-safety risks locally in your browser before sending a test.
canonical: https://sendhq.cc/tools/email-preflight-checker
last-updated: 2026-09-24
---
# HTML Email Preflight Checker

Catch common HTML email, accessibility, link, and content problems before a controlled send. The analyzer uses the browser's parser and never uploads your draft.

## A preflight is not a client matrix

Static analysis can identify scripts, forms, missing image alternatives, absent plain text, placeholder links, and layout signals. It cannot reproduce every Gmail, Outlook, Apple Mail, or assistive-technology rendering path.

## Use email-safe foundations

Keep the primary layout simple, use presentation tables where needed, provide meaningful text and alt attributes, inline essential styles, and make actions understandable without images. A responsive viewport and mobile rules improve small-screen behavior.

## Always send a controlled test

Render the final server-produced HTML with representative data, send it to inboxes you administer, inspect links and received headers, and test keyboard and screen-reader reading order before production.

## Questions about this tool

**Does this checker send an email?**

No. It only analyzes the values in this page and makes no network request.

**Does a clean result guarantee email-client compatibility?**

No. It reduces common risks but cannot emulate all engines, settings, dark modes, security filters, or assistive technologies.

**Can this validate an email address?**

It checks only basic address syntax. It cannot establish that a mailbox exists or will accept mail.