Changelog

Seven free email tools, and a pre-send report that tells you what to fix first

Everything below is live now.

Check any email, free, without an account

There are now seven free tools at proofel.com/tools — no signup, no usage limit, and your HTML never leaves your browser.

Start with the all-in-one email checker. Paste your HTML once and you get a score out of 100, the three things worth fixing first, and then every engine's findings underneath. It exists because the other tools each answer one narrow question, and you shouldn't have to already know whether your problem is contrast, Outlook, or clipping in order to pick one.

The other six:

  • HTML email preview — render through 20 client-and-platform combinations, at nine widths, in per-client dark mode, with images blocked and Gmail's clip line located in your document
  • Spam checker — the structural signals filters actually react to
  • Accessibility checker — WCAG AA contrast measured from the resolved cascade, then measured again inside a simulated dark-mode inversion
  • Subject line preview — where ten real inbox rows cut your subject, measured in pixels rather than counted in characters
  • .eml viewer — open a saved email in the browser, inline images and all
  • Deliverability check — SPF, DKIM and DMARC read live from DNS

Compare clients side by side

The preview tool is now a workspace: a code editor beside the preview, and as many client columns as you want, scrolling in sync. Add Gmail on Android next to Outlook on Windows and watch the same email diverge. Each column has its own light/dark toggle, because Gmail flattens, Apple Mail inverts, and Outlook does neither — one shared switch would hide exactly the difference you opened the view to see.

MJML files work too, alongside .html and .eml.

One-click fixes for the mechanical problems

Eleven deterministic repairs — a missing lang, a viewport meta, rel="noopener", role="presentation" on layout tables, Outlook's DPI and line-height rules, image dimensions.

They touch attributes and wrappers only. None of them change how your email looks, and every one is reversible. What they deliberately won't do is invent alt text, rewrite your subject line, pick a colour to fix contrast, or re-encode an image — those need a person, so they stay on the list as findings rather than being quietly counted as fixed.

Seeing which findings are fixable is free. Having Proofel make the change is part of Pro, and a new account's 14-day trial includes it.

In the app

  • Checks menu in the email header — the pre-send report and Email Cleanup, next to Versions and Links
  • A verdict before you send. The approval modal now shows the score and names any critical findings. It warns; it never blocks. Sending is always one click.
  • Compare clients inside the viewer, the same way you compare versions
  • The report as a proper PDF — a designed document with your score, the findings and their evidence, rather than a screenshot of the screen
  • View panels sit beside your email instead of below it

Fixes

  • Annotation pins kept their colour under a colour-vision lens (they were being repainted along with the email)
  • Team members on a paid plan were shown an upgrade prompt on canvases their own team already paid for
  • Dropping a .eml with inline images no longer breaks them for reviewers
  • Uploading a .eml and previewing one now share a single code path, so they can't drift apart again

Paste an email into the checker and see what it says. If it's useful, start a trial and the same email carries straight over as a shareable review.