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Email Accessibility: Alt Text, Contrast, and Readable Structure

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Accessible email is better email for everyone

Email accessibility is often framed as a compliance checkbox, but it’s really about reach and quality. An accessible email works for people who use screen readers, people with low vision, people who read with images turned off, and people skimming on a small phone in bright sunlight. That’s not a niche — it’s a large fraction of every audience.

And here’s the useful part: the techniques that make email accessible also make it more robust across clients. Good alt text saves you when images don’t load. High contrast survives dark-mode inversion. A logical structure reads well when columns stack on mobile. Accessibility and reliability are the same work.

Alt text: your safety net when images don’t load

Many email clients block images by default until the reader opts in, and some readers keep them off permanently. When an image doesn’t load, its alt text is what appears in its place — and it’s what a screen reader announces. Miss it, and an image-heavy email becomes a wall of empty boxes.

  • Describe the purpose, not just the picture. For a button image, “Start your free trial” is more useful than “blue button.”
  • Add alt text to every meaningful image — hero images, product shots, and especially any image that functions as a link or button.
  • Leave decorative images with empty alt text (alt="") so screen readers skip them instead of announcing noise.
  • Don’t put critical information only in images. If a discount code or headline lives only inside an image, readers with images off never see it. Keep essential content as real text.

Color contrast: readable in every light

Low-contrast text — light gray on white, pale text on a colored background — is hard to read for many people and becomes unreadable in bright light or after a client shifts colors in dark mode.

  • Aim for the WCAG contrast ratios: at least 4.5:1 for normal body text and 3:1 for large text against its background.
  • Test your CTA buttons specifically. The button’s text against its background color is the contrast that matters most, since it’s your key action.
  • Don’t rely on color alone to convey meaning. If “in stock” is green and “sold out” is red with no other difference, colorblind readers can’t tell them apart. Add a word or icon.
  • High contrast helps dark mode too. A design that already has strong contrast degrades more gracefully when a client inverts it. See Dark Mode Email Design.

Structure: order that makes sense when read aloud

Screen readers move through an email in source order, and on mobile every multi-column row collapses into a single stacked column. Both mean your content order has to make sense linearly.

  • Build a logical reading order. Header, then main message, then supporting content, then footer — top to bottom.
  • Use real headings, not just big bold text. Semantic headings let screen-reader users navigate and give the email a clear hierarchy. See Email Design Best Practices.
  • Design so columns stack sensibly. A row where the image sits left of its caption should still read “image, then caption” when it stacks on mobile — not the reverse. See Mobile-First Email Design.
  • Set the language so screen readers use the correct pronunciation.

Font size and tap targets: readable and usable

  • Keep body text around 14–16px. Anything smaller strains the eye, especially on phones.
  • Use generous line height so paragraphs are easy to scan.
  • Make links and buttons big enough to tap. A target that’s fine for a mouse is often too small for a thumb. Give buttons real padding.
  • Don’t cram. Whitespace is an accessibility feature — it separates ideas and reduces cognitive load.

A quick accessibility checklist

Run through this before you send:

  • Every meaningful image has descriptive alt text; decorative images have empty alt text.
  • No essential information lives only inside an image.
  • Body text and buttons meet WCAG contrast ratios against their backgrounds.
  • Meaning is never conveyed by color alone.
  • Content reads in a logical order top to bottom, including when columns stack.
  • Body text is at least 14px and buttons are comfortably tappable.

How Temway supports accessible email

A visual builder makes most of this the natural path. In Temway you set alt text on each Image block, adjust font size, line height, alignment, and button padding per block in the properties panel, and standardize an accessible, high-contrast palette through workspace branding so every email starts on solid footing.

Because Temway builds every email to render consistently across clients, the exported HTML is structured, self-contained, and stacks cleanly on mobile — the reliable base accessible email depends on. Check the reading order and contrast across Desktop and Mobile, then test-send a copy to your own inbox to verify with images off before you export or push to your ESP.

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