Learn · email signature glossary
TL;DR
A dark mode email signature is a signature that remains readable when the recipient's email client applies a dark theme. Clients handle dark mode in incompatible ways: some leave your colors alone, some invert light backgrounds to dark, and some (notably Outlook and Gmail apps) partially recolor text while leaving images untouched. The classic failure is a dark grey logo or dark text baked into an image sitting on a now-dark background, effectively invisible to the recipient.
Re: In practice
A large share of recipients read email in dark mode, especially on phones, so a signature that only works on white is broken for a meaningful slice of your audience and you will rarely hear about it. The fixes are mostly design choices made up front. Use a logo file that works on both light and dark backgrounds, typically a PNG with transparency, and avoid pure-black artwork; a thin white outline or padding baked into the image keeps dark marks visible after inversion. Avoid setting text as pure black or pure white, since mid-tone greys invert more gracefully. Do not bake important text into images at all, because clients recolor text but not pixels. Then test: send the signature to yourself and flip your mail app to dark before shipping it to a team.
Fwd: Worth a look
email signature colors
Email signature colors are the text, accent, and link hues in your sign-off, set as inline hex values and chosen to survive dark mode inversion.
email signature generator
An email signature generator is a tool that turns your details into ready-to-paste, email-safe HTML, sparing you from hand-coding tables.
email signature image formats
PNG, JPG, and GIF are the image formats that work in email signatures. Learn which to use for logos, photos, and banners, and why SVG fails.
email signature photo
An email signature photo is a small headshot beside your contact details that puts a face to your name. See sizing, format, and when to use one.
mobile email signature
A mobile email signature is what appears under messages sent from your phone, set separately per app and best kept short and narrow.
responsive email signature
A responsive email signature stays readable on any screen width. In practice that means compact fixed-width tables, not media queries.
Free generator, no account required. Works in Gmail, Outlook, and Apple Mail.
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