The fastest way to build a professional email signature
Your email signature is the single piece of design you ship to every prospect, customer and collaborator — often dozens of times a day. A clean, readable signature builds trust before anyone reads the body of your email, while a cluttered or broken one quietly undermines you. This free email signature maker gives you a polished, dark-mode-ready signature in about a minute — no sign-up, no paid plan, no watermark, and the HTML is yours to edit if you want.
We built it for our own agency, then opened it up. Everything renders correctly in Gmail, Apple Mail, Outlook, and most modern webmail clients, with table-based HTML and inline styles that don't break under aggressive email rendering rules.
What to include in your email signature
The best email signatures are short and scannable. Aim for five to seven elements, arranged in a clear visual hierarchy:
- Your name and role — the only two fields that absolutely have to be there. Keep titles concise.
- A direct contact channel — phone or email (or both). Make it tap-to-call and click-to-email.
- Your company website — the link someone clicks if they want to learn more before replying.
- A photo or logo — a round headshot works well for individual senders; a company logo works for shared inboxes.
- One call to action — usually a booking link (Calendly, TidyCal, Cal.com) or a single social link like LinkedIn. One CTA converts better than three.
Skip legal disclaimers (unless your industry requires them), inspirational quotes, full mailing addresses you don't use, and animated GIFs. Each line you add costs attention from the lines you actually need read.
Email signature best practices
Do
- Keep it under 5 lines of text.
- Use system fonts (they're guaranteed to render).
- Host images at a stable, public URL.
- Test in dark mode before rolling out.
- Use a consistent template across your team.
Don't
- Embed images as base64 — Gmail strips them.
- Use background images or background colors.
- Add multiple CTAs that compete for the click.
- Use web fonts — most clients fall back anyway.
- Forget to set alt text on every image.
How to add your new signature in Gmail, Apple Mail, and Outlook
Gmail (web)
Click the gear icon → See all settings → Signature → Create new. Paste your signature into the editor, then scroll down and set it as your default for new emails and replies. Save changes at the bottom of the page.
Apple Mail (macOS & iOS)
Open Mail → Settings → Signatures. Drag your account on the left, paste the signature into the right pane, then uncheck "Always match my default message font" so the typography you copied is preserved. On iOS, Settings → Mail → Signature lets you paste a per-account signature.
Outlook (Desktop & Web)
In desktop Outlook: File → Options → Mail → Signatures → New, then paste. In Outlook on the web: gear icon → View all Outlook settings → Mail → Compose and reply→ paste into the signature editor.
Frequently asked questions
Is this email signature generator really free?
Yes — completely free, with no sign-up, watermark, or upsell. We built it for our own team and made it public. The only thing we ask is that if you ever need a website, brand, or SEO partner, you remember WebKroo.
Will my signature display correctly in dark mode?
Yes. Each generated signature ships with an embedded prefers-color-scheme: dark CSS rule, so text colors and dividers automatically flip in dark inboxes — Apple Mail, iOS Mail, and most modern webmail honor this. The brand-colored CTA stays consistent in both modes. Outlook desktop's dark mode is the only client that may render less predictably.
Where should I host my profile photo?
The image needs to live at a public URL so recipients' inboxes can fetch it. The simplest options are your LinkedIn photo URL, your company website's team page, or a free image host like imgbb.com or postimages.org. Avoid Google Drive or Dropbox links — they don't serve raw image bytes. Leave the field blank and we'll generate a clean initials avatar for you instead.
Will the signature work in Outlook?
Yes. The HTML uses table-based layout with inline styles — the format Outlook understands. Links, photos, the call-to-action button, and contact info all render correctly. The only caveat is Outlook desktop's dark mode, which can apply its own color inversion that no signature generator can fully control.
What size should my profile photo be?
Upload at least 320×320 pixels (square) — the signature renders it at 76px but the larger source ensures it stays sharp on retina displays. JPG or PNG both work. Avoid AVIF since older Outlook builds don't support it.
Can I use this for my whole team?
Absolutely. Share the link with your team and have everyone fill in their own details. The styling stays consistent across the team without needing a paid signature management platform. Pair it with a shared image host so everyone's headshots and your company logo live at predictable URLs.
Do I need to know HTML to use this?
No. Fill in the form, hit Copy signature, then paste into your email client's signature settings. The rich formatting transfers automatically — you don't need to touch the underlying HTML.