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About this tool
Design a professional, email-safe HTML signature with live preview, 25+ templates, social icons, CTA buttons, QR code and vCard — then copy or download it for Gmail, Outlook, Apple Mail and Yahoo.
The Email Signature Builder generates an email-safe HTML signature built from nested tables and inline styles — the only markup dialect Gmail, Outlook, Apple Mail and Yahoo all render the same way — and lets you copy it straight into your mail client. You fill in your name, role and contact details, pick one of 26 templates across Professional, Modern, Minimal, Creative and Corporate sets, and toggle optional blocks for social icons, a CTA button, meeting links, a banner, a QR code and a legal disclaimer. A built-in checker scores the result and flags the things that actually break signatures: base64 images, http:// image URLs, missing alt text and tables wider than 600px.
Open Email Signature Builder on AltFTool — it loads instantly in your browser.
Fill "Personal details" — Full name, Job title, Company, Email, Phone, Mobile, Website, Address — and pick one of the 26 templates across the Professional, Modern, Minimal, Creative and Corporate sets.
Toggle the optional blocks (photo, logo, social icons, CTA "Button text" and URL, meeting links, banner, "QR contents" and disclaimer), then switch the preview tab from Gmail to Outlook to see the square corners Word's engine draws.
Check the "Signature quality" score out of 100 for base64 images, http:// sources, missing alt text and width over 600px, then press "Copy signature" or export HTML, PNG, PDF or vCard (files named from your full name, e.g. aarav-sharma.html).
Switching the preview to Outlook strips border-radius from buttons and photos so you see the square corners Word's rendering engine will actually draw.
Every render is scored against concrete failure modes — embedded base64 images, mixed-content http:// sources, missing alt text, signature width over 600px, HTML over 40KB.
Social badges are drawn as coloured table cells with letter labels instead of hosted images, so they still appear when a recipient's client blocks remote images.
Outlook renders email with Microsoft Word's engine, which ignores flexbox, grid, CSS variables and media queries and drops border-radius. This builder outputs nested tables with inline styles and explicit pixel widths for that reason, and the Outlook preview toggle shows you the square-cornered version before you paste it.
Keep it at or under 600px — the builder defaults to 480px and warns once you exceed 600px, because most email bodies render at 600px or less and a wider table forces horizontal scrolling. Banners are a tighter constraint still: many mobile clients show roughly 320-420px, so anything above 500px gets scaled or cut.
You can, but the checker flags it as a warning: uploaded images become base64 data URLs, and Outlook plus several webmail clients refuse to display them. For images that show up everywhere, host the file and paste its https:// URL — http:// sources are flagged as an error because mixed content is blocked outright.
Three options: your website URL, a custom link, or a vCard 3.0 record built from the name, title, company, email, work and mobile numbers, website and address you entered. The vCard mode is what lets someone scan once and save you as a contact, and you can also download the same record as a .vcf file.