Email signature brand guidelines are a one-page set of rules that tell everyone at a company what their signature must contain and how it must look. This article gives you that page as a fill-in table, a worked example for a made-up company, and the reasoning behind each row so you can change it for yours.
The aim is modest. Nobody reads a forty-page brand manual to write an email. They read one page, once, and then they copy a template. So the page has to answer the questions people actually ask: which phone number goes in, can I add a quote, how big is the logo, what do I do for a reply.
The short version
- Write your email signature brand guidelines as a table with an answer in every row. A blank row is a decision nobody made.
- Fix what must match across people (layout, logo, colours, legal line). Leave open only name, title, direct phone and optional links.
- Check colours against the 4.5:1 contrast ratio that W3C sets for normal text, in both light and dark mode.
- Give the page an owner and a review date, and keep a shorter version for replies.
- Rules are only half the job. Give people a ready template, because most will copy it rather than follow a description.
Why you need email signature brand guidelines
Without email signature brand guidelines, each person decides alone. One adds a motivational quote, another a banner from last spring, a third pastes the logo at full size. None of them is wrong in isolation. The result is a company that looks as if it has never met itself.
A written page also settles arguments. When the managing director wants a second phone number added, the answer is in the document and not in someone’s mood. If you are rolling the signature out company-wide, this page sits next to the plan in our guide to company email signatures. If you need the formal, enforceable version with consequences, that is an email signature policy. Email signature brand guidelines describe how it should look. A policy says who decides and what happens when it is not followed. Many small companies need only the first.
The one-page template for email signature brand guidelines
Copy this table of email signature brand guidelines into a document and fill in the right-hand column. The suggestions in the third column are starting points, not rules.
| Area | Your rule (fill in) | Suggestion |
|---|---|---|
| Fields, in order | name, title, company, … | Name, title, company, one direct phone, one website |
| Name | Written as: ___ | The way the person introduces themselves to clients |
| Job title | Capitalisation: ___ Abbreviations: ___ | Sentence case; spell out “Senior” and “Director” |
| Credentials | Allowed: ___ | Only those a client would expect to see, such as a professional licence |
| Phone | Format: ___ | Country code first, with spaces, such as +44 7700 900123 |
| Email address in the signature | Yes or no | Usually no, since it is in the header; yes if you print emails often |
| Website | One link: ___ | Your main site, not a campaign page |
| Social links | Which networks: ___ | Two at most, only those used for work |
| Font | Name and size: ___ | One common font in the body size of your mail app |
| Colours | Text, links, accent: ___ | Text and links at 4.5:1 contrast against the background |
| Logo | File, displayed width: ___ | One hosted image, shown at a fixed width |
| Photo | In, out or optional: ___ | Pick one rule for everyone |
| Banner or promotion | Owner: ___ End date: ___ | One banner at a time, removed on its end date |
| Legal or registration line | Exact text: ___ | Locked, in a footer, small and grey |
| Confidentiality notice | Exact text or none: ___ | Short, and agreed with whoever advises you on legal matters |
| New messages | Version: ___ | Full signature |
| Replies and forwards | Version: ___ | Name, title, direct phone only |
| Mobile | Version: ___ | Same as replies |
| Owner and review date | Name: ___ Date: ___ | Twice a year |
If you leave a row blank, say so in the document and put a date next to it. A blank row with a date is a decision deferred. A blank row with nothing is a loophole.
Why each row looks the way it does
Fields and order. Put them in the order a stranger needs them: who you are, what you do, which company, how to reach you. Most signatures are fine with four to seven lines. The longer the signature, the further the message you wrote slides up the screen.
Name and title. Titles are where inconsistency starts: “Sr. Mgr”, “Senior Manager”, “SENIOR MANAGER”. Choose one style and give two examples in the document. Clients also notice when a title does not match the one on a business card.
Phone. Local formats cannot be dialled from abroad. Use the international form with a country code, and decide whether the company or the person owns the number. Our article on writing a phone number internationally shows the format.
Colours and contrast. The W3C’s Web Content Accessibility Guidelines, in Success Criterion 1.4.3 (Level AA), say normal text should have a contrast ratio of at least 4.5:1, and large text (18 point, or 14 point bold) at least 3:1. That standard was written for web pages, but it is a sensible bar for text in a signature too, and it is easy to check. Check it on the dark background as well. A dark logo on a transparent background can vanish in dark mode, so keep a second logo file for it.
Logo. Fix the file and the displayed width. Host the image on your own site and link to it, instead of pasting it into the signature box. Gmail counts images toward its limit: Google’s signature help page says you can put up to 10,000 characters in a Gmail signature and, if you get an error, to try resizing the image.
Links. One website link is plenty. Every extra link is another thing that goes out of date. If you want to track clicks, decide who owns that and which addresses carry tracking, because people notice long ugly URLs.
Banners. A banner is a campaign, not part of the brand. Give it an owner, a start and an end date. The commonest failure is a banner for an event that finished a year ago, still in forty signatures.
Replies. The Gmail help page, read on 4 October 2026, says you can set different signatures for new emails and for replies, and Outlook has a similar setting (check your version). A short version on replies keeps long threads readable.
Legal and confidentiality lines. If your company has to state a registration number or an address, treat the line as company-owned and locked, not something each person edits. We have separate pages on the UK details and on disclaimer wording. Both are general information, not legal advice.
A worked example
Here are email signature brand guidelines filled in for a made-up company, Harbour Studio, a design agency with thirty people. Yours will differ.
| Area | Harbour Studio’s rule |
|---|---|
| Fields | Name, title, company, one direct phone, website |
| Title | Sentence case; “Head of”, never “Head of the” |
| Phone | International form, mobile preferred, such as +1 415 555 0142 |
| Font and size | Arial, 13 pixels, dark grey text |
| Accent colour | One blue, used for the name and links only; passes 4.5:1 on white |
| Logo | Hosted PNG, displayed at 120 pixels wide; a lighter file for dark mode |
| Photo | Optional, round, head and shoulders |
| Banner | Marketing only, one at a time, always with an end date |
| Legal line | Registered office line in the grey footer, locked |
| Replies | Name, title, phone |
| Owner | Operations manager, reviewed each April and October |
And the result for one person:
|
A compact layout following the Harbour Studio rules. The company and person are made up.
Make the rules easy to follow
Email signature brand guidelines that need a design degree to apply will be ignored. Three things help.
- Ship a template, not just a description. Most people will paste what they are given. Whatever tool you use to build it, the template should already follow the rules.
- Lock what must not change. Admin consoles and some tools let the company fix the legal line and the design. For platform-level options, see the Google and Microsoft sections in the company email signatures guide. A shared-design tool such as emailfooter lets the admin fix the layout, logo, colours and footer and leaves employees only their own details. It does not install anything into mailboxes for them.
- Check, and keep it short. Ask a few people to send you a test message once a quarter, or run a proper email signature audit twice a year. For corporate roles with more formal needs, the corporate email signature page has layouts to start from.
When the rules need to change
Email signature brand guidelines go stale in predictable ways: a rebrand, a move, a new product line, a legal change. Put the owner’s name and a review date at the bottom of the page. When something changes, change the template first, then tell people, then check. Telling people first, without a template ready, leaves them to improvise.
If you are unsure whether your email signature brand guidelines are complete, read three real signatures from different departments and ask whether each could be mistaken for a different company. If yes, the page has gaps.
Frequently asked questions
What should email signature brand guidelines include?
At minimum: the fields and their order, name and title style, phone format, font, colours, logo file and width, rules for photos and banners, the legal line, the version for replies, and an owner with a review date. The table above covers each.
How long should company email signature rules be?
One page. If the rules need more than a page, people will not read them. Put longer reasoning in a separate document and keep the page to answers.
Do email signature standards apply to every employee?
They should, with a short list of agreed exceptions, such as a different job-title style for the legal team. Write the exceptions down, with the reason, so they do not multiply.
Are email signature brand guidelines the same as an email signature policy?
No. Guidelines describe how the signature should look. A policy adds who decides, who enforces and what happens otherwise. Many small companies need only the guidelines, plus a named owner.
How often should I review email signature brand guidelines?
For email signature brand guidelines, twice a year is a reasonable rhythm, and again after any rebrand, move or change of legal details.
Keep reading
- Company email signatures: roll out one consistent signature across your whole team: How to set up a company email signature for every employee: what to fix, what people fill in, four ways to deploy it, a rollout timeline and the limits of each.
- Corporate email signature: a template system a company can roll out: A corporate email signature template works when it says which parts are locked, which each person fills in and which are optional. A spec you can copy.
- Email signature policy: a short template for staff: An email signature policy template you can edit: eleven short clauses covering owner, mandatory content, staff additions, legal lines, leavers and review.
- Email signature audit: a 15-point checklist to find inconsistent signatures: An email signature audit in 15 checks: how to sample senders, what to look at in the message that arrived, and what each failure usually means.
Make every signature in your company match
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