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Super easy HTML
email signatures

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Office 365 HTML signature size length character limit

Does Office 365 have a character, size, length limit in it's HTML signature settings?

IMPORTANT: Update 31st August 2016. We tested installing our email signatures directly into Outlook Office 365 today and there is no more character limit! You can now install your email signatures directly into Outlook Office 365 and there is no need to use our Browser Extension. You can now install your email signatures directly into Outlook Office 365, following this guide.

Yes, Office 365 does have a character, size, length limit in it's HTML signature settings. This has been confirmed by Office 365 support in this post on their support forum.

What is the size, character, length limit in Office 365?

The size limit is 8kb.

What is Office 365's official response to the size limit in Office 365?

Posted by Kevin Cui, on 14th January 2013

"The signature size limit is 8 kb for html and text signature and currently could not be changed. Based on current situation, to better meet your requirements, I suggest you submit feedback via the following link.

Submit Feedback

The new features releases often originate from customer’s feedback. In the feedback description, please specify your situation and requirement in detail. In addition, we welcome you to keep your eye on the forum for any updates on the features that you are concerned about. Your efforts and patience are highly appreciated.

How to install a signature in Outlook Office 365 without any limitations on characters

We now support Outlook Office 365 (BETA).

Install our new Outlook Office 365 Email Signature Rescue Browser Extension. No more character limits!

Everything you need to create, customize, manage and deploy HTML email signatures.

No Design Skills

No design skills required. Your signatures will look as beautiful as our examples. 20 easy to customize templates included.

No Tech Knowledge

Whether you’re a solo business owner, hairdresser, real estate agent or dog walker, anyone can create and install a signature!

Works With

Install in nearly all major email clients including Gmail, Apple Mail, Outlook, iOS and more. 50+ email clients, apps and software supported.

Reliable & Tested

We refine our HTML code and conduct extensive testing regularly to ensure it is industry-leading and works across all major email clients.

Save Time

Create, customize, edit, manage and deploy HTML email signatures from one central, easy to use system.

Save Money

No expensive IT staff, developers or designers needed. From signature design, to installation and support, we take care of it all.

Easy Duplication

10, 20, 30 or 100 staff? No worries! Duplicate signatures you’ve already created from the Dashboard to create multiple signatures quickly.

Support if you need it

Hit a snag? Help is only an email away. We're here for help with any design, installation and technical issues, should you need us.

Email Signature Software for Businesses and Designers.