How to Add Signature in Thunderbird – Complete Walkthrough

  Mohit Kumar Jha
Written By Mohit Kumar Jha
Anuraag Singh
Approved By Anuraag Singh  
Modified On November 13th, 2025
Reading Time 5 Minutes Reading

If you are a working professional, then having a customized email signature makes your messages look more attractive. Additionally, using Thunderbird as your email client then knowing how to add a signature in Thunderbird can help you create a more professional impression. In this article, I will walk you through how to add signature in Thunderbird step by step.

Why Create Email Signature in Thunderbird?

Creating an email signature in Thunderbird saves you from typing the same details every time you send a message to different individuals:

  • It makes you look organized and dependable to the people you email.
  • For professionals, it helps in maintaining brand image; for individuals, it adds a personal touch.
  • You can include important details like your contact, job title, or website link.
  • A clean and well-designed signature also leaves a positive impression, showing that you care about clear communication and professionalism in every email.

Also read: Import PST File to Thunderbird

How to Add Signature in Thunderbird

Let’s dive into the steps to add a signature, whether you want to add plain text or a stylish HTML design:

#Step 1: Open Account Settings

Open the Thunderbird app and click on the Menu at the top right corner. From the dropdown, select Account Settings. Here you see the setup options, and you can manage your email preferences.

#Step 2. Select the Account

In the left panel, choose the email account in which you want to add a signature, and Thunderbird gives you the privilege to add a different signature for multiple accounts.

#Step 3. Type or Paste Your Signature

Under your selected account, find the Signature Text box. There, you can type your signature directly. If you want to include links, bold texts, or colors, you can use HTML formatting or attach a prepared HTML file for a more attractive look.

#Step 4. Attach a Signature File

If your email client provides a signature template, or you have designed your own, check the box that says “Attach the signature from a file instead,” and select the saved file. Thunderbird supports “.txt” and”.html” formats.

#Step 5. Save and Test

After doing all the above steps, close the Account Settings window. Your changes will save automatically. Open a new message window to confirm your signature appears as desired. Whoo! You have successfully learned how to add a signature in Thunderbird.

Here is the quick step by step visual to add the signature:

Steps to Delete Signature in Thunderbird

Deleting a signature in Thunderbird is just as easy as adding one.

  1. Go to Menu < Account Settings
  2. Select the account that contains your existing signature.
  3. In the Signature text box, simply remove the text you previously added.
  4. If you have used a file-based signature, uncheck “Attach the signature from a file instead.
  5. Simply close the window, and Thunderbird will save your changes automatically.

From now on, the signature won’t appear while creating a new message. For the future if you want to add the signature again, you can follow the easy steps mentioned above.

Related article: Import Zimbra Emails to Thunderbird Account

Some Best Practices for Thunderbird Signature Setup

While following the steps of Thunderbird signature setup, make sure to keep your signature short, clear, and visually professional. Avoid adding unnecessary quotes, large images, or multiple colors. 

Make sure the contact details are correct, and update your signature whenever you change your information. If you include a company or brand logo, always keep it small. You are also able to add clickable links to your social media profile icon to make your emails more engaging.

For business users, maintain a balance across all team members by using a common standardized HTML template. Always double-check your signature on desktop and mobile before finalizing.

Lastly, back up your Thunderbird profile regularly. Before you migrate or reinstall Thunderbird, tools like SysTools Thunderbird Converter can help store your email data and signature files securely.

Final Thoughts

By this time, I am pretty sure that you know how to add signature in Thunderbird. You can create customized, professional emails in just a few clicks. You can make simple text or HTML designs in your signature, as Thunderbird gives you the privilege to match your style. It doesn’t matter if you are using a signature for business or professional use, it makes sure that your email always ends on a professional or polished note.

FAQs

Q. Can I create a different signature for each Thunderbird account?
Yes, you can do that, as Thunderbird gives you the privilege to set a unique signature for each email account you manage.

Q. Can I include an image or logo in my signature?
Yes, you can include images or logos in HTML format.

Q. Why isn’t my signature showing up in emails?
It might be possible that you have enabled the Attach Signature.

Q. Can I automatically add signatures to replies and forwards?

Yes, Thunderbird allows automatic signatures in both new messages and replies through Account settings.

  Mohit Kumar Jha

By Mohit Kumar Jha

With 6+ years of experience, Mohit is a Microsoft Certified expert known for his expertise in cloud migration, cybersecurity, and digital forensics. He specializes in Microsoft 365, Exchange Server, and Azure AD migration. Mohit's insights are drawn from extensive practical experience and rigorous testing of the methods and tools discussed, ensuring accurate and actionable guidance for users. As a tech writer, researcher, and editor, he delivers reliable, accurate, and expert-backed insights you can trust.