Automatically Use a Picture in a Thunderbird Signature

Customize Your Thunderbird Email Signature With a Photo

Close-Up Of Fountain Pen On Paper
Matteo Reggiani / EyeEm / Getty Images

Email signatures are an easy way to show who you are and even advertise your business or product without much effort, in every single email. The Mozilla Thunderbird email client makes it easy to attach an image to your signature.

The good thing about email signatures is that you can edit them each time you compose a new message. This means even if you love your image signature, you can still change it or remove it for different scenarios.

Add an Image to Your Mozilla Thunderbird Signature

With Thunderbird open and ready to go, follow these steps:

  1. Compose a new, empty message using HTML formatting.
    If a signature is already showing up when you write a new message, just delete everything in the body of the message.
  2. Build the signature to your liking (including any and all text that should be included), and use the Insert > Image menu within the message to put a picture into the body. Resize as needed.
    Tip: You can even link the image to a website. Double-click the picture to do this or, when you insert the picture, before clicking OK, put a URL in the Link tab of the Image Properties window.
  3. Access the File > Save As > File... menu option.
    Tip: If you don't see the menu bar, hit the Alt key.
  4. Before saving the image, make sure the Save as type option is set to HTML.
  5. Choose a name for the file (like "signature.html") and click Save to store it somewhere recognizable.
  1. Close out of the new message you created; you don't have to save the draft.
  2. Access Tools > Account Settings from the menu bar (you can hit the Alt key if you don't see the menu).
  3. Click the email address in the left pane for any account that should use the custom email signature.
  4. On the right page, toward the bottom of the Account Settings window, put a box in the option called Attach the signature from a file instead (text, HTML, or image):.
    This option will immediately disable any signature text that was included in the section just above this option. If you want to use the text from that area, be sure to copy/paste it into your signature file from above and then re-save it to the HTML file before proceeding.
  1. Click the Choose... button next to that option to find and select the HTML file that was saved in Step 5.
  2. Click Open to select the signature file.
  3. Click OK in the Account Settings window to save the changes.