Automatically Use a Picture in a Thunderbird Signature

Customize your thunderbird email signature with a photo

Email signatures are an easy way to sign or identify yourself automatically in an email message. It's also a great way to promote a business or product. The Mozilla Thunderbird email client makes it easy to attach an image to your signature.

You can edit your Thunderbird email signature each time you compose a new message. This means you can change your signature image 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 shows up when you write a new message, delete everything in the body of the message.

  2. Build the signature to your liking (including the text that should be included).

    You can link the image to a website. Double-click the picture to open a link window or, when you insert the picture, place a URL in the Link tab of the Image Properties window before selecting OK.

    A Signature in Thunderbird
  3. Place the cursor on a new line and select Insert > Image to add a picture to the body.

    The Insert Image command in Thunderbird
  4. Select Choose File and choose an image from your computer.

    The Choose File button
  5. Select OK to place the image.

    Either enter descriptive text in the Alternate Text bar, or select Don't Use Alternate Text.

    The OK button
  6. Drag the handles to resize the image if needed.

    Resizing handles
  7. Select File > Save As > File.

    If you don't see the menu bar, press the Alt key.

    The "Save As File" command
  8. Before saving the image, make sure Format is set to HTML.

    The HTML Files Format
  9. Choose a name for the file and save it.

  10. Close the new message you created. You don't have to save the draft.

  11. Select Tools > Account Settings from the menu bar.

     If you don't see the menu, press the Alt key.

    The Account Settings item
  12. Select the email address in the left pane for any account that should use the custom email signature.

  13. Go to the bottom of the Account Settings window, then select the Attach the signature from a file instead (text, HTML, or image) check box.

    This option disables any signature text that was included in the section above. If you want to use the text from that area, copy and paste it into your signature file from above and then re-save it to the HTML file before proceeding.

    The "Attach from a file instead" option
  14. Select Choose to find and select the HTML file that you saved in Step 5.

    The Choose button
  15. Navigate to the HTML file you saved, and select Open.

  16. Close the Account Settings window.

  17. When you start a new email, the signature appears automatically.

    A signature automatically populating an email in Thunderbird