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To resize a Sendspark thumbnail in Lemlist, paste the thumbnail code into your email body, switch to Code View (via the three-dots menu if the toolbar is hidden), find the thumbnail’s width attribute, and change it — width="50%" makes it half size, width="30%" smaller still. Preview to confirm it fits your email layout.

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Key takeaways

  • By default, a pasted thumbnail may appear too large for the email layout — you resize it in Code View.
  • If the code view toolbar isn’t visible, open it from the three-dots menu and select “Code View.”
  • Find the thumbnail’s width attribute in the code and change it: width="50%" is half size, width="30%" is smaller still.
  • Preview the email after resizing to check the thumbnail is proportional and fits your campaign layout.

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How to Adjust a Thumbnail in Lemlist

Step by step guide on how to adjuste a thumbnail in Lemlist to fit perfectly into your email campaigns.
  1. Accessing the Email Editor:
  • Log into your Lemlist account and navigate to the email editor where you want to adjust the thumbnail.
  1. Inserting the Thumbnail:
  • Paste the thumbnail code into your email body. By default, it might appear too large for the email layout.
  1. Switching to Code View:
  • If you don’t see the code view toolbar, click on the three dots menu and select “Code View.”
  1. Editing the Thumbnail Size:
  • Locate the <h> reference in the code where your thumbnail is inserted. Adjust the width attribute to resize the thumbnail accordingly.
    • For example, setting width="50%" will make it half the original size, while width="30%" will reduce it further.
  1. Previewing and Finalizing:
  • Switch back to the code view to see how the thumbnail looks after resizing. Use the preview option to view the email layout with the adjusted thumbnail.

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Tips for Optimal Thumbnail Size:

  • Proportionality: Ensure the thumbnail size is appropriate for the email format to maintain visual balance.
  • Testing: Experiment with different width percentages (e.g., 50% or 30%) to find the ideal size that suits your campaign’s aesthetic.
Adjusting thumbnails in Lemlist is a straightforward process that enhances the visual appeal of your email campaigns. By resizing thumbnails to fit the email layout, you can create more engaging and professional-looking communications. If you have any questions or need further assistance, feel free to reach out to our support team. Have a great day!

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Frequently asked questions

By default the thumbnail code can render larger than your email layout allows. You adjust it in Code View by editing the width attribute where the thumbnail is inserted.
In the email editor, if you don’t see the code view toolbar, click the three-dots menu and select “Code View.”
Experiment with different width percentages to find the right fit. Setting width="50%" makes the thumbnail half its original size, and width="30%" reduces it further. Aim for a size that’s proportional to your email format.
After resizing, use the preview option to view the email layout with the adjusted thumbnail and confirm it fits your campaign’s design.
Updated July 2026.