> ## Documentation Index
> Fetch the complete documentation index at: https://help.sendspark.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Adjust the Thumbnail's Size in Lemlist

> 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.

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.

<iframe src="https://www.youtube.com/embed/StRy3gsPs-g?rel=0" allow="autoplay; fullscreen; picture-in-picture; encrypted-media" allowFullScreen />

## 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.

## 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.

2. **Inserting the Thumbnail:**

* Paste the thumbnail code into your email body. By default, it might appear too large for the email layout.

3. **Switching to Code View:**

* If you don't see the code view toolbar, click on the three dots menu and select "Code View."

4. **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.

5. **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.

## 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!

## Frequently asked questions

<AccordionGroup>
  <Accordion title="Why does my thumbnail look too big when I paste it into Lemlist?">
    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.
  </Accordion>

  <Accordion title="How do I open Code View in Lemlist?">
    In the email editor, if you don't see the code view toolbar, click the three-dots menu and select "Code View."
  </Accordion>

  <Accordion title="What width should I use for the thumbnail?">
    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.
  </Accordion>

  <Accordion title="How do I check the thumbnail looks right before sending?">
    After resizing, use the preview option to view the email layout with the adjusted thumbnail and confirm it fits your campaign's design.
  </Accordion>
</AccordionGroup>

## Related articles

* [Lemlist — Send Personalized Videos at Scale](/lemlist-send-personalized-videos-at-scale)
* [Lemlist — Send Dynamic Videos](/lemlist-send-dynamic-videos)
* [How to Edit Video Thumbnails](/how-to-edit-video-thumbnails)
* [How to Upload a Custom Video Thumbnail](/how-to-upload-a-custom-video-thumbnail)

*Updated July 2026.*