Optimizing image specifications for your edition

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Tips on optimal image specifications for logos, banners, featured and inline images.

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Adding your own images is a great way to bring your brand and personality into your newsletters. Of course, you always have the Axios Visuals library, Unsplash Stock Photo library, and the AI image generator at your disposal, but here are our optimal import specs for your banners, logos, and image uploads.

Table of Contents:

  1. Wide Logo
  2. Square Logo
  3. Banner
  4. Featured Image
  5. Inline Image
  6. Image Collage

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We recommend a 4:1 ratio for all wide logo uploads. These are added on the Series settings tab for each newsletter series in the Design section. You can also upload a banner directly in your intro card. 

Optimal Specs:

  • 800×200 px

  • 72 ppi

  • PNG file type

  • Less than 1 MB

Acceptable Specs:

  • 400×100 px — a smaller file size and lower quality when zoomed in

  • 1600×400 px — a larger file size and higher quality when zoomed in

  • JPG file type


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We recommend a 1:1 ratio for all square logo uploads. To apply the same logo to each new edition, upload your logo in the Series Settings > Design tab. To apply a different logo to a specific edition, upload your logo directly in the logo section in the intro card.  

Optimal Specs:

  • 800×800 px

  • 72 ppi

  • PNG file type

  • Less than 1 MB

Acceptable Specs:

  • 400×400 px — a smaller file size and lower quality when zoomed in

  • 1600×1600 px — a larger file size and higher quality when zoomed in

  • JPG file type


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Banners must have an exact 4:1 aspect ratio and be less than 2.5 MB in file size. To apply the same banner to each new edition, upload your banner in the Series Settings > Design tab. To apply a different banner to a specific edition, upload your banner directly in the banner section in the intro card. Note: Gifs cannot be used for banner images. 

Optimal Specs:

  • 2400×600 px

  • 72 ppi

  • PNG file type

Acceptable Specs:

  • 1600×400 px

  • 800×200 px — a smaller file size and lower quality when zoomed in

  • JPG file type

Troubleshooting: If you receive an error indicating the size of your banner is incorrect, double check the dimensions of your saved image by opening it in your computer (separate from HQ) and looking at the properties.

  • On a Mac, click the Inspector button on the toolbar to pull up General Info and find the Image Size.

  • On a PC, right click your image and select Properties. In the window that opens, navigate to the Details tab to find the Dimensions.

Occasionally, an image will save one pixel over or under the necessary spec. This can be fixed by adjusting your image settings when saving the image, or compensating for the discrepancy by intentionally adding or removing a pixel at the time of the save!


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Featured images are uploaded within the editor for each card, immediately following your card headline and above your content. These span the full width of your card and newsletter and are a great way to break up large blocks of text. These can also be saved to your Uploads tab to be accessed again later by checking the “Save to Uploads” box on your upload screen.

We recommend a 5:3 aspect ratio for featured images. For a thinner, banner-like image, we recommend using an 8:1 aspect ratio.

Optimal Specs:

  • 1000×600 px

  • 72 ppi

  • PNG file type

  • Less than 1 MB

GIF and JPG file types will also work. For every featured image, keep in mind the following resolution guidelines:

  • Minimum 72 ppi

  • Maximum 300 ppi

  • Less than 20 MB

5. Inline Image

[Test] Copy of Optimal Image Specs - kaleo-nakakura@axioshq-com - Axios HQ Mail 2024-06-13 at 2-31-08 PM-jpg.webp

For inline images, any ratio or dimension will work, and you can resize and center-align them in the body of each card. Inline images are also a great way to add multiple images per card.

Optimal Specs:

  • PNG file type

  • Minimum resolution 72 ppi

  • Maximum resolution 300 ppi

  • Less than 1 MB

GIF and JPG file types will also work.


6. Image Collage

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You can create an image collage and use it as the featured image or include it within the text of a card. You have two image collage options to choose from: side by side or a 2x2 grid. 

Image dimensions:

  • For the side by side, aim for 296px by 296px or a 1:1 width-to-height ratio.
  • For the 2x2 grid, aim for 298px by 170px or a 7:4 width-to-height ratio.

Pro-tip: Use the cropping tool to resize your image to 1:1 or 7:4 ratio. (See gif above) 

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