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What is the best size and format for images

Updated this week

The best practice for websites is to ensure you have images that are suitable for viewing on both website and mobile. Not having device-optimized imagery can not only irritate your website users, but also harm your search engine ranking.

Conversion Wax content enables you to upload images for desktop, tablet and mobile, but, we’ve also been smarter than that…

When you use content created on our platform, Conversion Wax will automatically select a size and format that best suits your user demographic.


This includes converting images to SVC files - this is google’s preferred image format - as well as automatically re-sizing images depending on device type.

If you want to optimize your images ahead of adding them to Conversion Wax, then take a look at our handy guide below to help you:

Website image type

Desktop image dimensions

Mobile image

Aspect ratio

Background image

2560px x 1400px

360px x 640px

16:9

Hero image

1280px x 720px

360px x 200px

16:9

Website banner

1200px x 400px

360px x 120px

3:1

Blog image

1200px x 800px

360px x 240px

3:2

Lightbox image

1920px x 1080px

360px x 640px

16:9

Thumbnail

300px x 300px

90px x 90px

1:1

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