topic Re: Thumbnail Size in ArcGIS Online Questions

Thumbnail Size

ebrays — Thu, 26 Jun 2025 16:27:17 GMT

Hi - does anyone know AGOL's new thumbnail sizing?

Since the June update last night the 600x400 pixel custom thumbnail templates I've made don't fit now and being a real pain trying to guess and get my thumbnails to fit properly. Can't find recent documentation on correct sizing. Or any advice.

Thanks!

Re: Thumbnail Size

Joshua-Young — Thu, 26 Jun 2025 16:39:27 GMT

The new ratio appears to be 400x400 pixels, so now all our thumbnail images have to be squares.

Re: Thumbnail Size

StephanieW — Thu, 26 Jun 2025 17:41:01 GMT

Hi @ebrays this was documented as BUG-000177465: Following the ArcGIS Online June 2025 update, an item's thumbnail now defaults to 400 x 400 pixels when it used to be 600 x 400 pixels and is under review.

Re: Thumbnail Size

ebrays — Fri, 27 Jun 2025 09:54:09 GMT

Haha the answer was right in front of me! Thanks Joshua

Re: Thumbnail Size

ebrays — Fri, 27 Jun 2025 10:19:15 GMT

Thank you Stephanie