Steam showcase and avatar sizes

The pixel sizes the Artwork Maker and Avatar Cropper use, and the file limits Steam sets.

Sizes

ShowcasePiecesUpload sizeDesign at
Workshop showcase5158×450 each800×450, 2 px gaps
Workshop, 2 rows10150×210 each770×429, 5 px gaps, 9 px between rows
Workshop, 3 rows15150×194 each770×600, 5 px gaps, 9 px between rows
Artwork showcase2506×300 and 100×300615×300, 9 px gap
Featured Artwork showcase1630×360630×360
Avatar1184×184Square crop

Things to know

Make showcase pieces

Questions

What size is the Steam Workshop showcase?
Five pieces of 158×450 each. Make the design at 800×450 and cut it into five, leaving 2 px gaps where Steam puts space between them.
Can a Workshop showcase have more than one row?
Yes. Each Workshop showcase upgrade from the Points Shop adds a row of five, up to three rows. Two rows take ten 150×210 pieces from a 770×429 canvas, and three rows take fifteen 150×194 pieces from 770×600. Upload them left to right, top row first.
What size is the Steam Artwork showcase?
A wide piece of 506×300 and a thin strip of 100×300. Together they come from a 615×300 canvas with a 9 px gap between the two.
What size is the Featured Artwork showcase?
630×360, as one piece.
What size should a Steam avatar be?
184×184. Steam accepts PNG and JPG avatars up to 1 MB.
What is the maximum file size for Steam artwork?
5 MB per file, for both artwork and Workshop uploads.