Paste the following code and press : $J('#image_width').val('1000'); $J('#image_height').val('1');

You must convert your .mp4 to a .gif . To maintain quality, use high-end tools like Adobe Photoshop or After Effects .

If you are using an .mp4 file (like the one in your query), you are likely attempting to create an .

Use Steam.Design to automatically crop your Steam backgrounds into the correct dimensions. 2. The "Long Image" Upload Hack

Before uploading, you must ensure your image or GIF meets the specific Steam layout dimensions.

For very long GIFs, some users use HxD (a Hex Editor) to manually change the "height" metadata of the file so Steam's servers don't reject the file size.

Steam's default uploader will square off long images unless you use a specific console command during the upload process. Open your browser (Chrome or Firefox) and log into Steam. Navigate to the page.

Must be exactly 630 pixels for a single large showcase, or divided into five 119-pixel columns for a standard Workshop showcase.