A logo scroller looks simple, but uneven source images and an incorrect loop can make the result jump. The best implementation normalizes display height, preserves each logo’s aspect ratio, and animates two equal presentation groups.
Normalize height, not width
Logos have very different proportions. Set a common maximum or fixed height and let width remain automatic. This avoids stretching square and wide logos into the same shape.
Use meaningful alternative text
If a logo identifies a linked partner, use the partner or brand name as alt text. If the surrounding text already names the brand and the image is decorative, empty alt text can prevent repetition.
Seamless movement
Put the same logo sequence in two adjacent groups and move the combined track by one group width. The second group is a visual duplicate and should be hidden from assistive technology.
Reduced motion
When animation is disabled, show one static group in a wrapped or horizontally scrollable layout. Do not hide all logos simply because motion is turned off.
The Brand Logos Scroller Generator produces this pattern and lets each logo have its own alt text and optional link.