The gap between a logo that looks great on a presentation slide and one that holds up at 16×16 pixels is bigger than most people expect. Symbl makes that gap visible.

Upload your logo mark and it renders it across the full range of real-world contexts: favicons, app icons, social avatars, print sizes. It checks readability, contrast, and visual weight at each scale so you can spot problems before they ship.

It's a small, focused tool — no account required, no subscription. The kind of thing you open once during a brand review and it saves you from discovering the favicon problem three months after launch.