Thumbnails Guides

Exact dimensions, aspect ratios, and export settings for YouTube, Shorts, and Instagram thumbnails—with quick presets and quality checks.

Keep your thumbnail text readable across all devices by positioning it inside safe zones—with practical margin guides, platform-specific overlays, and real-device validation using Thumbnail Resizer.

Make thumbnail text readable on any feed with practical contrast targets, safe-area framing, and fast fixes using Thumbnail Resizer and Contrast Checker.

Design your thumbnail once, then export perfect 16:9, 9:16, and 1:1 versions without rework using presets, safe-area guides, and consistent framing.

Build high-contrast color combinations that survive compression and platform overlays using Contrast Checker, plus workflows to keep edges clean on every export.

Build stroke, shadow, and highlight-plate stacks that keep thumbnail text readable on every feed using Contrast Checker plus fast mobile checks.

Validate thumbnail contrast on real phone and tablet previews so hooks survive upload compression using a Capture > Simulate > Verify workflow.

Understand WCAG contrast standards and apply them to thumbnail text—with ratio targets, text size thresholds, and validation workflows using Contrast Checker.