Developer Builds Free Tool to Show YouTube Banner Safe Zones Across Devices

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A developer behind the free tool vidthumb.co has released a browser-based YouTube banner checker after repeatedly receiving user complaints about cropped content on mobile devices. YouTube's official spec asks creators to upload a 2560x1440 px image, but the same file is cropped differently across five device types, including TVs, desktops, tablets, mobiles, and embedded players. The critical safe zones — a 1546x423 px web-safe area and a smaller 1235x338 px TV-safe area — are not prominently documented in YouTube's help pages but can be found in the YouTube Data API v3 reference. The new tool overlays all three crop rectangles on any uploaded banner entirely client-side, requiring no login or server upload. The developer also flagged two silent pitfalls: files over 6 MB are rejected without any error message, and banners in CMYK color profiles can display distorted colors on OLED smart TVs.

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