WebP thumbnails beat JPEG at 1280x720 but lose at 480x360 for newer YouTube videos

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A developer analyzed 1,000 YouTube videos on September 19, 2026, comparing JPEG and WebP thumbnail file sizes across three resolutions. At 1280x720 and 640x480, WebP thumbnails were roughly half the size of their JPEG counterparts, offering clear bandwidth savings. However, at the commonly used 480x360 resolution, WebP files were larger than JPEGs for 33% of all sampled videos overall. The disparity was sharper among recent uploads, where WebP was heavier 56% of the time, rising to 72% for videos uploaded in 2026. The study notes that file size alone does not indicate image quality, and the cause of the growing size gap in newer uploads remains unexplained.

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ProgrammingDEV Community ·

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