ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
Bulk Resize Photos - Resize large photos in bulk
ImprovedTube - Allows you to improve and enhance Youtube visually or enable dozens of new features permanently or...
PQINA Photo Editor - A free, fast, mobile-friendly, online photo editor to quickly edit pictures.
Iridium by ParticleCore - Iridium is an extension built to improve the user experience on the new YouTube Material layout.