ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
ezgif.com - Ezgif.com is simple online gif maker and toolset for basic animated gif editing.
Bulk Resize Photos - Resize large photos in bulk
Gifox - Delightful GIF Recording and Sharing App for macOS
PQINA Photo Editor - A free, fast, mobile-friendly, online photo editor to quickly edit pictures.
Instagiffer - Create GIFs from anything!