What is Rotate Image Online?
Rotate Image Online turns your images by any angle you need. Use quick buttons for 90°, 180°, and 270° rotations, or enter a custom angle for precise straightening. Photos taken on phones often have incorrect EXIF orientation data — they look right on the phone but display sideways on computers and websites. This tool fixes that by physically rotating the pixel data, not just updating metadata. It handles JPEG, PNG, WebP, and AVIF files. Photographers use it to straighten horizon lines. Document scanners use it to correct page orientation. Web developers use it to fix images that display rotated in browsers that ignore EXIF rotation tags. The tool processes everything locally — your images never leave your device.
Rotate Image Online Formula
The rotation engine applies affine transformation to your image pixels with anti-aliased output.
Angle Input
You specify a rotation angle in degrees. 90°, 180°, and 270° rotations are lossless — pixels are remapped without interpolation. Custom angles between these values require subpixel sampling.
Affine Transformation
The tool calculates a 2D rotation matrix and applies it to every pixel coordinate. For cardinal rotations (90°/180°/270°), this is a direct coordinate swap. For arbitrary angles, bicubic interpolation fills in subpixel positions to produce smooth output.
Canvas Resize & Output
Non-90° rotations produce a larger bounding box than the original image. The tool either expands the canvas to fit the rotated image or crops to the largest inscribed rectangle, depending on your preference. The result is encoded in your chosen format.