Image Rotator
Rotate your images by 90, 180, 270 degrees or any custom angle directly in the browser. Upload an image, select the rotation angle, preview the result, and download instantly. Runs in your browser — images are never uploaded.
How Image Rotation Works
Image rotation transforms every pixel in an image by repositioning it around a central point by a specified angle. This tool uses the HTML5 Canvas API to perform the rotation. For standard angles like 90, 180, and 270 degrees, the canvas dimensions are swapped appropriately (width becomes height and vice versa for 90 and 270 degree rotations) to ensure the entire image fits without any cropping. For custom angles, the canvas is expanded to accommodate the rotated image, and the background is filled with transparency.
The rotation process is entirely local. Your browser handles all the pixel transformation using the Canvas 2D context's rotate and translate methods. No image data is ever sent to a server, making this tool completely private and safe for any type of image content.
Rotation Mathematics
90° Clockwise: New width = original height, New height = original width
180°: Dimensions remain the same, image is flipped both horizontally and vertically
Custom Angle: Canvas expands to fit the rotated bounding box
For arbitrary angles, the new bounding box is calculated using: W' = |W×cos(θ)| + |H×sin(θ)| and H' = |W×sin(θ)| + |H×cos(θ)|
Common Use Cases for Image Rotation
Image rotation is frequently needed to correct photos taken in the wrong orientation, especially from mobile devices where EXIF orientation data may not be read correctly by all applications. It is also useful for creating diagonal text effects, adjusting scanned documents that were placed at an angle, and preparing images for specific layout requirements in design projects.
Lossless vs Lossy Rotation
Rotating by exact multiples of 90 degrees is effectively lossless because pixels map one-to-one to their new positions. Custom angle rotation involves interpolation, where new pixel values are calculated from neighboring pixels, which can introduce a small amount of softening. For most practical purposes, this softening is imperceptible, but it is worth noting if you are performing multiple successive rotations on the same image.
Privacy and Security
All image processing happens entirely in your browser. Your files are never uploaded to any server, making this tool completely safe for personal photos, confidential business graphics, and sensitive documents.