Table of Contents

Rotate, Flip, and Auto-Orient

Orientation issues usually show up the first time a phone photo looks rotated even though the file came straight from a camera roll. This page covers the small set of operations you will use most often to normalize orientation metadata or apply explicit geometric transforms.

The most common entry points are AutoOrient(), Rotate(), Flip(), and RotateFlip().

Correct Orientation from EXIF Metadata

Use AutoOrient() early in your pipeline to normalize images captured by cameras and phones:

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

using Image image = Image.Load("input.jpg");

image.Mutate(x => x.AutoOrient());

AutoOrient() uses embedded EXIF orientation metadata when it is present. This is often the right first processing step for user-uploaded photos.

Rotate by a Known Angle

Use Rotate() to rotate by a specific number of degrees or a known rotate mode:

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

using Image image = Image.Load("input.jpg");

image.Mutate(x => x.Rotate(90));

ImageSharp also supports RotateMode when you want a predefined quarter-turn rotation.

Flip Horizontally or Vertically

Use Flip() to mirror the image:

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

using Image image = Image.Load("input.jpg");

image.Mutate(x => x.Flip(FlipMode.Horizontal));

See FlipMode for the available options.

Combine Rotation and Flipping

Use RotateFlip() when you need both operations together:

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

using Image image = Image.Load("input.jpg");

image.Mutate(x => x.RotateFlip(RotateMode.Rotate90, FlipMode.Vertical));

This can make intent clearer than chaining separate calls when the final transformation is a single orientation step.

Normalize Orientation Before Resizing

In most workflows, orient the image before cropping or resizing:

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

using Image image = Image.Load("input.jpg");

image.Mutate(x => x
    .AutoOrient()
    .Resize(1200, 800));

That keeps downstream dimensions and crop coordinates aligned with the final visual orientation.

Practical Guidance

  • Call AutoOrient() early for user-uploaded photos unless preserving raw pixel orientation is intentional.
  • Normalize orientation before crop and resize operations based on what a person sees.
  • Strip or update orientation metadata only after the pixel data reflects the intended display orientation.
  • Test orientation workflows with real phone images, not only images already stored upright.
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