Question 1

Why are 90-degree rotations lossless but other angles aren't?

Accepted Answer

Rotating a pixel grid by an arbitrary angle requires mapping each output pixel to a position that falls between input pixels, then interpolating the color value. Rotations by exactly 90, 180, or 270 degrees are special cases — they simply rearrange existing pixel values without any interpolation, which is why they are perfectly lossless. Any other angle necessarily involves approximation that introduces slight softening.

Question 2

What is the difference between rotating and flipping?

Accepted Answer

Rotation turns the image around its center by a fixed angle (90, 180, or 270 degrees). Flipping mirrors the image along an axis — horizontal flip swaps left and right, vertical flip swaps top and bottom.

Question 3

Can I apply multiple transforms in a row?

Accepted Answer

Yes. Each button applies its transform to the current result, so you can chain operations freely — for example, rotate right then flip horizontally. Click Reset at any time to return to the original image.

Question 4

Does rotating change my image quality?

Accepted Answer

The tool preserves your original format and uses high quality settings (95% for lossy formats). For PNG files the output is lossless. Repeated transforms on lossy formats may introduce minimal re-encoding artifacts, but for typical use the difference is imperceptible.

Image Rotate & Flip

About this tool

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