Image Rotator & Flipper
Straighten a scan, fix a sideways phone photo, or mirror an image — without it leaving your device.
Use this to straighten a crooked scan or horizon. The canvas grows to fit the rotated image.
What the image Rotator & Flipper does
Rotation sounds trivial and has one detail that catches people out: what happens to the corners. Turn a rectangle by anything other than a multiple of 90 degrees and it no longer fits in a rectangle of the same shape, so the canvas has to grow and the newly exposed corners have to be filled with something.
This tool calculates the bounding box of the rotated image and resizes the canvas to match, so nothing is ever clipped off. The exposed corners are transparent by default, which is right when you are saving as PNG and want to composite the result over something else. Untick that and pick a colour when you are saving as JPEG, which has no transparency and would otherwise render those corners black.
The quarter-turn buttons are lossless in the sense that matters: pixels are moved, not resampled, so a 90-degree rotation followed by another 270 gets you back exactly where you started. Fine rotation is different — any angle that is not a multiple of 90 requires interpolation, so each pass softens the image very slightly. Straighten once from the original rather than nudging repeatedly.
Flipping is a mirror, not a rotation, and the two are not interchangeable. Flipping horizontally then rotating 180 degrees gives a vertical flip, which is occasionally a useful shortcut. Note that flipping any image containing text or a logo produces something that reads backwards; use it for symmetry and composition, not to make a photo “face the other way” when it contains writing.
How to use it
- Drop in the image you want to turn.
- Use the quarter-turn buttons for a sideways photo — those are the lossless ones.
- Use fine rotation to straighten a crooked horizon or scan, in a single pass from the original.
- Choose a corner colour if you are saving as JPEG, then download.
A worked example
A 4032 × 3024 photo that came off a camera sideways:
| Action | Output size | Corners |
|---|---|---|
| Rotate right 90° | 3024 × 4032 | None exposed — the box just swaps |
| Fine rotate 3° | 4230 × 3227 | Four triangles exposed |
| Rotate 90° then fine 3° | 3227 × 4230 | Four triangles exposed |
The middle row is the one worth understanding. Straightening by only three degrees grew the canvas by about 200 pixels in each direction, and every one of those new pixels is background rather than photograph. That is why straightening is usually followed by a crop — use the Resizer & Cropper to trim back to a clean rectangle afterwards.
Frequently asked questions
Does rotating an image lose quality?
Quarter turns do not — pixels are relocated, not resampled, so 90 degrees four times returns the exact original. Any other angle requires interpolation and softens the image slightly, so straighten once from the original rather than in several nudges.
Why does my rotated image have black corners?
Because you saved it as JPEG, which cannot store transparency, so transparent corners render as black. Untick Keep corners transparent and choose a fill colour, or save as PNG instead.
Can this fix a photo that shows sideways on my phone but correctly on my computer?
Yes, and it fixes it permanently. That problem is caused by an EXIF orientation flag that some software honours and some ignores. Rotating here bakes the correct orientation into the pixels and drops the metadata, so every viewer agrees.
What is the difference between flipping and rotating 180 degrees?
A 180-degree rotation turns the image upside down; a horizontal flip mirrors it left to right. They look similar on a symmetrical subject and completely different on anything with text, which reads backwards after a flip.