Rotate Image

Rotation is done with a canvas transform. The drawing origin is moved to the centre of the output, rotated by the angle you chose, optionally mirrored by scaling an axis negatively, and the image is then drawn centred on that origin. Composing the transforms this way means rotate-then-mirror behaves predictably instead of producing the surprising results you get from applying them separately.

A quarter turn swaps the output dimensions: a 4000×3000 photo becomes 3000×4000. The canvas is sized accordingly before drawing, which is why nothing is cropped.

There is a hidden cause worth knowing about. Phones do not rotate the pixels when you turn the handset — they write an orientation tag into the EXIF block and leave the image as the sensor captured it. Software that honours the tag shows the photo upright; software that ignores it shows it sideways. That is why a picture can look correct on your phone and wrong once uploaded.

This tool applies that tag during decoding and then bakes your rotation into the actual pixels. The saved file is upright everywhere, with no tag to misinterpret — which is the real fix rather than a display-time workaround.

You took receipt.jpg holding the phone sideways. It looks fine in your gallery, but when you attach it to an expense claim the preview shows it rotated 90° counter-clockwise.

Choose the file. The preview already shows it upright, because the tool honours the orientation tag your gallery was using and the claim system was ignoring. This is the moment the cause becomes obvious: the photo was never really upright, it was only being displayed that way.

If the preview looks correct, you do not need to rotate at all — just download. The saved copy has the rotation baked into the pixels rather than described in a tag, so the claim system will show it the same way your gallery did.

Now a case that does need a turn: a document scanned upside down. Press ↻ Rotate right twice, or once more if you overshoot — the status line tracks the total, and the dimensions in the header swap on the odd turns and swap back on the even ones.

The mirror buttons are for a different job: reversing a photo taken through a front camera, or a scanned transparency that came out reversed. Mirroring is not rotation, and applying both is fine — the preview shows the combination live.

If the file is bigger than it needs to be after saving, compressing it is the next step.