I rotated my transparent logo at an angle and got white corners; how do I keep the background transparent?

Where the corners come from

Turn a rectangle by anything other than a right angle and it needs a bigger canvas to show in full, which leaves triangles around it that the logo does not cover. The tool has to put something there: either a color, white by default, or transparency.

The three causes of white

• You chose JPEG under 'Save as': the transparency option is disabled, and the tool fills the corners and every transparent area inside the logo with the background color, with a warning.
• You unticked 'Transparent background': the tool ticks it automatically when it finds transparency in the image, but if you untick it the background color fills the corners and also the transparent areas inside the logo, and a note tells you so.
• The logo was never transparent: a PNG saved on white can look transparent in some viewers but is not. In that case the white was in the file before you rotated it.

The right way

1. Open the Image rotator and flipper tool and choose the PNG or WebP logo.
2. Type the angle or move the slider, and keep 'Expand to fit' so the logo's ends are not clipped.
3. Under 'Save as', keep 'Original format' or pick PNG or WebP.
4. Make sure 'Transparent background instead of a color' is ticked, then download.

How to check the result is transparent

The preview shows transparent areas against the page background, which can be hard to tell from white. The clearest test: place the downloaded file over a colored background in your design app or store editor. If the color shows around the logo, it is transparent; if a white rectangle appears, go back over the steps above.

Note too that a free angle recalculates the pixels, so the logo's edges get slightly softer. That is what makes a slanted edge look smooth rather than jagged, which usually suits a logo.