Any image file is OK. Please upload two files.
Twitter official client (PC, mobile browser) show image file on white background on timeline. But if you click or tap the picture, bigger image is shown on black background. So it can be seen differently if the image has transparent part.
This site will create a transparent PNG file which will be seen as the first file on white background and as the second file on black background.
What you need to do is only to upload two different image file. Please try it!
Supported formats are jpg, png and gif.
The result image can be seen if someone access direct URL but the file will be deleted soon. So please don't share the URL on SNS or blogs. If necessary, please save the image file.
We this site use the uploded files only for creating the result image file. We don't use them for other purpose.
Any rights of the uploaded image file belongs to the one who has the rights of the original file. We this site doesn't have any rights of it.
The result image after conversion is free to use. It means that we this site doesn't set any limitation for usage. But don't use API of this site to offer other services.
You cannot upload file if too many people are using this system at once.
Specifications of this site are subject to change without notice.
Please be careful about the rights of the original file if the files you uploaded are not your own files.