What file formats support transparent background?

Related questions

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2. How do I make a JPEG background transparent?
3. What is flatten transparency?
4. How do I remove the white background from a PDF?
5. How do you flatten transparency in PDF?
6. What does flatten a PDF mean?
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Tags

1. #support
2. #transparency
3. #either
4. #include
5. #color
6. #raster
7. #channel
8. #formats
9. #transparent
10. #alpha
11. #through