ImageMagick
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ImageMagick is open source software for editing images, typically on the command line, often for posting to ones website.
How
See ImageMagick's Command-line Processing documentation.
Example: to create an AVIF from a PNG:
magick images/my-photo.png images/my-photo.avif
IndieWeb Examples
Joe Crawford often uses magick to convert PNGs to smaller formats.
Add yourself here⦠(see this for more details)