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Pyxel Edit was originally a free program, and the free version is still available. However continued development to make it a more solid and full featured application has taken a lot of the developers time so the next big update will be paid. Initially there will be a discounted beta version available to support continued development. Buyers of the beta will get the normal priced later versions without further cost.
Tile references with transformations
Draw in one tile and they all update instantly. Tile instances can be rotated and flipped, still referencing the same tile data.
Make animations easily and export them as sprite sheets or animated GIFs. Onion skinning helps with aligning things between frames.
Pyxel Edit can import images of tilesets or mockups and identify all the unique tiles automatically, allowing you to edit and rearrange old tilesets or doing edits of mockups easily.
Export your canvas tilemap in XML, JSON or plain text format for super quick game prototyping. You can also repeat the last export operation with a keypress, to quickly re-export for small changes.
Designed to feel familiar to other graphics applications, Pyxel Edit is really easy to learn.