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ACEO stands for Art Cards, Editions and Originals. It's a miniature artwork format measuring exactly 2.5" × 3.5" — the same dimensions as a standard trading card or playing card. ACEOs can be paintings, drawings, digital art, collage, photography, or mixed media — any medium fits, as long as it's made to that size.
The format grew out of the trading card collecting world in the early 2000s, when artists began making original miniature pieces sized to fit in standard card sleeves and binders. That's still the appeal: an ACEO is small enough to collect, store, and trade like a card, but it's an original work of art (or a limited, numbered edition), not a print of something else.
You'll also see the same 2.5"x3.5" format called an ATC (Artist Trading Card). The two terms are used almost interchangeably today, though they started from slightly different traditions — ATCs were originally made to be traded hand-to-hand between artists rather than sold. Read the full breakdown in ACEO vs ATC: What's the Difference?
ACEOs make original art accessible. Instead of spending hundreds or thousands of dollars on a full-size painting, you can own a real, original piece from an artist you admire for a few dollars to a few hundred, depending on the artist. They're easy to display, easy to ship, and easy to start collecting with no real barrier to entry.