Format guide

ACO

Adobe Color

ACO is Photoshop's older binary color palette format (predates ASE). Two versions exist: v1 (color values only) and v2 (adds names). Most contemporary Photoshop users have moved to ASE for cross-Adobe-app compatibility, but ACO remains the format you get when Photoshop's swatch panel exports.

How to open a ACO file

Photoshop natively. Krita, GIMP (with plugin), Affinity Photo. Convert to ASE for Illustrator/InDesign use.

Primary use

Photoshop swatch panel exports.

Convert other formats to ACO

ASE → ACO (Photoshop)
GPL → ACO

Convert ACO to other formats

ACO → ASE
ACO → GPL

Looking for something else? Browse the full list of 192 converters.