aco

.aco — Adobe Color Swatch

Adobe · 1990s

Developer

Adobe

Key Features

Stores custom color palettes.
Supports individual colors, gradients, and patterns.
Facilitates color consistency across projects.
Shareable between compatible graphic design applications.

Best For

Organizing and reusing frequently used colors.
Ensuring brand color consistency.
Quickly applying complex gradients as swatches.
Sharing color schemes within the Adobe ecosystem.

Less Ideal For

Storing actual image data.
Complex vector artwork.
Font definitions.
Interactive web elements.

Common Use Cases

Saving brand color guidelines.
Creating themed color sets for specific art styles.
Sharing color schemes with collaborators.
Maintaining color accuracy in web and print design.

How to Open It

In Adobe Photoshop, go to Window > Swatches and click the library icon to load the .aco file.
Many other graphics editors like Affinity Designer or GIMP can import .aco files via their swatch management panels.
Some online tools and standalone applications might also offer .aco import functionality.

What is a .aco file?

The .aco file format is used by Adobe Photoshop to store color palettes. These palettes can contain individual colors, gradients, or patterns, allowing designers to easily save, share, and apply consistent color schemes across different projects. While primarily associated with Photoshop, these swatches can often be imported into other graphics software. They are essentially a way to organize and recall specific color information for creative workflows.

Programs That Open .aco Files

Platform	Program
Windows	Adobe Photoshop	Paid	Official
	GIMP	Free
	Affinity Designer	Paid
macOS	Adobe Photoshop	Paid	Official
	GIMP	Free
	Affinity Designer	Paid
Linux	GIMP	Free

How to Convert .aco Files

Format	Method
.ASE	Adobe Photoshop, GIMP (with plugin)
.TXT	Hex editors (manual extraction)

Common Problems with .aco Files

⚠️ Cannot open .aco file in a non-Adobe program.

Ensure the program supports .aco import or use Adobe Photoshop or GIMP to convert it to a more compatible format like .ase.

⚠️ Color values appear different after import.

Check color profiles and settings in both the exporting and importing applications, as discrepancies can occur.

Frequently Asked Questions

What is the difference between .aco and .ase files?▼

.aco is an older Adobe Photoshop-specific swatch format, while .ase (Adobe Swatch Exchange) is a more universal format that can store more types of color information and is supported by a wider range of applications.

Can .aco files store gradients?▼

Yes, newer versions of the .aco format can store gradient presets, in addition to solid colors.

Are .aco files vector or raster?▼

.aco files do not contain image data; they store color definitions, which are vector-like in nature but are not graphic elements themselves.

Technical Details

ACO files are binary files containing definitions for colors, gradients, and patterns. Each color entry typically includes RGB, CMYK, or Grayscale values along with a name. Older versions of the format might store different color modes or lack support for certain gradient types.

Did You Know?

The .aco format predates the widespread adoption of the .ase format for color exchange.

While primarily for colors, some .aco files can contain gradient definitions and pattern presets.

Security Information

As .aco files are primarily data containers for color information, they generally pose minimal security risks. However, as with any file downloaded from an untrusted source, exercise caution and ensure your graphics software is up-to-date to prevent potential exploits.