Convert ACO to PNG

People need this conversion when a website, document system, or non-Adobe application accepts PNG but not an Adobe swatch file. Because ACO stores color definitions rather than pixels, the result is a newly rendered swatch sheet, not a direct image-format rewrite.

What the ACO format is

ACO is Adobe Photoshop’s Color Swatch format. It stores color values and, in supported versions, color names and color-space information; designers use it for brand palettes, design handoffs, and Photoshop projects. An ACO file has no canvas, pixel grid, or predefined visual arrangement, so creating a PNG requires placing its colors on a new canvas.

What the PNG format is

PNG is a lossless raster format supported by browsers, operating systems, design software, and document tools. It preserves sharp swatch edges, supports transparency, and does not introduce JPEG-style compression artifacts. The PNG preserves only the rendered colors, labels, background, and layout. It does not retain editable ACO metadata such as swatch names, grouping, or the original color-space representation.

How to create a PNG swatch sheet

Using Adobe Photoshop

1. Open the Swatches panel with Window → Swatches.
2. Open the panel menu and choose Import Swatches, Load Swatches, or the equivalent command in your Photoshop version. Select the .aco file.
3. Create an RGB document with File → New. Choose a suitable canvas size, an sRGB profile for typical web use, and a white or transparent background.
4. For each imported swatch, select it in the Swatches panel and draw a rectangle with the Shape or Marquee tool followed by a fill. Add names with the Type tool if the ACO contains names that must appear in the image.
5. Save the result with File → Export → Export As, choose PNG, and enable transparency only when the background should remain transparent.

Use an 8-bit-per-channel RGB PNG for an ordinary palette preview. A larger canvas can improve readability, but extra resolution cannot add color data that was not present in the ACO file.

Using GIMP

1. Open the Palettes dock through Windows → Dockable Dialogs → Palettes.
2. Use the dock’s import or load command to select the .aco file. Support for particular ACO variants depends on the GIMP version.
3. Create an RGB image, construct a grid of filled rectangles from the imported colors, and add labels if required.
4. Export the image with File → Export As and use the .png extension.

Photoshop is the better choice for Adobe-specific color names and non-RGB entries. If GIMP does not recognize the file, use Photoshop or first obtain the palette in a format GIMP supports, such as ASE, when available.

Using a browser-based tool

Photopea can be used as a browser-based alternative when its current Swatches panel provides an Load or Import .ACO command: load the palette, create an RGB document, paint and label the swatches, then use File → Export As → PNG. Verify the command in the current version before relying on it, and do not upload confidential brand palettes or proprietary project data.

Most general-purpose online converters do not accept ACO, and services that do may produce an undocumented preview rather than a faithful palette sheet. For private files or exact Adobe compatibility, local Photoshop or GIMP is preferable.

Quality and compatibility limits

The conversion is a rendering operation. The PNG contains only what is placed on the canvas and cannot be reloaded as an editable Photoshop swatch library.

RGB swatches usually render predictably, but CMYK, Lab, grayscale, and other non-RGB values must be converted to the document’s RGB profile. The displayed result can therefore differ from the original values, especially with out-of-gamut colors or spot-color definitions. Keep the original .aco file with the PNG when exact values, names, or future editing matter.