What is a .ACO file?
ACO is a Photoshop colour-swatch palette. Created and opened by Adobe Photoshop.
- Did you know
- An ACO file lets artists share a chosen set of colours between Photoshop projects.
- An ACO swatch can store colours in RGB, CMYK, HSB, Lab or grayscale, with each channel kept as a 16-bit big-endian value.
- The format has two versions, the second adding a name to every swatch while keeping the first version’s data for compatibility.
- What Analyser reads
- Identify Adobe project files and read their metadata: Photoshop (PSD, PSB), Illustrator (AI), InDesign (INDD), After Effects (AEP, AEPX, AET) with composition / layer / effect and asset extraction, Premiere Pro and Elements (PRPROJ, PREL) with sequence and media counts, XD, Animate (FLA), and Lightroom.
- Depth of analysis
- .ACO is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .ACO file
- Drag a .ACO file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.