ACDSee relies on a system of internal plug-ins (usually .apl files) to decode various image formats. Because WebP gained mainstream popularity after versions like ACDSee Pro 8, 9, or early Ultimate editions were released, these legacy programs lack the native code required to read the format.
Without a plugin, attempting to open a WebP file in an older version of ACDSee results in: "Decode Error" messages.
For power users:
Some legacy implementations may show a black background instead of transparent in WebP files. 4. Alternatives to Using a Plugin
Check that .webp is included in the list of "Recognized File Types." Benefits of Using WebP in Your Workflow acdsee webp plugin
Restart your computer to refresh system-level file associations.
Edit WebP files using ACDSee’s advanced adjustment layers. Open ACDSee and navigate to Tools > Options . Click on File Associations . ACDSee relies on a system of internal plug-ins (usually
This usually happens if there is a conflict between the Google Codec and a 3rd-party codec pack (like K-Lite). Try uninstalling other codec packs if issues persist.
Double-click a WebP file. With the plugin active, the ACDSee Viewer launches instantly. You can zoom in to 100% to inspect fine details, pan around, and use the slideshow feature—exactly as you would with a JPEG. For power users: Some legacy implementations may show
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