Ugoira

Ugoira (うごイラ) is a unique animated illustration format created by and exclusive to Pixiv.

It's essentially a short, looping animation made from a series of still images (frames) that artists upload. Think of it as something between a GIF and a short video clip – but it's Pixiv's own proprietary format.

Key characteristics:

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• Short loops (usually 1-10 seconds)
• Created by uploading multiple frames with timing data
• Higher quality than typical GIFs
• Popular for animation practice, character movements, and adding life to illustrations
• Can only be viewed on Pixiv (or downloaded and converted to other formats)

Artists use ugoira to show simple animations like:

• Character breathing or blinking
• Hair/clothing moving in wind
• Subtle expressions changing
• Loop animations of scenes

It's particularly popular in the Japanese art community for adding motion to manga-style artwork and doujinshi characters without needing full animation software or video editing skills.