How many pictures can be saved in one computer folder?

There is no limit per folder - it depends on the capacity of the media that the folder exists on, but its not recommended to save many pictures (thousands) in one folder, its will slow down the computer performance.

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When someone wants to access a file in the folder it is typical to get the operating system to open the folder. As the o/s list the files in the folder it will take longer to do so the more files there are.