How Many Undo Steps Are in Paint.NET History?

This article provides an overview of the undo and redo limits within the Paint.NET History window, detailing the exact number of actions the software retains by default and how your computer's storage affects that capacity.

By default, Paint.NET retains an unlimited number of undo and redo steps in the History window. Unlike many other photo editing tools that limit history states to a fixed default number (such as 20 or 50), Paint.NET does not impose an artificial numerical restriction on how far back you can revert your changes.

The only real limitation on the number of undo and redo steps is your computer's available disk space. Each action performed on an image generates a complete or partial snapshot that is saved as a temporary file on your primary drive (specifically in your system's temporary directory). As long as your hard drive has sufficient free storage space to write these scratch files, Paint.NET will continue to log every change you make during an active editing session.

Because complex actions on large, high-resolution canvases with multiple layers generate large history files, working on extensive projects can rapidly consume several gigabytes of drive space. If your drive runs out of space, Paint.NET will fail to commit new history states or report an out-of-memory/disk-space error.

Once you close an image or exit Paint.NET, all stored undo and redo states are permanently discarded, and the temporary scratch files are purged from the drive. Consequently, the history list cannot be saved with the image file or recovered in a future session.