How can I use Gaussian Blur to blur only part of a clip?

Question

I want to blur a name with 100% blur when it is visible on the screen. When the name is not visible, I want the blur effect to be turned off (set to 0%). If the name becomes visible again later in the same clip, I want the blur effect to return to 100%. Is this possible, and can it be done within the same clip using keyframes?

We use Premiere 2026 version

PaulMurphy · Accepted Answer

Move the playhead to the point where the name appears in the clip.In the Tools panel, click and hold the Object Mask tool, then select the Rectangle Mask tool.In the Program panel, draw the mask around the name.Add the Gaussian Blur effect to the clip.Premiere Pro automatically applies the mask to the Gaussian Blur effect.In the Effect Controls panel, click the stopwatch next to Rectangle Tool > Opacity. This lets you keyframe the mask's appearance, setting it to blurred (100%) or not blurred (0%).

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