How to Judge Face Blur Strength—and When to Use a Solid Mask

If you can still recognize a person through the blur, the effect is not doing what you need for that audience. There is no useful universal answer such as “use a radius of 20”: editors calculate effects differently, and a face filling the frame is a different problem from a tiny face in a crowd.

In Unseen, you choose an anonymization method. The current interface does not offer a numeric blur-strength or mask-size slider. Advice that tells you to drag one is advice for a different editor.

Here is how to judge the result you actually have.

First decide whether the problem is strength or coverage

Pause on an unsatisfactory frame.

If a blur is centered on the face but recognizable details remain visible through it, consider a different effect. If the eyes or part of the face are outside the affected area, the problem is coverage. If the face is completely untouched for a few frames, the problem is detection or tracking.

A stronger blur cannot fix a frame where no blur was applied. That distinction saves you from repeatedly changing the wrong thing.

For coverage problems, review why face blur misses frames. Drawing the missing box in Review & fix faces, a tighter crop, or removal of the shot may be needed.

Compare effects on the hardest shot

Choose a close-up or head turn, not the easiest distant face. Export a short example and compare Blur with Pixelate or Black bar where available.

Ask:

• Can I still recognize the person from facial features?
• Does the effect cover the relevant area throughout the movement?
• Does the mask briefly vanish when a hand crosses the face?
• Is a second appearance visible in a mirror or screen?
• Is the resulting shot still useful for the purpose of the video?

A solid effect can hide the pixels it covers more plainly than a soft blur, but it still depends on coverage. A narrow bar across the eyes is not the same as removing an entire face.

Inspect at a useful size

Do not judge privacy from a small upload preview alone. Open the exported file at its delivered resolution. Watch it at normal speed and pause at entrances, exits, turns, and obstructions.

If you will publish a tighter crop, review that crop too. Enlarging the person can make features easier to notice even though the underlying effect has not changed.

Compression is not a dependable extra layer of anonymity. Use the file you intend to publish for the decision.

Change the shot when the effect is not enough

Sometimes the best solution is editorial: show hands performing the task, use a wide shot without the person, or cut the identifying moment.

A barely blurred face may suit an aesthetic intention, but it is a poor basis for a serious privacy promise. Choose an effect and framing that meet the actual need, then check voice, clothing, and context separately. No facial setting resolves those clues.