Choose a video

Pick a video file from this computer. It is opened by your browser only — it is never uploaded anywhere.

Click to choose a video or drag and drop it here (MP4, MOV, WebM)

Loading face detection models…

Who should stay visible?

We take a few snapshots from the video and find the faces in them. Every face is blurred by default. Click the faces of the student(s) who should stay visible. Tip: pick the same student in several snapshots (different angles) for better recognition.

Snapshots

No faces found yet.

Process the video

Every part of the video is scanned for faces on this computer. Faces that match the student(s) you picked stay visible; all other faces are blurred.

Detection settings

Scan rate Detection sensitivity 0.35 Lower finds more faces (incl. blurry/turned) but may blur a few non-faces. Small / distant faces mode (≈5× slower; use for wide classroom shots)

Review & export

Automatic detection can miss faces (e.g. side profiles, very small or partly hidden faces). Watch the whole preview before sharing.

0:00 / 0:00

Show detection boxes (preview only — green = kept, red = blurred) Match strictness 0.50 Lower = stricter: a face must look more like your picks to stay visible. If the chosen student gets blurred sometimes, raise it slightly. If another child is left visible, lower it. Blur area 0.35 Blur strength 6 Number of blocks across a face; fewer = stronger. Keep blurring a lost face for 0.6 s When a face is half out of frame, turned, or covered, the detector can lose it. The blur stays on (and keeps moving the way the face was going) for this long.

Manual blur

Spot a face that isn't blurred? Pause there, turn on Draw blur box and drag over it. Each box blurs for 2 seconds from that moment; adjust the times below. If the person moves, leave the box selected, go to a later moment and drag again: the box follows them between your drawings.

Export plays the video through once in real time and records the blurred result. Keep this tab visible while exporting.