Glossary
Punch-In Zoom
Punch-in zoom is a video reframing technique that magnifies a specific region of a horizontal clip to fill a portrait (9:16) canvas, keeping the primary subject — typically a face or action zone — large and readable on mobile screens.
Punch-in zoom, crop zoom, punch-in effect, speaker zoom, auto-punch, and digital punch-in are all terms for the same reframing operation. The differences are contextual: 'punch-in zoom' and 'punch-in effect' originate in broadcast editing, where operators zoomed into a camera feed without physically moving the camera. 'Crop zoom' comes from editing software menus. 'Speaker zoom' is the dynamic variant that tracks a speaker's face across the frame. 'Auto-punch' describes the automated version of the technique, where the zoom applies without manual clipper input.
For clippers converting landscape YouTube or Twitch footage to portrait for TikTok, Shorts, and Reels, punch-in zoom solves the small-face problem. A streamer's face in a wide 16:9 frame occupies roughly 12–15% of a portrait canvas without any zoom. A 1.8–2.5x digital punch-in brings that to 30–50% of the frame — the range where mobile-native audiences register the subject as prominent rather than distant.
Static punch-in zoom locks to a fixed crop region for the duration of a clip. Speaker zoom (the dynamic variant) tracks the subject across the frame using face-detection. AutoClip applies speaker zoom by default, using face-tracking to keep the primary subject centered through natural movement, and falls back to center crop for clips without a detectable face.
Related Terms
Frequently Asked Questions
Are punch-in zoom, crop zoom, and speaker zoom the same thing?
They describe the same underlying operation — magnifying part of the horizontal frame to fill a portrait canvas — but with different nuances. Crop zoom is the general term. Punch-in zoom emphasizes the aggressive, decisive nature of the crop. Speaker zoom is the dynamic variant that tracks a face across the frame rather than locking to a static crop region.
Does AutoClip apply punch-in zoom automatically?
Yes. AutoClip's reframing pipeline applies speaker zoom (face-tracked punch-in) automatically after clip approval. For clips without a detectable face, it defaults to a center crop. Clippers can override the crop position for any source channel, and the override persists for all future clips from that channel.
Put Punch-In Zoom to Work
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