Smart Crop 16:9 to 9:16 Coordinates Helper

What this helper produces

The Smart Crop 16:9 to 9:16 Coordinates Helper converts landscape footage into consistent vertical crops for Shorts, Reels, and TikTok. You enter your source resolution and a simple, timestamped list of anchor boxes that mark the subject or action. For each timestamp, the tool uses the full source height and computes a matching 9:16 width as height×0.5625. It then centers the window horizontally on the anchor midpoint and clamps the position inside the 16:9 frame so you avoid black bars or missing edges.

How to write clean anchors

Use one line per moment in time with HH:MM:SS or HH:MM:SS.mmm followed by x, y, w, h numbers. Example: 00:00:05, x=850, y=220, w=180, h=220. Spaces are flexible; the parser safely ignores malformed rows and sorts everything by time. Add more anchors when attention shifts, the speaker changes, or the subject crosses the frame. Shorter gaps between anchors reduce visible jumps. If you need a margin around faces or UI, set a small horizontal padding percent so the window leaves breathing room without breaking 9:16.

Keeping motion smooth

For quick action, interpolation helps. Switch Interpolate to Linear and the tool inserts gentle midpoints so x slides between anchors instead of stepping. This keeps the subject centered while avoiding the wobble that often appears with hand-set crops. You can still fine-tune motion curves in your editor; the coordinates here focus on clean, repeatable framing that translates well to different pipelines.

Quality, framing, and platform safety

Typical source sizes are 1920×1080, 2560×1440, and 3840×2160. Greater height yields a wider 9:16 window and more detail on phones. Keep frame rate and shutter consistent to avoid judder. In gameplay or UI capture, confirm health bars, minimaps, and subtitles stay inside the crop. Interviews benefit from anchors on the active speaker; switch anchors when the speaker changes to keep attention centered. Social apps overlay captions and controls near the edges, so avoid placing critical text at the extreme top or bottom of the frame.

Exports for real workflows

The table presents timestamped coordinates you can scan quickly. The copy block is handy for notes, tickets, or chat handoffs. JSON suits scripts and automation, CSV fits spreadsheets and timeline utilities, TXT is convenient for quick sharing, and YAML works well for config-driven pipelines. The FFmpeg snippet helps scaffold filter graphs or per-clip commands. Keep one timestamp per line and your outputs will be predictable across most editors.

Keywords and practical uses

People look for vertical crop, shorts reframing, reels crop coordinates, smart crop 9:16, and ffmpeg crop filter. This helper targets those exact jobs with a mobile-first layout that keeps text in straight lines and results aligned. Because the tool runs entirely in your browser, no media is uploaded. Paste anchors, press Calculate, copy the coordinates, and you are ready to build crisp vertical edits with minimal trial and error.

Which line format should I use?

Use HH:MM:SS or HH:MM:SS.mmm followed by x, y, w, h. One timestamp per line keeps results predictable.

Why use full source height?

It preserves detail and guarantees the computed 9:16 width fits inside a 16:9 frame, avoiding letterbox artifacts.

How do I reduce jumpy movement?

Add anchors more frequently during fast action or enable Linear interpolation to insert a gentle midpoint.

What export format should I pick?

Use JSON or YAML for scripts, CSV for spreadsheets, TXT for quick notes, and the FFmpeg snippet for filter graphs.