Free tool // Frame lines
How many pixels inside the frame line?
Pick the camera, the recording format and the frame line. You see how many pixels are left inside, how much of the sensor it uses and whether it holds a UHD or HD master without scaling. Every aspect ratio at once, for quick answers on set.
En español ↗Inside the frame line ·
…
- Desqueezed image
- Megapixels
- Of the recorded area
- Sensor area
- Master without scaling
Every frame line in this format
| Frame line | Pixels | Desqueezed | MP | Of area | Sensor area | Master without scaling |
|---|
Pixels rounded to even numbers, centred in the format. "Master without scaling" compares with a UHD (3840 × 2160) or HD (1920 × 1080) master of the same aspect ratio, upright for vertical aspect ratios.
Quick answers
How is the resolution inside a frame line calculated?
It finds the largest rectangle of that aspect ratio that fits in the format you record. If the frame line is wider than the format, it uses the full width and crops the height; if it is narrower, it uses the full height and crops the width. With an anamorphic lens the maths runs on the desqueezed image. Pixels are rounded to even numbers, like camera frame line tools do.
How much resolution is left for a 9:16 vertical?
From 4.6K 3:2 Open Gate on an ALEXA 35 (4608 × 3164), a 9:16 frame line leaves 1780 × 3164: enough for an HD vertical master (1080 × 1920) without scaling, not for a UHD one (2160 × 3840). From UHD 16:9 (3840 × 2160) you get 1216 × 2160. If the vertical matters as much as the horizontal, shoot open gate or a taller format.
And a 16:9 inside open gate?
On the same ALEXA 35 in 4.6K 3:2 Open Gate, 16:9 leaves 4608 × 2592, more than UHD. The rest of the sensor sits above and below for reframing or for the vertical.
Where do the formats come from?
Resolutions and sensor areas from each camera maker's format tables, the same data behind the camera specs pages. Checked 2026-11-08.
Made by Adrian Alescio, DIT in Barcelona. Free tools, no sign-up, built for the set.