主要フォーマット

Instagram Storyサイズ：1080×1920を推測不要

Stories are full-bleed 9:16. Put type at the top or a logo at the bottom and Instagram covers it. Learn the safe zone and frame in seconds.

The real canvas (and what UI hides)

1080×1920 is the file. On phones, clock, bottom bar, and stickers eat margin. Design as if the top and bottom 15% are “Instagram rent.”

If text only reads on desktop, it fails on mobile.

Stretching a 4:5 post into a story (warped faces).

Desktop screenshots with black side bars “so it fits.”

CTAs glued to the bottom edge where reply buttons live.

Upload → Instagram (or ?platform=instagram) → Story → fill or fit → pan/zoom → download JPG. Local processing only.

Exact Instagram Story size?

1080×1920 (9:16).

Same file for Reels?

Same 9:16 canvas, but Reel covers also appear in a grid—keep the subject readable at stamp size.