Resize video for social platforms

“Megaphone” (a social scheduling app like Buffer) needs to take one video and produce versions sized for different platforms.

Standard sizes

Platform	Dimensions	Aspect ratio
YouTube / Web	1920x1080	16:9
Instagram Feed	1080x1080	1:1
Instagram Reels / TikTok	1080x1920	9:16
Twitter / X	1280x720	16:9

API

1080p for YouTube:

ittybit video \
  -i https://megaphone-app.com/uploads/original.mov \
  --width 1920 \
  --height 1080 \
  --fit cover \
  --format mp4 \
  --cloud

const task = {
  input: "https://megaphone-app.com/uploads/original.mov",
  kind: "video",
  options: {
    width: 1920,
    height: 1080,
    fit: "cover",
    format: "mp4",
  },
};

const res = await fetch("https://api.ittybit.com/tasks", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.ITTYBIT_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify(task),
});
const data = await res.json();

import requests

task = {
    "input": "https://megaphone-app.com/uploads/original.mov",
    "kind": "video",
    "options": {
        "width": 1920,
        "height": 1080,
        "fit": "cover",
        "format": "mp4",
    },
}

res = requests.post(
    "https://api.ittybit.com/tasks",
    headers={"Authorization": f"Bearer {api_key}"},
    json=task,
)
data = res.json()

TASK='{
  "input": "https://megaphone-app.com/uploads/original.mov",
  "kind": "video",
  "options": {
    "width": 1920,
    "height": 1080,
    "fit": "cover",
    "format": "mp4"
  }
}'

curl -X POST https://api.ittybit.com/tasks \
  -H "Authorization: Bearer $ITTYBIT_API_KEY" \
  -H "Content-Type: application/json" \
  -d "$TASK"

Square for Instagram feed:

{"input": "https://...", "kind": "video", "options": {"width": 1080, "height": 1080, "fit": "cover", "format": "mp4"}}

Vertical for Reels/TikTok:

{"input": "https://...", "kind": "video", "options": {"width": 1080, "height": 1920, "fit": "cover", "format": "mp4"}}

CLI

ittybit video \
  -i original.mov \
  -o youtube.mp4 \
  --width 1920 \
  --height 1080 \
  --fit cover

ittybit video \
  -i original.mov \
  -o square.mp4 \
  --width 1080 \
  --height 1080 \
  --fit cover

ittybit video \
  -i original.mov \
  -o reels.mp4 \
  --width 1080 \
  --height 1920 \
  --fit cover

Fit modes

Fit	Behavior
`contain`	Fits inside dimensions, may letterbox
`cover`	Fills dimensions, may crop edges
`fill`	Stretches to exact dimensions

Use cover for social media — it fills the frame cleanly.