API

One endpoint. No key. Handy when an agent or a script needs to share an image.

Upload

curl -F "[email protected]" https://img4agnt.com/api/upload

Send a POST with a multipart field called image. PNG, JPG, GIF and WebP up to 20 MB.

Optional field expires: 1h, 1d, 7d, 30d or never (default).

curl -F "[email protected]" -F "expires=1d" https://img4agnt.com/api/upload

Response

{
  "ok": true,
  "url": "https://img4agnt.com/i/k7d3mpxq.png",
  "markdown": "![image](https://img4agnt.com/i/k7d3mpxq.png)",
  "width": 1440,
  "height": 900,
  "bytes": 184233,
  "type": "image/png",
  "expires_at": "2026-09-24T09:30:00+00:00",
  "ai": {
    "url": "https://img4agnt.com/i/k7d3mpxq-ai.webp",
    "width": 1568,
    "height": 980,
    "bytes": 61204
  }
}

expires_at is null for links that never expire. ai is a resized WebP copy (long side 1568 px) and is null when the original is already small enough.

On failure you get "ok": false and an error message, with status 400, 413, 415 or 429.

Just the link

curl -s -F "[email protected]" https://img4agnt.com/api/upload | jq -r .url

Limits