Image resize

POST https://tools.yukai.uk/api/v1/image/resize

Resize an image. Resizes to width and/or height. fit: contain (default; fits inside the box, keeps the aspect ratio, may enlarge), scale-down (like contain, never enlarges), cover (fills the box and crops; gravity=auto keeps the most interesting part), crop (like cover, never enlarges), pad (fits inside and fills the rest with background, transparent by default; white for JPEG), squeeze (stretches to the exact size). The format stays the same unless format is set (GIF becomes PNG). Typical time under 1 second. Send an image URL (GET or POST), a base64 image (POST JSON), a file upload (POST multipart/form-data, field image) or the raw image bytes (POST with Content-Type: image/*, options in the query string). The answer is the image itself by default (response=json for metadata + base64). One call = one image. The same image with the same options is answered from a 24-hour cache.

Cost

Credits: 18 ($0.0018) per successful call. Failed calls are free. Source price: ai-image-toolkit/image-processed.

Input

Send a JSON body (POST) or the same fields as a query string (GET).

No field is required.

Field	Type	Default	Description
`url`	string		Public image URL (JPEG, PNG, WebP or GIF, up to 10 MB, 50 megapixels and 12,000 px per side). Private, local and cloud-metadata addresses are refused on every redirect. Alias: `imageUrl`. For POST you can send `image` (base64) or upload the file instead.
`width`	integer		Target width in pixels. At least one of width/height.
`height`	integer		Target height in pixels.
`fit`	string	`"contain"`	How the image fits the box (see the description).
`gravity`	string	`"center"`	With fit=cover/crop: which part to keep. `auto` picks the most interesting area.
`format`	string	`"auto"`	`auto` keeps the input format (GIF becomes PNG).
`quality`	integer	`85`	Quality for JPEG, WebP and AVIF (ignored for PNG, which is lossless). Default 85.
`background`	string		With fit=pad, or for transparent areas in a JPEG: fill color (`ffffff`, `white`, `rgb(...)`).
`response`	string	`"image"`	`image` (default): the response body is the image itself (`Content-Type: image/...`, metadata in `x-*` headers). `json`: JSON with the metadata and the image as base64 in `image` (results up to 15 MB).
`image`	string		The image itself as base64 or a data URL (`data:image/png;base64,...`), up to 10 MB decoded. POST only. Aliases: `imageBase64`, `base64`.

Examples

Replace tt_live_XXXX with your key from the pricing page.

curl

curl -i -X POST "https://tools.yukai.uk/api/v1/image/resize" \
  -H "Authorization: Bearer tt_live_XXXX" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/960px-Cat03.jpg","width":400,"height":400,"fit":"cover","gravity":"auto","response":"json"}'

JavaScript (fetch)

const res = await fetch("https://tools.yukai.uk/api/v1/image/resize", {
  method: "POST",
  headers: { "Authorization": "Bearer tt_live_XXXX", "Content-Type": "application/json" },
  body: JSON.stringify({"url":"https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/960px-Cat03.jpg","width":400,"height":400,"fit":"cover","gravity":"auto","response":"json"}),
});
console.log(res.status, res.headers.get("x-credits-charged"), res.headers.get("x-credits-balance"));
console.log(await res.json());

Python (requests)

import requests

r = requests.post(
    "https://tools.yukai.uk/api/v1/image/resize",
    headers={"Authorization": "Bearer tt_live_XXXX"},
    json={"url": "https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/960px-Cat03.jpg", "width": 400, "height": 400, "fit": "cover", "gravity": "auto", "response": "json"},
    timeout=120,
)
print(r.status_code, r.headers.get("x-credits-charged"), r.headers.get("x-credits-balance"))
print(r.json())

Response

JSON with "success": true and the result fields; on failure {"success": false, "error": {"code", "message", "retryable"}} and no credits are used. Every answer carries x-credits-charged (credits used) and x-credits-balance (balance after the call); check the balance any time with GET https://tools.yukai.uk/v1/billing/balance.

Full field list and response schema: OpenAPI spec image-tools (its servers entry is the marketplace gateway; call https://tools.yukai.uk with your key).

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