---
title: "Transform an image"
method: POST
path: "/v1/content/transform"
tags: ["Content"]
---

# Transform an image

`POST /v1/content/transform`

Deterministic image transform routed by the `operation` discriminator: `optimize` rehosts a palette PNG (resize ≤1200px), `resize` produces exact dimensions via the vision-guided fal pipeline (Sharp cover-crop fallback). Returns the CDN-hosted `url` + dimensions. Credit-metered (fixed cost: optimize 1, resize 2).

## Headers

- `Idempotency-Key` string

## Request body

- union
  - object
    - `operation` 'optimize', required
    - `imageUrl` string, uri, required
  - object
    - `operation` 'resize', required
    - `imageUrl` string, uri, required
    - `width` integer, required
    - `height` integer, required
    - `prompt` string
    - `resolution` '1K' | '2K' | '4K'
    - `outputFormat` 'png' | 'jpeg' | 'webp'

## Response `200`

The operation result.

- ContentTransformResponse
  - `url` string, uri, required
  - `width` integer, required
  - `height` integer, required
  - `aspectRatio` string
  - `bytes` integer
  - `fallbackUsed` boolean

## Other responses

- `400` — The request body or query string was invalid (unknown key, wrong type, or missing required field). Strict schemas reject unknown keys — including `brandId`, which is always resolved from the API key.
- `401` — The API key was missing, invalid, or revoked.
- `402` — The org's remaining credit balance is below what this operation requires. Credit cost is published PER-OPERATION (see `GET /v1/help`): content/media operations charge a flat cost, while AI generation (email generate/edit/import, image generation) is usage-metered — charged by actual model usage rather than a flat price. `details.cost` carries the amount the runtime required for THIS call. Check your balance up front via `GET /v1/usage`. No `Retry-After` — credits reset at the billing-period boundary.
- `403` — The caller does not have the required `emails` permission.
- `409` — The same `Idempotency-Key` was reused with a different request body.
- `422` — The source image/video could not be processed (unreachable URL, non-decodable media, or upload failure).
- `429` — The request hit the rolling rate limit window.
- `500` — Unexpected internal error.
- `503` — The credit balance could not be verified (a transient billing dependency outage). The gate fails closed rather than do paid work it cannot meter. Retryable — `Retry-After` indicates when.

---

[API](https://skmtc.net/brew/apis/brew-public-api-v1.md) · [All operations](https://skmtc.net/brew/apis/brew-public-api-v1/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/brew/brew-public-api-v1/versions/db96cfedc6c5/schema)