--- title: "Upscale an image with Nano Banana Pro, by asset id or by uploaded bytes" method: POST path: "/v2/image/upscale/nano-banana-pro" tags: ["images-upscale"] --- # Upscale an image with Nano Banana Pro, by asset id or by uploaded bytes `POST /v2/image/upscale/nano-banana-pro` Regenerate the source image at a higher resolution tier (1K, 2K, or 4K) while preserving its content, composition, and style. Supply the source either as an `image_asset_identifier` reference (an image already stored with Ideogram) or as raw `image` bytes (multipart requests only) — callers are never required to upload the asset first. If both are supplied, the reference wins and the bytes are ignored. Uploaded bytes are used for this request only and are not stored as an asset; upscales of a referenced asset keep a visible link to their source image. An optional `prompt` adds short guidance for the enhancement; the image is otherwise upscaled as-is. The source must be smaller than the requested `resolution_tier`. By default the request blocks until the upscaled image is ready and returns it in `data`. Set `async` to true to return immediately after the request is accepted, then poll for completion and results with `GET /v1/generations/{generation_id}` using the returned `generation_id`. Supplying a `webhook_url` makes the request asynchronous whatever `async` says: the response returns as soon as the request is accepted, and the finished result is POSTed to that URL. ## Query parameters - `dry_run` boolean ## Request body - UpscaleImageNanoBananaProRequest — Supply the source image either as an `image_asset_identifier` reference or (multipart requests only) as raw `image` bytes. Exactly one source is required; if both forms are given, the reference is used and the bytes are ignored. - `image_asset_identifier` AssetIdentifier — An identifier for an ideogram asset. - `asset_type` 'ASSET' | 'CANVAS_ASSET' | 'LAYERED_ASSET' | 'RESPONSE' | 'UPLOAD', required - `asset_id` string, required - `image` string, binary — The source image to upscale (max size 50MB), as raw bytes; only common image formats such as JPEG, PNG, and WEBP are supported. Multipart requests only; ignored if `image_asset_identifier` is also supplied. The bytes are used for this request only and are not stored as an asset. - `prompt` string — Optional short guidance for the enhancement, appended to the model's upscaling instruction. When omitted, the image is upscaled as-is. - `resolution_tier` '1K' | '2K' | '4K' — The output resolution tier. The model sizes its output by tier at the source image's aspect ratio; exact pixel dimensions cannot be requested. Rejected when the source is already at or above the requested tier. Defaults to "2K". - `seed` integer — Random seed. Set for reproducible generation. - `async` boolean — When false (the default), the request blocks until the upscaled image is ready and returns it in `data`. When true, the request returns as soon as it is accepted; poll for completion and results with `GET /v1/generations/{generation_id}` using the returned `generation_id`. - `webhook_url` string, uri — HTTPS URL that Ideogram delivers the generated result to. Ideogram sends a JSON POST to this URL once all images for the request have finished generating. The body mirrors the synchronous generate response: `request_id`, `created`, and a `data` array containing every generated image (`url`, `prompt`, `resolution`, `seed`, `is_image_safe`). Each delivery is signed with Ed25519 and verifiable against the public keys at `https://api.ideogram.ai/v1/.well-known/jwks.json`. Must be HTTPS; private and loopback hosts and the cloud metadata service are rejected. - `private` boolean, nullable — When true or omitted, the output is kept private to your account. Set to false to publish the output to the public feed. Enterprise accounts always generate privately. - `target_collection_id` string — A collection you can write to, by its URL-safe base64 collection id. The output images are added to it when the request completes. ## Response `200` The upscaled image (synchronous requests), or an acknowledgement to poll with `GET /v1/generations/{generation_id}` (`async` requests). - UpscaleImageNanoBananaProResponse — Response returned by `POST /v2/image/upscale/nano-banana-pro`. Synchronous requests (the default) include the upscaled image in `data`. Requests with `async` set to true omit `data`; poll for completion and results with `GET /v1/generations/{generation_id}` using the returned `generation_id`. The seed reports the value the request resolved to when the caller left it unset; width and height report the output dimensions. - `generation_id` string, required — URL-safe base64 ID of the accepted generation. Accepted by the `GET /v1/generations/{generation_id}` polling endpoint. - `data` UpscaleImageObject[] — The upscaled image. Present only for synchronous requests (`async` omitted or false). - `url` string, uri, nullable — The direct link to the upscaled image. Empty when the image did not pass safety checks. - `resolution` string, required — The resolution of the upscaled image, formatted as "WIDTHxHEIGHT". - `is_image_safe` boolean, required — Whether the image passed safety checks. If false, `url` is empty. - `seed` integer, required — Random seed. Set for reproducible generation. - `seed` integer, required — Random seed. Set for reproducible generation. - `width` integer, required — The output width in pixels. - `height` integer, required — The output height in pixels. ## Other responses - `400` — Invalid input provided. - `401` — Unauthorized. - `402` — Insufficient credits or quota. - `404` — The referenced source asset was not found. - `422` — The prompt did not pass safety checks. - `429` — Too many requests. - `500` — Internal server error. - `503` — The endpoint is temporarily unavailable. ## Changes - **2026-09-19** `4e95197be44a` — 1 info - endpoint added [Change history](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/changes/v2/image/upscale/nano-banana-pro/post.md) --- [API](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0.md) · [All operations](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/llms.txt) · [OpenAPI document](https://skmtc.dev/ideogram/apis/ideogram-openapi-3-0/revisions/52c1c6497d87?raw)