---
title: "Create a layout update on a template-conversion"
method: POST
path: "/api/v1/template-converter/update-layout"
tags: ["Template Converter"]
---

# Create a layout update on a template-conversion

`POST /api/v1/template-converter/update-layout`

Updates the layout of one or more slides and re-renders the
affected portion of the converted deck. Returns a new
`callback_id` to poll. All parameters are supplied in the request
body.

## Request body

- TemplateConverterUpdateLayoutRequest — Request body for `POST /api/v1/template-converter/update-layout`.
  - `callbackId` string, required — Conversion job id. Must correspond to a live conversion session.
  - `slideIndex` integer[], required — Zero-based indices of the slides to update. Must be an array with at least one element, even for a single slide.
  - `layoutId` string, required — Target layout id, taken from `GET /api/v1/template-converter/layouts`.
  - `source` 'targetTemplateLayouts' | 'inputDeckLayouts', required — Which layout collection `layoutId` belongs to.

## Response `200`

Pipeline accepted; poll the returned `callback_id`.

- TemplateConverterAsyncProcessingResponse — Response for endpoints that kick off a derived conversion pipeline (update-layout, modify-format, template-change, review-suggestions PATCH). These endpoints do **not** use the canonical `success`/`data` envelope — the fields below are returned at the top level. Poll the returned `callbackId` via `GET /api/v1/template-converter/status/{callbackId}`.
  - `status` 'processing', required — Always "processing" — the derived pipeline has been accepted and is running.
  - `callbackId` string, required — Callback id of the newly started pipeline. Note the camelCase spelling.
  - `presentationName` string — Resolved presentation name. Returned by template-change and the review-suggestions PATCH; may be an empty string.

## Other responses

- `400` — Generic client error. `error.code` is one of `BAD_REQUEST`, `INVALID_JSON`, `MISSING_REQUIRED_FIELD`, `MISSING_QUERY_PARAM`, `MISSING_CALLBACK_ID`, `MISSING_SLIDES_ARRAY`, `MISSING_PROMPT`, `MISSING_TEMPLATE_ID`, `MISSING_FILE_CONTENT`, `MISSING_SHARE_DETAILS`, `INVALID_TYPE`, `INVALID_DATA`, `INVALID_DATA_TYPE`, `INVALID_PAYLOAD`, `INVALID_REQUEST`, `API_REQUEST_FAILED`, or `FILE_UPLOAD_FAILED`.
- `401` — Caller did not present a valid Bearer token, or the token has expired. `error.code` is one of `UNAUTHORIZED`, `INVALID_API_KEY`, `EXPIRED_API_KEY`.
- `403` — Caller is authenticated but not allowed to perform this operation. `error.code` is `FORBIDDEN`.
- `404` — Requested endpoint or resource does not exist. `error.code` is one of `ENDPOINT_NOT_FOUND`, `RESOURCE_NOT_FOUND`, `NOT_FOUND`.
- `422` — Request was well-formed but failed semantic validation. `error.code` is one of `INVALID_INPUT`, `UNPROCESSABLE_ENTITY`.
- `429` — Rate limit, usage limit, or gateway-level throttle exceeded. `error.code` is `TOO_MANY_REQUESTS` (gateway throttle), `RATE_LIMIT_EXCEEDED` (per-category), or `USAGE_LIMIT_EXCEEDED` (annual quota). Default limits (all configurable per company/key): - Gateway throttle (per API key) → `TOO_MANY_REQUESTS`: 10 requests/second sustained, 5 burst, 1,000 requests/day. - Per-company, per-category sliding 60-second window → `RATE_LIMIT_EXCEEDED`. The applicable category is given by each operation's `x-rate-limit-category`. - Annual usage quota → `USAGE_LIMIT_EXCEEDED`: 50,000 slide generations/year and 1,000,000 presentation downloads/year. `X-RateLimit-Limit`/`X-RateLimit-Remaining`/`X-RateLimit-Reset` are returned on successful (2xx) responses from rate-limited endpoints and, with `Retry-After`, on the per-category `RATE_LIMIT_EXCEEDED` 429 (the headers declared below). The gateway `TOO_MANY_REQUESTS` and annual `USAGE_LIMIT_EXCEEDED` responses do not carry them. Read `X-RateLimit-Remaining` to self-throttle and honour `Retry-After` on a 429.
- `500` — Unexpected server error. `error.code` is `INTERNAL_SERVER_ERROR`.
- `503` — Service is temporarily unavailable (downstream dependency unhealthy). `error.code` is `SERVICE_UNAVAILABLE` or `EXTERNAL_SERVICE_ERROR`.
- `504` — A downstream call timed out. `error.code` is `GATEWAY_TIMEOUT`.

---

[API](https://skmtc.net/prezent/apis/prezent-platform-api.md) · [All operations](https://skmtc.net/prezent/apis/prezent-platform-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/prezent/prezent-platform-api/revisions/a01cb764a085/schema)