---
title: "Update caption word timing"
method: POST
path: "/projects/{projectId}/captions/words/retime"
tags: ["Captions and Themes"]
---

# Update caption word timing

`POST /projects/{projectId}/captions/words/retime`

## Request

- Base URL: `https://blitzreels.com/api/v1`
- URL: `https://blitzreels.com/api/v1/projects/{projectId}/captions/words/retime`
- Auth: API key in header `Authorization`

Update caption word timing.

## Path parameters

- `projectId` string, required

## Request body

- object
  - `updates` object[], required
    - `word_id` string, required
    - `start_seconds` number, required
    - `end_seconds` number, required

## Response `200`

Successful response

- object
  - `success` boolean, required
  - `updates` object[], required
    - `word_id` string, required
    - `caption_id` string, required
    - `old_start_units` number, nullable, required
    - `old_end_units` number, nullable, required
    - `new_start_units` number, required
    - `new_end_units` number, required
    - `old_start_seconds` number, nullable, required
    - `old_end_seconds` number, nullable, required
    - `new_start_seconds` number, required
    - `new_end_seconds` number, required
  - `affected_caption_ids` string[], required
  - `words` object[], required
    - `id` string, required
    - `word` string, required
    - `order_index` number, required
    - `start_units` number, nullable, required
    - `end_units` number, nullable, required
  - `message` string, required

## Other responses

- `400`: Invalid input data
- `401`: Authorization not provided
- `403`: Insufficient access
- `500`: Internal server error

---

[API](https://skmtc.dev/blitzreels/apis/blitzreels-api.md) · [All operations](https://skmtc.dev/blitzreels/apis/blitzreels-api/llms.txt) · [OpenAPI document](https://skmtc.dev/blitzreels/apis/blitzreels-api/revisions/35608b12471d?raw)