> ## Documentation Index > Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt > Use this file to discover all available pages before exploring further. # Kling 4.0 Video Edit > The Kling 4.0 Video Edit API edits a 3–30 second source video from a text instruction, with optional reference images and subjects, at 720p or 1080p. > [!TIP] > > 1. After submission, a `task_id` will be returned. If you provided a `callback_url`, when the task status becomes `finished` or `failed`, a POST request will be sent to the `callback_url`. > 2. Regardless of whether `callback_url` is provided, you can retrieve the result through the unified [Query Task Status](https://docs.vidgo.ai/api-manual/task-management/status.md) endpoint. Kling 4.0 Video Edit changes an existing 3–30 second video from a text instruction: restyle the scene, swap objects or backgrounds, or adjust the action, while keeping the source motion. Reference images and image-based subjects can show exactly what to insert. Kling 4.0 is Kuaishou's Kling AI video model. Vidgo exposes it as four model IDs: [Text to Video](https://docs.vidgo.ai/api-manual/video-series/kwaivgi-kling-v4-0-text-to-video.md), [Image to Video](https://docs.vidgo.ai/api-manual/video-series/kwaivgi-kling-v4-0-image-to-video.md), [Reference to Video](https://docs.vidgo.ai/api-manual/video-series/kwaivgi-kling-v4-0-reference-to-video.md) and [Video Edit](https://docs.vidgo.ai/api-manual/video-series/kwaivgi-kling-v4-0-video-edit.md). ## Models * **kwaivgi/kling-v4.0/video-edit** — Video edit with Kling 4.0: text-guided editing of a 3–30 second source video, 720p or 1080p. ## Features * Text-guided video edit of a 3–30 second source clip. * Optional reference images (`@Image1`, …) and image-based elements (`@Element1`, …). * Output length matches the source by default, or set `duration`. * 720p or 1080p output. ## Required parameters * `video_url` (string): Public HTTP(S) URL of the source video, 3–30 seconds, up to 100 MB. * `prompt` (string): The edit instruction, 1–26,000 characters after trimming. ## Optional parameters * `duration` (integer): Output length, `3`–`30` seconds. No default: if omitted, the output matches the source. * `resolution` (string): `720p` or `1080p`. Default `720p`. * `reference_image_urls` (string\[]): Up to 10 public HTTP(S) image URLs. * `kling_elements` (object\[]): Up to 7 image-based elements, each `{element_input_urls}` with 2–4 image URLs. Video elements are not supported here. ## Output The finished task returns one MP4 video, with an audio track, in the `files` array of [Query Task Status](https://docs.vidgo.ai/api-manual/task-management/status.md) and the callback payload. ## Examples * **Restyle, keep source length**: a winter makeover of a street clip without `duration`, so the output follows the source. * **Replace an object with a reference image, with callback**: swap a phone for the product in `@Image1`, 10 seconds at 1080p, with a `callback_url`. ## Notes * `multi_prompt`, `image_urls`, `reference_video_urls`, `aspect_ratio` and video-based elements are not supported on this ID and return 400. * The source video is downloaded and measured server-side; it must run 3–30 seconds and be at most 100 MB. * Fields not listed above return 400. `model` and `callback_url` belong at the request root, not inside `input`. * Credits are reserved at submission and depend on `resolution` and duration. When an input video is present, a separate input-video rate applies to billed seconds = output duration + the larger of the output duration and the total input video length (summed, then rounded up to whole seconds). A failed task is refunded in full. See the [pricing page](https://vidgo.ai/apis/api-pricing) for current rates. Without `duration`, the output duration is billed as the source length rounded up. * Output is 720p or 1080p only; there is no 4K or HDR tier, no audio on/off switch and no `seed` on this model. ## OpenAPI ````yaml api-manual/video-series/kwaivgi-kling-v4-0-video-edit.json POST /api/generate/submit openapi: 3.0.0 info: title: Vidgo API - Kling 4.0 Video Edit description: >- The Kling 4.0 Video Edit API edits a 3–30 second source video from a text instruction, with optional reference images and subjects, at 720p or 1080p. version: 1.0.0 servers: - url: https://api.vidgo.ai description: Production server security: - BearerAuth: [] paths: /api/generate/submit: post: tags: - Video Series summary: Kling 4.0 Video Edit description: >- Send `video_url` and `prompt`. `multi_prompt`, `image_urls`, `reference_video_urls` and `aspect_ratio` are not supported and return 400. Input videos are downloaded and measured server-side (up to 100 MB each). Each must run 3–30 seconds, and all input videos together must not exceed 30 seconds. operationId: submit_kwaivgi_kling_v4_0_video_edit requestBody: required: true content: application/json: schema: type: object required: - model - input properties: model: type: string description: Model ID. Use `kwaivgi/kling-v4.0/video-edit`. example: kwaivgi/kling-v4.0/video-edit callback_url: type: string format: uri nullable: true description: >- Optional public HTTP(S) endpoint that receives a POST when the task becomes `finished` or `failed`. HTTPS is recommended. Omit it, or send `null` or an empty string, to disable callbacks. example: https://your-domain.com/callback input: type: object required: - video_url - prompt properties: video_url: type: string format: uri example: https://example.com/source.mp4 description: >- Public HTTP(S) URL of the source video, 3–30 seconds, up to 100 MB. prompt: type: string minLength: 1 maxLength: 26000 example: >- Turn the street into a snowy winter evening and keep the people and camera motion unchanged description: >- Edit instruction, 1–26,000 characters after trimming. Describe what to change in the source video. `multi_prompt` is not supported on this ID. duration: type: integer minimum: 3 maximum: 30 description: >- Output length in seconds (integer, 3–30). Omit it to match the source video; billing then uses the source length rounded up. resolution: type: string enum: - 720p - 1080p default: 720p description: Output resolution. It sets the billing rate. reference_image_urls: type: array items: type: string format: uri maxItems: 10 description: >- Up to 10 public HTTP(S) reference image URLs, cited in the prompt as `@Image1`, `@Image2`, …. kling_elements: type: array items: type: object required: - element_input_urls properties: element_input_urls: type: array items: type: string format: uri minItems: 2 maxItems: 4 description: >- 2–4 public HTTP(S) image URLs showing the same subject. additionalProperties: false description: One image-based element. maxItems: 7 description: >- Up to 7 image-based subjects (elements). Each element has `element_input_urls` with 2–4 images. Video elements are not supported on this ID. Refer to them in the prompt as `@Element1`, `@Element2`, … in array order. additionalProperties: false description: Generation parameters. examples: restyle: summary: Restyle, keep source length value: model: kwaivgi/kling-v4.0/video-edit input: video_url: https://example.com/street.mp4 prompt: >- Turn the street into a snowy winter evening and keep the people and camera motion unchanged resolution: 720p replace_product: summary: Replace an object with a reference image, with callback value: model: kwaivgi/kling-v4.0/video-edit callback_url: https://your-domain.com/callback input: video_url: https://example.com/unboxing.mp4 prompt: >- Replace the phone in the hands with the speaker from @Image1, keep lighting and hand motion reference_image_urls: - https://example.com/speaker.png duration: 10 resolution: 1080p responses: '200': description: Task submitted content: application/json: schema: type: object required: - code - data properties: code: type: integer enum: - 200 description: HTTP status code. data: type: object required: - task_id - status - created_time properties: task_id: type: string description: >- Task ID. Use it with [Query Task Status](/api-manual/task-management/status). status: type: string enum: - not_started description: Initial task status. created_time: type: string format: date-time description: Time the task was created (ISO 8601). example: code: 200 data: task_id: task-unified-1762160000-abc123 status: not_started created_time: '2026-11-03T10:30:00' '400': description: >- Invalid input, unsupported field, inaccessible media, or insufficient credits content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '401': description: Invalid credentials content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '403': description: Access denied content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '404': description: Unknown or disabled model content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '408': description: Request timed out content: text/plain: schema: type: string example: Request timeout '422': description: Invalid JSON or non-object request body content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '429': description: Rate or API key credit limit exceeded content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '500': description: Internal error content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '502': description: Unable to create the upstream generation task content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. '503': description: The requested model is temporarily unavailable content: application/json: schema: type: object required: - detail properties: detail: oneOf: - type: string - type: object additionalProperties: true - type: array items: {} description: Error message. components: securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: API Key description: >- All API endpoints require Bearer Token authentication Get your API Key: Go to **Dashboard → API Key** ([API Key Management Page](https://vidgo.ai/apis/dashboard/api-key)) to get your API Key Add it to the request header: ``` Authorization: Bearer VIDGO_API_KEY ``` ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.