kling-v2-1

Kling 2.1 image-to-video Legacy API.

Image to video

Create task

POST /kling/v1/videos/image2video

cURL

curl --request POST \
  --url https://www.anyfast.ai/kling/v1/videos/image2video \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "model_name": "kling-2.1",
    "image": "https://example.com/start.png",
    "image_tail": "https://example.com/end.png",
    "prompt": "The subject turns and smiles",
    "negative_prompt": "blurry, distorted",
    "duration": "5",
    "mode": "pro",
    "watermark_info": {"enabled": false}
  }'

200

{"id":"860260753860210752","task_id":"860260753860210752","object":"video","model":"kling-v2-1","status":"queued","progress":0,"created_at":1773130665}

Request body

model_name · string · required

Must be kling-2.1.

image · string · required

Start-frame URL or raw Base64.

image_tail · string

Optional end frame. Start-and-end-frame generation requires 1080p pro mode.

prompt · string

Positive prompt, up to 2,500 characters.

negative_prompt · string

Negative prompt, up to 2,500 characters.

mode · string · default: "std"

std for 720p or pro for 1080p.

duration · string · default: "5"

5 or 10 seconds.

watermark_info · object

Set enabled to request an additional watermarked result.

Image requirements

Use a public URL or raw Base64 without a data URI prefix. JPG, JPEG, and PNG are supported. Files must be no larger than 10 MB, both sides at least 300 px, and the aspect ratio between 1:2.5 and 2.5:1.

Query task by ID

GET /kling/v1/videos/image2video/{task_id}

Request headers

Authorization · string · required

Bearer authentication in the form Bearer YOUR_API_KEY.

Content-Type · string · default: "application/json" · required

Data exchange format. Use application/json.

Path parameters

task_id · string · required

The task ID returned by the create endpoint.

cURL

curl --request GET \
  --url https://www.anyfast.ai/kling/v1/videos/image2video/TASK_ID \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json'

data.task_status is submitted, processing, succeed, or failed. When the task succeeds, data.task_result.videos[] contains the temporary result url and actual duration.

Response fields

code · integer

0 indicates that the query was accepted.

message · string

Error information; empty for a successful query.

data.task_id · string

Queried task ID.

data.task_status · string

submitted, processing, succeed, or failed.

data.task_status_msg · string

Failure details when the task fails.

data.task_result.videos · object[]

Generated videos, returned after success.

data.task_result.videos[].url · string

Temporary generated-video URL.

data.task_result.videos[].duration · string

Actual duration in seconds.

data.created_at · integer

Creation Unix timestamp in milliseconds.

data.updated_at · integer

Last update Unix timestamp in milliseconds.

200

{
  "code": 0,
  "message": "",
  "data": {
    "task_id": "asyntask_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "task_status": "succeed",
    "task_result": {"videos": [{"url": "https://example.com/result.mp4", "duration": "5"}]},
    "created_at": 1784720890000,
    "updated_at": 1784720949000
  }
}

Generated result URLs are removed after 30 days. Save the files promptly.

Kling 2.1 does not provide text-to-video. It also does not support audio, specified voices, multi-shot, motion brush, camera control, or cfg_scale.