Kling 3.0 API

Introduction

Kling 3.0 Image to video takes an opening frame (image_url) and a prompt describing what happens after it, and returns 3 to 15 seconds at 720p, 1080p or 4K. Set last_image_url to pin a closing frame as well, so the clip has to arrive somewhere specific rather than just start somewhere. Turn generate_audio on for dialogue and ambience generated with the picture.

Choose a Kling 3.0 mode by starting material

Key features

An opening frame and, if you set it, a closing one

The clip starts on your image exactly as it is. Add last_image_url and Kling works toward that frame instead of an open ending - in our test of a fog-bound pier walk, the last frame of the clip matched the closing image almost exactly, red scarf and all.

The frame decides the look, the prompt decides the motion

Describe only the action, the camera and the sound - not the wardrobe or the setting, which the opening frame already fixes. Our forecourt-lightning example never redescribes the woman or the gas station from its frame; it only adds the lightning strike, her walk into the rain and the thunder.

Aspect ratio follows the frame

There is no separate aspect_ratio field here: the output takes the shape of your opening image, from a wide landscape to a tall portrait crop.

Request parameters

Pricing

Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.

Each task is rounded up to whole credits, so one run at the lowest tier costs 51 credits for a 5-second clip ($0.51).

For an exact number before you run, send the same body to POST /jobs/quote.

Use cases

Continue a character exactly as designed

When a person has to look the same from one clip to the next, generate or choose a still first, then animate it here instead of writing a fresh text-to-video prompt that would leave wardrobe and face to chance again.

Land a clip on a specific ending

Set a closing frame when the last beat of the shot matters - a held expression, a hand on a door, a figure walking into focus - rather than leaving the ending to the model.

Test a product or fashion still in motion

A still photo of a product or an outfit, with a prompt for a simple camera move, is enough to see how a static image reads once it moves and, with audio on, sounds.

Prompt guide & pro tips

Describe only what the frame does not already show

Our forecourt-lightning example keeps to what happens after the still: the flash, her step off the truck, the walk into the downpour. It never repeats her outfit or the setting, both of which the image already fixed.

Lock the shot when continuity matters

Across 15 seconds a detail in the background can drift. If a specific object or layout has to stay put, name it directly ("the same red truck stays parked behind her the whole time") rather than assuming the opening frame pins it for the full clip.

Say "one continuous shot, no cuts" for a single unbroken take

Our yacht-rail example cut to a second angle and shifted from dusk to daylight on a first attempt; adding that line to the front of the prompt, along with a description of the light staying the same, held both the framing and the color through the whole clip on the retest.

API quick start

Call the Kling 3.0 API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
2. Send the request. POST /jobs/createTask with model kling/3.0/image-to-video and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "kling/3.0/image-to-video",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "resolution": "720p",
    "duration_seconds": 5,
    "shot_type": "single"
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

Kling 3.0 API questions

All Kling models

Kling O3 is the more flexible sibling: up to seven reference photos in one shot, automatic multi-shot cuts, and editing of clips you already have. Kling 3.0 is the pick for a single polished shot with first and last frames or Motion Control.

• Kling 3.0 API4K clips, multi-shot cuts and motion controlFrom 51 credits for a 5-second clip
• Kling O3 APIKling’s unified model: create, animate, reference and edit up to 4KFrom 51 credits for a 5-second clip
• Kling 3.0 Turbo APIFaster Kling 3.0 with sound on every clipFrom 84 credits for a 5-second clip
• Kling Avatar 2.0 APIA portrait that speaks or sings your audio, up to 5 minutesFrom 7.68 credits per second
• Kling 2.6 API1080p clips with optional sound and motion controlFrom 52 credits for a 5-second clip
• Kling 2.5 Turbo API1080p clips with a soundtrack on every takeFrom 42 credits for a 5-second clip
• Kling 2.1 Master APISilent 1080p clips with fine prompt controlFrom 162 credits for a 5-second clip
• Kling 2.1 APIAnimate a frame at 720p or 1080p, with an optional end frameFrom 27 credits for a 5-second clip

Other video APIs

• MiniMax H3 APIExpressive clips with audio, up to 2KFrom 28 credits for a 5-second clip
• Seedance 2.5 APIByteDance's newest: 30-second clips with native audioFrom 56 credits for a 5-second clip
• Vidu Q4 Preview APIUp to 4K clips with sound and spoken dialogueFrom 34 credits for a 5-second clip
• Wan 3.0 APIUp to 30-second clips with synced audioFrom 34 credits for a 5-second clip
• MiniMax H3 Max APIFast clips with ambience, effects and musicFrom 38 credits for a 5-second clip
• LTX 2.5 APILong 20-second takes up to 4K with a soundtrackFrom 68 credits for a 5-second clip

More about Kling 3.0

Try it

Kling 3.0 AI Video Generator onlineCreate videos with Kling 3.0 in PopNow

Compare

Kling 3.0 vs Seedance 2.5Kling 3.0 vs Wan 3.0Kling 3.0 vs Kling O3Kling 3.0 vs MiniMax H3

Docs

Kling 3.0 model ID and input schema in the API docsPopNow API quickstart: your first request in five minutesImage to video guide for the PopNow APIWebhooks: get Kling 3.0 results without polling