The Kling 3.0 series models API is now fully available Learn More Get Started Overview Quick Start Changelog API Reference General Info Rate Limits Callback Schema Video Generation Models Video Omni Text to Video Image to Video Reference to Video Motion Control Multi-elements to video Extend Video Lip Sync Avatar Text to Audio Video to Audio Text to Speech Voice Clone Image Recognize Element Effects Effect Templates NEW Video Effects Image Generation Models Image Omni Image Generation Reference to Image Extend Image AI Multi-Shot Virtual Try-On Others Query user info Pricing Billing Info Prepaid Resource Packs Protocols Privacy Policy of API Service Terms of API Service API Service Level Agreement Image Expansion Create Task POST /v1/images/editing/expand cURL Copy Collapse curl --request POST \ --url https://api-singapore.klingai.com/v1/images/editing/expand \ --header 'Authorization: Bearer ' \ --header 'Content-Type: application/json' \ --data '{ "up_expansion_ratio": 0.1495, "down_expansion_ratio": 0.1495, "left_expansion_ratio": 0.6547, "right_expansion_ratio": 0.6547, "prompt": "", "image": "https://p1-kling.klingai.com/kcdn/cdn-kcdn112452/kling-qa-test/dog.png", "n": 2, "external_task_id": "" }' 200 Copy Collapse { "code": 0, // Error code; Specific definitions can be found in Error code "message": "string", // Error message "request_id": "string", // Request ID, generated by the system, is used to track requests and troubleshoot problems "data": { "task_id": "string", // Task ID, generated by the system "task_info": { // Task creation parameters "external_task_id": "string" // Customer-defined task ID }, "task_status": "string", // Task status, Enum values: submitted, processing, succeed, failed "created_at": 1722769557708, // Task creation time, Unix timestamp, unit: ms "updated_at": 1722769557708 // Task update time, Unix timestamp, unit: ms } } Expand the image in any direction based on the original image. Request Header Content-Type string Required Default to application/json Data Exchange Format Authorization string Required Authentication information, refer to API authentication Request Body image string Required Reference Image Supports image input as either Base64-encoded string or URL (ensure accessibility) Important: When using Base64, do NOT add any prefix like data:image/png;base64,. Submit only the raw Base64 string. Correct Base64 format: iVBORw0KGgoAAAANSUhEUgAAAAUA... Incorrect Base64 format (with data: prefix): data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA... Supported image formats: .jpg / .jpeg / .png Image file size must not exceed 10MB. Image dimensions must be at least 300px in width and height, aspect ratio: 1:2.5 ~ 2.5:1 up_expansion_ratio float Required Expand upwards range; calculated based on multiples of the original image height Value range: [0, 2]. The total area of the new image must not exceed 3 times that of the original image Example: If original height is 20 and value is 0.1, then: The distance from the top edge of the original image to the top edge of the new image is 20 × 0.1 = 2, and the area within is the expansion range down_expansion_ratio float Required Expand downwards range; calculated based on multiples of the original image height Value range: [0, 2]. The total area of the new image must not exceed 3 times that of the original image Example: If original height is 20 and value is 0.2, then: The distance from the bottom edge of the original image to the bottom edge of the new image is 20 × 0.2 = 4, and the area within is the expansion range left_expansion_ratio float Required Expand leftwards range; calculated based on multiples of the original image width Value range: [0, 2]. The total area of the new image must not exceed 3 times that of the original image Example: If original width is 30 and value is 0.3, then: The distance from the left edge of the original image to the left edge of the new image is 30 × 0.3 = 9, and the area within is the expansion range right_expansion_ratio float Required Expand rightwards range; calculated based on multiples of the original image width Value range: [0, 2]. The total area of the new image must not exceed 3 times that of the original image Example: If original width is 30 and value is 0.4, then: The distance from the right edge of the original image to the right edge of the new image is 30 × 0.4 = 12, and the area within is the expansion range prompt string Optional Positive text prompt Cannot exceed 2500 characters n int Optional Default to 1 Number of generated images Value range: [1, 9] watermark_info object Optional Whether to generate watermarked results simultaneously Defined by the enabled parameter, format: "watermark_info": { "enabled": boolean } true: generate watermarked result, false: do not generate Custom watermarks are not currently supported callback_url string Optional The callback notification address for the result of this task. If configured, the server will actively notify when the task status changes. For specific message schema, see Callback Protocol external_task_id string Optional Customized Task ID Will not overwrite system-generated task ID, but supports querying task by this ID Must be unique within a single user account Example code import math def calculate_expansion_ratios(width, height, area_multiplier, aspect_ratio): """ Calculate top/bottom/left/right expansion ratios for image outpainting. Parameters: - width: Original image width - height: Original image height - area_multiplier: Multiplier for the outpainted area relative to original image - aspect_ratio: Width/height ratio for the outpainted area（width/height） Returns: - Formatted string with 4 decimal places, e.g."0.1495,0.1495,0.6547,0.6547" """ # Calculate target total area target_area = area_multiplier * width * height # Calculate target height and width (maintaining aspect ratio) target_height = math.sqrt(target_area / aspect_ratio) target_width = target_height * aspect_ratio # Calculate expansion pixels expand_top = (target_height - height) / 2 expand_bottom = expand_top expand_left = (target_width - width) / 2 expand_right = expand_left # Calculate relative ratios top_ratio = expand_top / height bottom_ratio = expand_bottom / height left_ratio = expand_left / width right_ratio = expand_right / width # Format to 4 decimal places return f"{top_ratio:.4f},{bottom_ratio:.4f},{left_ratio:.4f},{right_ratio:.4f}" # Example: Original 100x100, 3x area multiplier, 16:9 aspect ratio print(calculate_expansion_ratios(100, 100, 3, 16/9)) # Output: "0.1495,0.1495,0.6547,0.6547" Query Task (Single) GET /v1/images/editing/expand/{id} cURL Copy Collapse curl --request GET \ --url https://api-singapore.klingai.com/v1/images/editing/expand/{id} \ --header 'Authorization: Bearer ' 200 Copy Collapse { "code": 0, // Error code; Specific definitions can be found in Error code "message": "string", // Error message "request_id": "string", // Request ID, generated by the system, is used to track requests and troubleshoot problems "data": [ { "task_id": "string", // Task ID, generated by the system "task_status": "string", // Task status, Enum values: submitted, processing, succeed, failed "task_status_msg": "string", // Task status message, displaying the failure reason when the task fails (such as triggering the content risk control of the platform, etc.) "task_info": { // Task creation parameters "external_task_id": "string" // Customer-defined task ID }, "final_unit_deduction": "string", // Final unit deduction for the task "watermark_info": { "enabled": boolean }, "created_at": 1722769557708, // Task creation time, Unix timestamp, unit: ms "updated_at": 1722769557708, // Task update time, Unix timestamp, unit: ms "task_result": { "images": [ { "index": 0, // Image index, 0-9 "url": "string", // URL for generating images (To ensure information security, generated images/videos will be cleared after 30 days. Please make sure to save them promptly.) } ] } } ] } Request Header Content-Type string Required Default to application/json Data Exchange Format Authorization string Required Authentication information, refer to API authentication Path Parameters task_id string Required The task ID generated by images. Request path parameter, directly fill the value in the request path. external_task_id string Optional Customized Task ID for audio generation The external_task_id filled in when creating the task. You can choose to query by external_task_id or task_id When creating a task, you can choose to query by external_task_id or task_id. Query Task (List) GET /v1/images/editing/expand cURL Copy Collapse curl --request GET \ --url 'https://api-singapore.klingai.com/v1/images/editing/expand?pageNum=1&pageSize=30' \ --header 'Authorization: Bearer ' 200 Copy Collapse { "code": 0, // Error code; Specific definitions can be found in Error code "message": "string", // Error message "request_id": "string", // Request ID, generated by the system, is used to track requests and troubleshoot problems "data": [ { "task_id": "string", // Task ID, generated by the system "task_status": "string", // Task status, Enum values: submitted, processing, succeed, failed "task_status_msg": "string", // Task status message, displaying the failure reason when the task fails (such as triggering the content risk control of the platform, etc.) "task_info": { // Task creation parameters "external_task_id": "string" // Customer-defined task ID }, "final_unit_deduction": "string", // Final unit deduction for the task "watermark_info": { "enabled": boolean }, "created_at": 1722769557708, // Task creation time, Unix timestamp, unit: ms "updated_at": 1722769557708, // Task update time, Unix timestamp, unit: ms "task_result": { "images": [ { "index": 0, // Image index, 0-9 "url": "string", // URL for generating images (To ensure information security, generated images/videos will be cleared after 30 days. Please make sure to save them promptly.) "watermark_url": "string", // Watermarked image download URL, anti-hotlinking format } ] } } ] } Request Header Content-Type string Required Default to application/json Data Exchange Format Authorization string Required Authentication information, refer to API authentication Query Parameters pageNum int Optional Default to 1 Page number Value range: [1, 1000] pageSize int Optional Default to 30 Data volume per page Value range: [1, 500] Previous chapter：Reference to Image Next chapter：AI Multi-Shot Create Task Example code Query Task (Single) Query Task (List) The Kling 3.0 Series Models API is Now Fully Available – All in One, One for All！ Models Available in This Release Kling 3.0 Motion Control, Kling Video 3.0, Kling Video 3.0 Omni, Kling Image 3.0, Kling Image 3.0 Omni Refer to Key Highlights of the Models 3.0 All-in-One: A unified model for multi-modal input and output. Most powerful consistency across the universe: Subject consistency (supports cameo, subject with voice control, i2v + subject) and text consistency. Narrative control at your fingertips: More freedom, precision, and control—up to 15 seconds long, video scene cuts, ultra-high-definition storyboards/images, custom seconds. Upgraded native audio-visual output: Supports multiple speakers and languages (with accents). Kling 3.0 Motion Control Consistent Facial Identity from any angle Complex Emotions faithfully reproduced High fidelity Restoration, Even with Face Occlusions Consistent Facial Clarity Across Dynamic Framing User Guide -> Kling Video 3.0 Compared to 2.6, expected improvements: Supports subject upload in I2V scenarios for enhanced consistency Significant improvement in multi-character referencing, especially for three-person scenarios Supports Japanese, Korean, and Spanish in addition to Chinese and English Capable of generating certain dialects and accents Better distinction and control over different types of audio (speech, sound effects, BGM) Improved text retention in I2V scenarios Supports scene transitions, with up to 6 shots and customizable storyboarding User Guide -> Kling Video 3.0 Omni Compared to O1, expected improvements: Native audio-visual synchronization Supports video subject creation Further improved consistency in reference-based tasks, especially for characters and products Combined capabilities of reference + storyboarding + audio-visual sync significantly enhance usability Supports scene transitions, with up to 6 shots Extended generation duration up to 15 seconds User Guide -> Kling Image 3.0 Highly consistent feature retention Precise response to detail modifications Accurate control over style and tone Rich imaginative capabilities User Guide -> Kling Image 3.0 Omni Enhanced narrative sense New storyboard image set generation, retaining reference image features with scene relevance Direct output of 2K/4K ultra-high-definition images Further improved detail consistency User Guide -> Thank you for your support and understanding! 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