Kling Video 4.0 Flash Text-to-Video.

Kling Video 4.0 Flash Text-to-Video Overview

Kling Video 4.0 Flash Text-to-Video creates a new video from a written description without requiring an image or source clip. This model is part of the Kling Video 4.0 Flash family. Its four-field interface starts with text alone, with no image upload or source clip required. Select duration and framing directly, including cinematic 21:9, landscape, portrait or square output.

Write a nonempty prompt, choose a duration, select an aspect ratio and submit the generation. The prompt is the only required input. Output durations run from 3 to 20 seconds at 720p. Use the model for short creative clips, concept development and application workflows where the intended action fits a single short scene. Each request pairs creative instructions with the supported input settings. Review the result for the details that matter to your project before selecting it as a finished asset.

Capabilities

• Generate a new video from a required text prompt without uploading source media.
• Choose an integer duration from 3 through 20 seconds; default 10 seconds.
• Generate 720p video through the exposed resolution setting.
• Select 21:9, 16:9, 9:16 or 1:1 framing for different placements.
• Describe subject action, camera movement, atmosphere and unwanted details in one prompt.
• Integrate text-to-video requests with four documented input fields.

Use Cases for Kling Video 4.0 Flash Text-to-Video

Creators can prepare short scene concepts before a shoot. A prompt such as "A lone hiker reaches a misty ridge as the camera rises behind them" provides a concrete action and a visual destination without requiring location footage.

Marketers can explore ad backgrounds or product-story settings. For example, "A sunlit kitchen counter with drifting steam and a slow sideways camera move" describes a reusable scene; review the result before adding final brand graphics.

Developers can build text-to-video features around the required prompt and optional duration, resolution and aspect_ratio fields. Designers can compare landscape and portrait versions of one concept, keeping the written action stable while changing the framing parameter.

Kling Video 4.0 Flash Text-to-Video also fits early creative reviews where an editable idea matters more than reproducing a particular uploaded subject.

Tips and Tricks

Start with the main subject and one clear action, then add the setting, lighting and camera movement. Plan the action to fit the requested duration rather than compressing a long story into one short clip.

For a product concept, try: "A ceramic cup rests on a wooden table beside a rain-streaked window. Steam rises as the camera slowly pushes forward. Warm morning light, single continuous shot." For a travel scene: "A cyclist crosses a quiet coastal road at sunrise. Wide landscape framing, steady tracking camera, soft sea mist."

Set duration and aspect_ratio in the input fields, not only in your prose. Keep negative instructions in the same prompt because this model exposes no separate negative_prompt field. Change one creative variable at a time when comparing results.

Technical Specifications

• Output: generated video; a successful task provides a video URL.
• Duration: integer seconds from 3 through 20; default 10 seconds.
• Resolution: 720p only; default 720p.
• Required input: prompt, a nonempty string.
• Aspect ratios: 21:9, 16:9, 9:16 and 1:1; default 16:9.
• Prompt limits: 1–26,000 characters for English-only text or up to 11,000 for non-English-only text. Mixed-language input must satisfy E/26000 + N/11000 ≤ 1; Kling enforces the weighted limit.
• Processing: asynchronous. No fixed completion time, output codec or configurable output frame rate is specified by the current integration.

Things to Be Aware Of

A detailed prompt is still an instruction, not a frame-by-frame contract. Dense sequences, competing camera directions or many simultaneous actions can make the intended scene harder to communicate. Check the generated motion and composition before using a clip in a finished piece. Setting a portrait description in prose does not replace selecting 9:16 in aspect_ratio.

Respect the language-weighted prompt limit and send only documented fields. Describe unwanted details in the same prompt instead of adding a negative_prompt parameter. Keep the first request simple enough to review before preparing a larger set of variations.

Key Considerations

No source media is needed. Make the subject, action, lighting and camera direction clear in the prompt. Select framing in aspect_ratio; the default is 16:9. Plan one action that fits the selected duration, then keep output parameters stable when comparing revised prompts.

Billing is calculated per task from the reported charge, rather than a published flat price per clip. No fixed per-second estimate is present in this model’s current catalog. Review the final billed cost before budgeting a large batch.

Limitations

This endpoint accepts text, not image, source-video, Element or voice references. Output is limited to 720p and integer durations from 3 through 20 seconds. There is no seed, output frame-rate or separate negative-prompt control. Exact timing, readable typography and repeatable visual identity are not guaranteed. A request cannot supply extra input fields beyond the four documented parameters. Check important details before publication.