Kling 4.0 First to Last Frame: Animate Between Two Images

Last verified: October 29, 2026

Kling 4.0 generates the motion that carries a first frame into a last frame. It does this natively, in a single pass of up to 30 seconds, which gives a full process or a long camera move room to play out. Setting it up takes two uploads and one instruction: your opening image goes in First Frame, your closing image goes in Last Frame, and the Prompt box describes what happens between them. Then you choose Video Duration and Resolution for the render. Kling 4.0 First to Last Frame suits any shot where you already know the picture you start on and the picture you have to finish on.

The two images work as keyframes. Without keyframes, Kling 4.0 decides the order and timing of visual changes on its own. With them, you define what the picture shows at specific points in the clip, and the model works out the route between them. That trade is the reason to use this mode. When a shot has to arrive somewhere exact, like a product on its hero angle, a character in a final pose or a dish plated and ready, you keep control of where it ends and direct how it gets there in words.

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Capability Snapshot

Inputs, Settings and Output at a Glance

What you upload, what you can set and what each run returns.

Input

First Frame (JPG, JPEG, PNG or WEBP, up to 10 MB) + Last Frame (JPG, JPEG, PNG or WEBP, up to 10 MB) + a text prompt of up to 5,000 characters

Video Duration

3 to 30 seconds

Resolution

720P or 1080P

Output

1 video per run

Tips for Better Results Between a First and Last Frame

Write the Prompt as the Steps Between the Two Images

Kling's prompt format for this mode names the first frame, then the last frame, then describes the process in between. Its keyframe guidance says the same thing: set the key moments as frames, then describe the actions and transitions that connect them. First Frame and Last Frame already fix how the shot looks at each end, so use the Prompt box for sequence: what moves first, what follows, how the subject travels and what the camera does along the way. A line like 'the glass fills, ice settles, the camera pushes in to the label' gives the model a path to follow. Describing the finished glass again only repeats your Last Frame.

Give Bigger Changes More Time With Video Duration

Kling 4.0 generates long takes in one native pass, so action, scene changes and emotional build-up can unfold in full. Use that room on purpose. A single gesture or a short camera move between two similar frames needs little time. A multi-stage process, a change of location or a scene that builds emotionally needs a longer Video Duration, so each stage reads before the clip has to settle on your Last Frame. If the ending of a result feels rushed, lengthen the clip before you rewrite the prompt.

How to Make a Video From a First and Last Frame

Six steps take you from two still images to a downloaded clip.

1

Add your opening image in First Frame

Click "Upload first frame" and add the picture the clip should open on. "First Frame" is required. Choose an image framed exactly the way the shot should begin: the subject placement, lighting and angle here are where every move you describe starts.

2

Add your closing image in Last Frame

Click "Upload last frame" and add the picture the clip has to end on. "Last Frame" is required too. The further this image is from the first one, the more your prompt has to explain how the scene gets there. For a first test, pick a pair that shares the same subject and setting.

3

Describe the motion in the Prompt box

"Prompt" is required and holds up to 5,000 characters. Write what should happen between the two images; the tips above show how to structure it. If you only have a rough idea, click "Enhance Prompt" under the box to get fuller suggestions. Your text stays the same unless you pick one.

4

Choose Video Duration and Resolution

"Video Duration" runs from 3 to 30 seconds in one-second steps and starts at 5. Set it to the length of the slot the clip has to fill in your edit. "Resolution" offers 720P, the default, and 1080P. Run your first takes at 720P to check the motion, then switch to 1080P for the version you deliver.

5

Start the run with Generate

Click "Generate" once both images, the prompt and your settings are in place. Before you run, make sure the opening image is in "First Frame" and the closing one is in "Last Frame", because swapped slots play the shot in reverse.

6

Review and download the result

Play the clip all the way through before you download it, and pay most attention to the final seconds, where it settles on your closing image. If the path between the frames is wrong, change the prompt and keep the same two images, so you can see exactly what the new wording changed.

Common Problems With First and Last Frame Videos

Fixes for the issues that most often stop a run or spoil the result.

My video takes the shape of my first image and the last frame looks cropped

Kling's own parameters for keyframe generation say that once images are uploaded, the aspect ratio follows the first keyframe. A Last Frame with different proportions therefore has to be fitted to the shape of the first image. Before you upload the closing image, crop or extend it to the same proportions as the opening one and keep the important subject inside the area both share. Then run it again.

My image won't upload to First Frame or Last Frame

Both slots accept only certain image formats, up to a maximum file size and above a minimum pixel size. The exact limits are in the FAQ on image files, and a file that misses any of them is refused. Re-export the image in a supported format, compress it below the size limit, or go back to a larger original if it falls under the minimum. Then upload it again; nothing else in the form needs to change.

My prompt is too long to fit in the Prompt box

The Prompt box has a character limit, given in the prompt step of the how-to above, and long briefs often use it up on repeated instructions and stacked style adjectives. Rewrite it as one clear line per stage of the action, plus the camera move and the mood, cutting anything that says the same thing twice. Then run it again with the shorter version.

Frequently Asked Questions

Do I have to upload both a first and a last frame?

Yes. First Frame and Last Frame are both required, along with a prompt. Kling 4.0 treats a start-and-last pair as keyframes and generates the motion that connects them, so the two images together define the shot.

What makes one generation cost more than another?

The cost of a run changes with two settings, Video Duration and Resolution. Once you're signed in, the credit cost of the options you've picked is calculated and shown above the Generate button, so you can see it before you start. Enhance Prompt suggestions don't use credits.

Which image files can I use for the first and last frame?

Both First Frame and Last Frame take an image in JPG, JPEG, PNG or WEBP format, up to 10 MB per file and at least 300×300 pixels. Treat the minimum as a floor, not a target. Upload the sharpest, largest version you have of each frame, since those two pictures set the look at both ends of the clip.

How many videos does a single run produce?

One video per run. To compare two versions of the same shot, adjust the prompt or Video Duration and generate again.

References

Sources and citations used to support the content provided above.

Updated: 2026-10-29 21:17:30 4 Sources

kling.ai

Source Link
https://kling.ai/quickstart/kling-4-model-user-guide

kling.ai

Source Link
https://kling.ai/feature/kling-4-ai-video-generation

kling.ai

Source Link
https://kling.ai/blog/kling-4-ai-video-model

ir.kuaishou.com

Source Link
https://ir.kuaishou.com/news-releases/news-release-details/kling-ai-officially-launches-next-generation-kling-40-raising/