Extend Duration

Increase an overlay's duration by a delta. Pushes neighbors on the same row.

How It Works

delta_frames is how many frames to ADD. At 30fps, 1 second = 30 frames.

Specifications

Category
Editor Core
Execution
instant
Credit Cost
Free
Overlay Types
video, sound, image, text, caption, sticker, template, shape +5 more
Tags
timing, duration

Example Prompts

“make this longer”
“extend by 2 seconds”
“add 3 seconds to this clip”

Required Parameters

overlay_id (number)
undefined
delta_frames (number)
Number of frames to add to current duration

Optional Parameters

user_text (string)
undefined

Use Cases for Editor Core

Speed up or slow down footage for dramatic effect in vlogs and documentaries
Split and rearrange clips to create montage sequences
Trim dead air and pauses from interview recordings

How to Get Started with Extend Duration

1.Open any project in the 6trim editor or create a new one.
2.Type a prompt in the AI assistant — for example: "make this longer".
3.The Extend Duration result appears as a video overlay on your timeline. Drag to reposition or resize.

Frequently Asked Questions

Try Extend Duration Free

Type a prompt or use the toolbar. No download required.

Use Extend Duration

More Editor Core Tools

Change Speed
Change the playback speed of an overlay.
Slow Motion
Apply slow motion effect to an overlay.
Batch Speed Change
Apply a speed change to multiple overlays at once.
Move Overlay
Move an overlay to a new start position on the timeline without changing its duration. Pushes neighbors on the same row.
Shorten Duration
Shorten an overlay by removing a number of seconds/frames from the end. Use this when user says 'make shorter', 'reduce duration', 'shorten by X seconds'. Do NOT use trim_to_playhead for this — trim_to_playhead is only for cutting at the playhead position.