REACTIONPRESS

Green screen
in CapCut.

You have a PNG with a green background and you want it on a TikTok. Three steps, one eyedropper, and one fix for the green edge everybody hits.

The short version

  1. Add it as an overlay, not as the main clip — overlays are what the key applies to.
  2. Turn on the chroma key tool on that overlay and eyedropper the green.
  3. Raise intensity until the background goes, then back off two notches so the edges stay intact.

If you came here with no image yet, a generated plate keys more cleanly than a filmed one because there is exactly one shade of green and no shadow on the background.

CapCut on a phone

  1. New project → import your footage first, so there is something underneath.
  2. Overlay → Add overlay → choose your PNG.
  3. With the overlay selected, open Cutout → Chroma key.
  4. Tap the eyedropper and touch the greenest part of the background — the corner, not the edge.
  5. Slide Intensity up until the green vanishes. If the subject starts losing thin parts, come back down.
  6. Slide Shadow (or spill) up a little to kill the green fringe on the edges.

Menu names move between versions. If there is no Chroma key under Cutout, look under Adjust — it is the same control.

CapCut on a desktop

  1. Drop the footage on track 1, the PNG on track 2.
  2. Select the PNG clip, then open Video → Chroma key in the right panel.
  3. Tick it on, use the eyedropper on the green, and adjust Intensity and Shadow.
  4. Scale the character with the on-canvas handles — hold shift to keep the aspect ratio.

The three things that go wrong

1. A green line around the character

Spill. Raise the key's shadow/spill slider a little, or add one or two points of feather. A plate with a single flat green has far less spill than footage, so this is usually small.

2. The character goes see-through

Intensity is too high, or the subject contains the same green. Pull intensity back and key a corner rather than the middle of the background.

3. The character looks soft at the edges

The image was scaled up too far. A 1024 × 1024 plate is fine up to full screen on a 1080 × 1920 timeline; beyond that, drop it to a corner reaction instead of full bleed.

Then post it

Export at 1080 × 1920, 30 or 60 fps. TikTok re-encodes everything, so a clean flat key survives the compression far better than a fine hair or a smoke effect will.

a hamster doing light work, no reaction a cat that just knocked a glass off the table more reaction image ideas

Questions

How do I remove a green screen in CapCut?

Add the PNG as an overlay, select it, turn on the chroma key control, eyedropper the green, then raise intensity until the background goes and lower it until the edges stop eating into the subject.

Why is there still a green edge?

Spill — green light bouncing onto the edges. Use the key's shadow/spill slider, or a point of feather. It is much smaller on a generated plate than on filmed footage.

Does the PNG need a transparent background?

No. A flat green background keys out more reliably than real alpha, because alpha gets flattened whenever a file is resized, re-saved or compressed.

What size should the image be?

At least 1000 px on the long edge. Reaction Press files are 1024 × 1024 — enough for full screen on a 1080 × 1920 timeline.

Can I monetise a video that uses one?

Yes. The holder of a piece may use the image in their own work, including paid work.

Where do I get one?

Reaction Press generates one from a single line of text, for US$1.99, numbered out of 10,000.

Where to look next