No watermark on the free export.Transparent WebM, GIF or green screen, straight out — free exports go up to 1920 px.
Your clip is deleted the moment the cutout is sent back. Want a longer video or another output format? The full tool is on the home page.
Green-screen effects used to require a physical green backdrop, even lighting and careful setup. Now the tool does the keying for you: upload a clip of yourself (filmed in your room, outside, anywhere) and VideoBGNinja returns the same clip with your background replaced by perfect chroma green. Drop it into CapCut, TikTok, Premiere, Resolve or After Effects and key it out like real green-screen footage.
✂ Green-screen my video, freeThe tool (Robust Video Matting) tracks the person through the whole clip with temporal memory, so edges stay stable while you move. You get an MP4 on chroma green (0x00B140, the exact green every editor's chroma-key filter expects), plus a transparent WebM and an alpha matte as bonuses. Original audio stays in.
Not every app supports transparent video. TikTok, CapCut mobile, Instagram edits and most phone editors don't accept alpha channels, but they all have a chroma-key / green-screen effect. A green-screen MP4 is the universal currency of background replacement.
The green-screen MP4 uses a clean, uniform chroma green (0x00B140), so keying it out is usually a one-click job: no lighting artefacts to fight. Here's where to look in the apps people actually use:
All four apps rely on the same idea as a physical green screen: replace one colour with transparency. Curious how that compares to AI matting when there's no backdrop at all? See our green screen vs AI matting comparison.
This is the part that surprises people who've done chroma key the physical way. Every problem a real green screen has comes from it being a physical object in a room:
The MP4 you get here has none of that, because the green was never in a room. It's composited digitally as one exact value — 0x00B140, flat across the whole frame, in every frame. No gradient, no crease, no shadow, no spill, because the light in your original clip never touched it. A key that needs careful tuning on real footage becomes close to trivial: sample the green, keep the tolerance narrow, done. Narrow is the counterintuitive bit — on real footage you widen tolerance to catch uneven green, and widening is what eats hair and edges. Here you never have to.
The honest trade-off: the edge came from the matting model, not from the key. Keying green can't recover a strand of hair the model already simplified. If your editor supports it, the transparent WebM or the alpha matte skips the round trip through a colour and is a shade cleaner. Green exists for compatibility — and for that it's excellent.
Four things go wrong, and each has a different cause than people assume.
A green rim around the subject. On real footage that's spill, and you'd reach for spill suppression. Here it isn't spill — it's the matte edge sitting half a pixel wide, blending subject and background. Raising the key tolerance makes it worse by eating into the edge. Instead choke or shrink the matte inward by a pixel (Ultra Key's Choke, Resolve's Matte Shrink), or switch to the alpha matte and nudge it there.
Holes in the subject. Almost always green in the shot: a green shirt, a green logo, a plant behind the shoulder that survived matting. Digital green has the same weakness as physical green — don't wear the colour you're keying. If you're stuck with the footage, key with a narrow tolerance and mask the hole by hand, or use the WebM instead so no colour is involved at all.
Soft or chewed hair. That's the matte, not the key. Better lighting on the subject at record time is the only real fix; a bit of contrast between hair and the original background gives the model something to find.
It looked fine, then looked wrong. Check the composite over a bright background as well as a dark one. A faint green or dark rim is invisible against dark grey and obvious against white, and it's far easier to fix while the project's still open.
Two habits that matter more than any setting: don't sharpen or denoise before keying — both move edge pixels around, which is exactly what the key measures — and if you'd rather not open an editor at all, ffmpeg keys it in one line:
ffmpeg -i bg.mp4 -i green.mp4 -filter_complex "[1:v]colorkey=0x00B140:0.10:0.05[fg];[0:v][fg]overlay" out.mp4Yes, no account, no watermark, no trial. The site is supported by ads and the tool runs on our own hardware.
Up to 2 GB and 90 seconds per clip, processed at up to 1920px. Trim longer videos into parts first.
No, your upload is deleted right after processing and results are wiped within 45 minutes. See the privacy policy.
Chroma green 0x00B140, the standard shade chroma-key filters are tuned for. Set your keyer to that colour and the background vanishes cleanly.
More free ninja tools: remove photo backgrounds · make a transparent video · transcribe your video