Black screen video, any length — free, no sign-up, no watermark.

Yes. Every 720p download is free, needs no account and carries no watermark, and there is no limit on how many you make or how long they run — a 10-hour black screen costs nothing. 1080p needs a sign-in and any paid plan; 4K needs Pro. Black looks the same at every size, so 720p is enough for most uses; step up only when you want the file to match a 1080p or 4K timeline pixel for pixel.

No — not on the free 720p file and not on any paid size. A mark in the corner of a black screen would make the video useless, so this tool leaves it out at every resolution.

Anything from one second to 10 hours. Tap a preset — 10 s, 30 s, 1 m, 5 m, 10 m, 30 m, 1 h, 10 h — or type your own as 90, 2:30, 45m or 1h30m. A URL can carry the length too: 10 minutes, 1 hour and 10 hours each open the tool already set. Countdowns run from 3 seconds to an hour, and an audio video is as long as the audio, up to 20 minutes.

Small. A plain colour never changes, so it is encoded at one frame a second: 10 minutes of black at 720p comes out around 100 KB, 10 hours around 5–6 MB, and a 10-second white screen at 9:16 is about 2 KB. Adding a line of text doubles the frame rate to two a second, still tiny. A countdown is real motion at 30 frames a second — a 30-second one is under 1 MB — and an audio video carries the sound track, so it is as big as the audio plus a little.

Yes — the same tool, a different swatch. White, green screen, blue, red and grey sit beside black, and a colour picker takes any hex. Green is #00B140, the flat chroma-key green that OBS, Premiere, DaVinci Resolve and CapCut key cleanly. Turn on Subtle gradient for a second colour fading top to bottom. Open it ready to go: white screen or green screen.

Switch the panel to Countdown, type the seconds — 3 to 3,600 — or tap 10 s, 30 s, 1 m, 5 m or 10 m, and pick Count down or Count up. Choose one of the eight looks from cards that are real frames of each, add a top label if you want one, and choose what shows at zero: GO!, We're live, Start or the 0 itself. Set 16:9, 9:16 or 1:1 and download. Under a minute the display counts in seconds; longer counts show MM:SS, and an hour shows H:MM:SS.

Yes — that is the Audio mode. Drop in an MP3, WAV, M4A, AAC, FLAC or OGG of up to 20 minutes and the video is exactly as long as the sound, with the audio in the MP4. Add square cover art, a title and an artist line, and a progress bar with a time readout, or keep it pure black. The file is decoded on your computer to draw the preview and mixed into the video by your browser; it is not uploaded.

Mostly as a stand-in picture: under an audio-only upload, between scenes as a cut or a fade, in front of a stream that has not started, or on a second monitor to rest the screen. Ten-hour black screens play under sleep audio and white noise and keep an OLED screen dark. Because the black here is pure #000000, it also works as a test frame for dead pixels and backlight bleed.

16:9 for YouTube and monitors, 9:16 for Shorts, Reels and TikTok, 1:1 for feeds — the same inputs laid out for each frame. A plain colour has no seam, so it loops cleanly in any player set to repeat; if you need an hour without a repeat, make the hour. A countdown does not loop — it ends on zero or your end text and holds for a second.

No. The video is encoded in the browser. Chrome and Edge encode in the background, so 10 hours is about two minutes of rendering; a browser without that support records the clip in real time, which this tool allows for clips up to 60 seconds and blocks beyond that with a note to switch browsers. Keep the tab open while it renders.

The 720p file is free to download and use in your own videos and streams. 1080p and 4K exports come with a paid plan and, like every Motion tool on LazyKiwi, are cleared for commercial use — monetised channels, client work and ads.