4K Black Screen Video at 3840×2160, Free, Silent, and Sized Honestly
A native UHD black clip for 4K monitors, TVs, OLED observation, and sequences that master at 3840×2160. No audio track, no logo, no fade at either end. One thing worth knowing before you pick a duration: the 4K files are dramatically larger than their Full HD equivalents, and the reason is not the pixel count. It is how often the encoder writes a keyframe.
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Why a 4K Black File Runs 122 Times the Full HD One
Four times the pixels ought to mean roughly four times the bytes, and it does not. The 1-minute 4K MP4 is 1,503,684 bytes against 18,558 for 1080p, eighty-one times larger, and from five minutes on the ratio settles near 122 times. Keyframe cadence explains all of it. The UHD encode writes a full keyframe every second and a black keyframe at 4K measures 24,973 bytes, so sixty of them come to 1,498,380 bytes, which is 99.6 percent of that one-minute file. The Full HD encode writes one keyframe per 250 frames, roughly one every fifty seconds, and spends the rest of its running time on repeated frames costing about a dozen bytes each. The 5-second clip is the exception: at 26,268 bytes it is barely more than a single keyframe, only about three times the 5-second Full HD file rather than a hundred.
The WebM Shortcut, Worth 86 Percent at Every Duration
When the size is the obstacle, the VP9 encode removes it outright. At 4K the WebM is a flat 14 percent of the MP4 at every duration from ten seconds up: 210,488 bytes instead of 1,503,684 at one minute, 2,101,559 instead of 15,029,116 at ten minutes, and 12,607,560 instead of 90,170,408 across a full hour. That ratio does not drift the way it does at 480p or 720p, so you can budget storage from it directly. The trade is reach: WebM plays in browsers and most modern desktop players but is awkward inside some editing suites and signage systems, which is where the bulkier MP4 earns its size.
UHD Display and Signal-Chain Testing
A native 4K black frame is the least demanding thing a UHD chain will ever carry, which makes it the right first test rather than the last. If black plays clean but real footage stutters, the fault sits in bandwidth or decode rather than in the link itself. If black alone shows banding, a color cast, or a raised floor instead of true darkness, look at the panel, the HDMI mode, or how the player handles color. Run the same file fullscreen on a monitor, on a TV, and through a separate media player in turn and you have narrowed the chain before touching anything complicated.
OLED Dark-State Observation
A pure black frame drives OLED pixels to off, making it a controlled reference for dark-state behavior: whether a status overlay stays lit, whether near-black regions differ across the panel, whether the set applies its own brightness handling once the scene goes dark. This is observation and not repair. A black video will not undo image retention and nothing on this page suggests it can. For an unattended session the 30-minute UHD MP4 at 43 MB or the same duration in WebM at 6 MB both work, and the WebM is the sensible pick when the screen runs off a small stick.
UHD Editing Plates and Export Checks
Teams delivering UHD reach for black plates constantly: slates, gaps between segments, a held tail under outro audio, and export checks where rendering a short black section reveals whether the bitrate ladder, container, and color tags survive the pipeline. Because the MP4 and the MOV carry an identical H.264 stream, differing by exactly 53 bytes of container header, a mixed Apple and Windows team can be handed either one with no re-encode. Import the 10-second version at 251,318 bytes to confirm project settings before pulling a 30-minute plate.
Câu hỏi thường gặp
Why is the 4K black screen file so much larger than the 1080p one?
Keyframes, not pixels. The UHD encode writes one keyframe every second at 24,973 bytes apiece while the Full HD encode writes one every fifty seconds, and that alone accounts for more than 99 percent of a one-minute 4K file. If size matters more to you than container reach, the 4K WebM is 14 percent of the MP4 at the same duration.
Do I actually need 4K, or will the Full HD file do?
If your timeline, your display, or your delivery target is UHD, take the 4K file, because an upscaled plate can soften the edge of a dissolve where it meets real footage. For anything else the 1080p version is a fraction of the size and looks identical, since both are the same black. A 4K screen plays the Full HD file happily, it simply will not be native.
Will an older player stutter on the 4K file?
Black is the easiest content a decoder will ever be handed, so playback rarely stutters even on hardware that struggles with real UHD footage. The more common failure is outright refusal: a player with no VP9 support declining the WebM, or an older device whose decoder tops out below 3840×2160. A shorter MP4 or the 1080p version will play there.
How big is each 4K duration?
As MP4: 26,268 bytes at 5 seconds, 251,318 at 10 seconds, 752,258 at 30 seconds, 1,503,684 at 1 minute, 7,514,988 at 5 minutes, 15,029,116 at 10 minutes, 45,085,632 at 30 minutes, and 90,170,408 bytes, about 86 MB, across an hour. The WebM of any duration is 14 percent of those figures and the MOV is 53 bytes less than the MP4.
Is the 4K file free to use in client or commercial work?
Yes. Every UHD file here is royalty-free for personal and commercial use: client deliveries, monetized video, paid presentations. No attribution is asked for and there is nothing on this site to buy. Full wording sits on the Terms of Service page.