1920 × 1080 for 1080p, 3840 × 2160 for 4K, always 16:9. Check a frame and see the title-safe area. Free, no login.
1920 × 1080 (1080p) for most uploads; 3840 × 2160 (4K) if you shoot in it; 1280 × 720 is the minimum for the HD badge. Always 16:9 — the player adds bars to anything else.
The inner 90% of the frame. Players, TVs and embeds can clip the edges, so logos, captions and anything that matters stay inside it — the checker draws it on your frame.
Yes — as a Short if it's 9:16 and under 3 minutes, or as a regular video shown with bars. For Shorts, use the YouTube Shorts Size page.
No. Everything runs in your browser. Nothing is sent to Hookova.
MP4 (H.264 video, AAC audio) is the safe choice. Files up to 256 GB or 12 hours; a 1080p video at 8–12 Mbps is about 60–90 MB a minute.
YouTube Thumbnail SizeThe 1280×720 thumbnail spec — check your image, see where the duration badge lands, export it at size.
Aspect Ratio CalculatorAny ratio to pixels and back — 9:16, 16:9, 4:5, 3:4, 1:1 and custom — with the common sizes at each.
YouTube Shorts SizeThe 1080×1920 Shorts spec with the player's overlays drawn on — check a frame or download the template.
Hookova