Facebook video and Reels sizes, 2026

Quick reference

Placement	Aspect ratio	Recommended size
Reels	9:16	1080×1920
Feed video (vertical)	4:5	1080×1350
Feed video (square)	1:1	1080×1080
Feed / Watch (landscape)	16:9	1920×1080
Stories	9:16	1080×1920

Upload MP4 or MOV with H.264 video and AAC audio for the most predictable processing. These are the formats third-party guides and Meta’s ad specs consistently recommend; Meta’s organic Reels help page is rendered dynamically and changes, so check it if you need the current maximum length or file size.

What Facebook actually delivers (our measurements)

We inspected public videos on NASA’s Facebook Page in October 2026 (public-domain content) and recorded what Facebook serves:

Video	Ready-made file	Top stream	Audio
40 s clip, uploaded 2026	H.264 1280×720, ~945 kbps	AV1 1920×1080, ~1.3 Mbps	HE-AAC ~74 kbps
60 s clip, 2026	H.264 (HD)	AV1 up to 1440p	AAC
3 min video, 2021	H.264 (HD)	VP9 1080p, ~3.7 Mbps	AAC ~49 kbps
2 h 27 min live replay	H.264 (HD)	H.264 1080p, ~1.5 Mbps	AAC ~65 kbps

Three takeaways for creators:

• Upload at least 1080p. Facebook only serves resolutions up to what you uploaded, and its top stream is the only one above 720p.
• Facebook re-encodes everything, to AV1 or VP9 for new uploads and H.264 for others, at fairly low bitrates. Sharp, well-lit footage with little noise survives best.
• Audio is stored at modest bitrates (roughly 50–130 kbps AAC). Mix voice clearly; don’t rely on subtle detail.

Reels safe zones

Keep text and logos out of roughly the top 14%, bottom 35% and 6% on each side (Meta’s published margins for Reels ads), because the caption, buttons and profile overlay those areas. Check your video with the safe-zone tool, and convert landscape footage with the Reels resizer.

Sources

• Facebook Help Center and Meta Business Help Center pages on Reels and video specs (accessed October 2026).
• FB Media Tools measurements of public NASA videos, 24 October 2026, by reading the DASH manifests Facebook serves to browsers.