Aspect Ratios Cheat Sheet — Every Major Platform in 2026
A practical reference for every aspect ratio you'll meet across social media, video, and cinema in 2026 — with the pixel dimensions each platform actually expects, the gotchas that break content, and a one-click direct link to the free calculator pre-loaded for that ratio.
YouTube
Main feed: 16:9 (1920 × 1080 minimum, 3840 × 2160 for 4K). YouTube's player is fundamentally horizontal — anything portrait gets pillarboxed inside the 16:9 frame, leaving black or blurred bars on the sides. For best engagement, master at 4K 16:9 and let YouTube transcode down.
Shorts: 9:16 (1080 × 1920). Strict vertical. The Shorts shelf shows the bottom 75% of the title, so put your hook in the first second of audio rather than relying on text overlays at the top.
Pre-roll thumbnails: 16:9 (1280 × 720). Smaller than the player ratio but identical aspect.
→ Calculator: 16:9 reverse mode at 1920 px
TikTok
Strict 9:16 (1080 × 1920). The full-screen player crops or letterboxes anything else aggressively. Even slightly off (8.5:16, 9:15.5) is letterboxed visibly. Master at exactly 9:16 — the algorithm appears to give a small ranking boost to assets that fill the frame perfectly without bars.
TikTok Photo Mode: 9:16 for the slideshow, but the first image gets cropped to a square thumbnail in the FYP. Plan around the center 1:1 of your portrait image.
→ Calculator: 9:16 reverse mode at 1080 px
Instagram is the most fragmented platform — five aspect ratios in active use:
- Feed square: 1:1 (1080 × 1080). The legacy default; safest for cross-platform reuse since 1:1 crops fairly across both portrait and landscape sources.
- Feed portrait: 4:5 (1080 × 1350). The taller form Instagram prefers in 2026 because it occupies more pixels above the fold on phones; gets ~25% more impressions than 1:1 in Instagram's own engagement studies.
- Stories / Reels: 9:16 (1080 × 1920). Phone-native vertical.
- Link preview cards: 1.91:1 (1200 × 628). Used for shared external URLs.
- IGTV: 9:16 (1080 × 1920) for vertical, 16:9 for landscape (deprecated path).
A safe single-asset workflow: master at 4:5 (1350 px tall), crop center-square for 1:1, crop top-1080 for 9:16.
→ Calculator: 4:5 reverse mode
Twitter / X
In-feed video and link previews: 16:9 (1280 × 720 minimum). The card preview crops to 2:1 on some surfaces, so keep critical content in the central 2:1 region of a 16:9 image.
Promoted card images: 1.91:1 (1200 × 628). Identical to LinkedIn and Facebook link previews — design once, ship everywhere.
→ Calculator: 16:9 reverse mode
Shared link images: 1.91:1 (1200 × 628). Same spec as Facebook and Twitter, which makes LinkedIn unusually friendly for cross-platform reuse.
Native video: 16:9 (1920 × 1080) for landscape, 9:16 (1080 × 1920) for vertical. LinkedIn's vertical video is treated like Reels — the algorithm gives it preferential placement in 2026.
Square posts: 1:1 (1200 × 1200). LinkedIn renders square images larger than 1.91:1 in the feed, so square is often a better choice for static content.
→ Calculator: 1.91:1 → use custom 191:100
Pins: 2:3 (1000 × 1500). Pinterest's grid is column-based, and taller pins occupy more pixel real estate per scroll. Pinterest's published engagement data consistently shows 2:3 outperforming 1:1 by a meaningful margin.
Idea Pins (long-form): 9:16 (1080 × 1920).
Avoid 1:1 and 16:9 entirely on Pinterest unless you're cross-posting from Instagram. The "wider than tall" pins simply don't perform.
→ Calculator: 2:3 reverse mode
Video: 16:9 (1920 × 1080) for in-feed, 9:16 for Stories and Reels (1080 × 1920). Facebook's video engagement leans heavily toward 9:16 in 2026; the older "1:1 for sound-off" wisdom is dated.
Link preview cards: 1.91:1 (1200 × 628). Universal social card spec; works on every Open Graph-compliant platform.
→ Calculator: 9:16 reverse mode
Cinema and prestige TV
Theatrical "scope": 2.39:1 (sometimes labeled 2.40:1). Hollywood's dominant ratio for major theatrical releases since the late 1970s. Anamorphic origin, but most modern productions shoot spherical and crop in post.
Theatrical "flat": 1.85:1. The other modern cinema standard, slightly less wide. Common on independent and arthouse films, and the default on many documentaries.
Streaming prestige TV: 2.39:1. Stranger Things, House of the Dragon, the Netflix Marvel limited series, anything Apple TV+ funded — these master at theatrical 2.39:1 to signal "cinematic" production value, knowing viewers will tolerate letterboxing on a 16:9 TV.
TikTok-cinema mashups: 9:16 crop of 2.39:1. The worst possible composition (you lose 78% of horizontal information), but increasingly common as cinema content gets clipped for vertical-first platforms.
→ Calculator: 2.39:1 cinema preset
Gaming and ultrawide monitors
21:9 (3440 × 1440 / 2560 × 1080) — ultrawide gaming and productivity monitors. A few cinema films master at 21:9 specifically for ultrawide home viewing.
32:9 super-ultrawide (5120 × 1440) — high-end Samsung Odyssey and LG monitors. Not a content-creation target, but a viewing context that letterboxes everything else.
→ Calculator: 21:9 reverse mode
Email signatures and presentations
Email signature image: 4:1 (typically 600 × 150). Custom non-standard ratio designed for the narrow horizontal banner space at the bottom of an email.
16:9 presentation slides (1920 × 1080) — the default for Google Slides, Keynote, PowerPoint since the 16:9 displays became standard. 4:3 slides (1024 × 768) are still occasionally needed for legacy projectors in conference rooms built before 2015.
→ Calculator: custom ratio entry
The cheat sheet, in one table
| Platform | Best ratio | Pixel size | Notes |
|---|---|---|---|
| YouTube horizontal | 16:9 | 1920 × 1080 / 3840 × 2160 | Pillarbox vertical |
| YouTube Shorts | 9:16 | 1080 × 1920 | Hook in first second |
| TikTok | 9:16 | 1080 × 1920 | Strictly 9:16, no near-misses |
| Instagram square | 1:1 | 1080 × 1080 | Safest cross-platform |
| Instagram portrait | 4:5 | 1080 × 1350 | Best feed engagement 2026 |
| Instagram Stories | 9:16 | 1080 × 1920 | |
| Twitter/X | 16:9 | 1280 × 720 | Center 2:1 safe zone |
| 1.91:1 / 1:1 | 1200 × 628 / 1200 × 1200 | Square renders larger | |
| 2:3 | 1000 × 1500 | Avoid 1:1 and 16:9 | |
| Facebook video | 16:9 / 9:16 | 1920 × 1080 / 1080 × 1920 | Vertical preferred |
| Cinema scope | 2.39:1 | 2390 × 1000 | Anamorphic |
| Cinema flat | 1.85:1 | 1850 × 1000 | Indie / docs |
| Ultrawide gaming | 21:9 | 3440 × 1440 |
Need to convert any of these without typing? The free Screen Ruler aspect ratio calculator handles all eight common presets in two clicks, with shareable URLs that preserve exact configurations. No signup, no ads, runs in your browser.
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