Aspect Ratio Guides & Platform Dimension Specs
Deep-dive technical articles, platform safe-zone diagrams, bitrate recommendations, and pre-configured standalone interactive interfaces tailored for every video and image standard.
Widescreen, Monitors & Video Interfaces (16:9, 21:9, 4:1)
16:9 Aspect Ratio Calculator & Resolution Chart
16:9 (pronounced "sixteen-by-nine" or 1.78:1) is the international standard format for HDTV, Full HD, 4K Ultra HD video, computer monitors, presentation slides, and YouTube landscape video.
1920x1080 Aspect Ratio & Scaling Calculator
A resolution of 1920 × 1080 pixels simplifies to an exact 16:9 aspect ratio with a greatest common divisor (GCD) of 120. With 2,073,600 total pixels, it is universally known as 1080p or Full HD.
21:9 Aspect Ratio Calculator & Ultrawide Cinema Guide
21:9 (technically ~64:27 or 2.37:1) is the commercial marketing term for ultrawide displays and theatrical anamorphic widescreen cinema (2.39:1). It delivers an immersive, panoramic field of view without letterboxing theatrical movies.
YouTube Aspect Ratio & Video Dimensions Guide
The standard aspect ratio for YouTube on a computer or TV is 16:9 (horizontal). For mobile-first content, YouTube Shorts uses 9:16 vertical video. YouTube's player dynamically adapts to match your upload ratio without distortion.
LinkedIn Cover Photo Aspect Ratio & Dimensions Guide
The recommended aspect ratio of a LinkedIn cover photo (background banner) is 4:1, with standard dimensions of 1584 × 396 pixels. Company pages use a 1.91:1 banner (1128 × 191 pixels).
Photography, Document & Print Standards (1:1, 4:3, 3:2, 3:4, A4, Passport)
4:3 Aspect Ratio Calculator & Dimensions Guide
The 4:3 aspect ratio (1.33:1) was the standard for 20th century television, classic cinema (Academy ratio 1.37:1), early computer monitors (VGA, XGA), Micro Four Thirds camera sensors, and modern Apple iPad screens.
3:2 Aspect Ratio Calculator & Photography Guide
The 3:2 aspect ratio (1.5:1) has been the gold standard of still photography since Oskar Barnack invented the 35mm format. It is the native sensor ratio for full-frame and APS-C mirrorless and DSLR cameras from Sony, Canon, Nikon, and Fujifilm.
1:1 Aspect Ratio Calculator & Square Resolution Guide
The 1:1 aspect ratio creates an equilateral square where width equals height. It is widely used for Instagram feed photos, profile avatars, album cover art, e-commerce catalog photography, and carousel ads.
3:4 Aspect Ratio Calculator & Portrait Dimensions
The 3:4 aspect ratio (0.75:1) is the vertical inverse of traditional 4:3. It is widely used in vertical tablet interfaces, digital magazines, Pinterest graphics, and classic portrait photography.
Aspect Ratio of A4 Size Paper & Print Dimensions
The aspect ratio of A4 size paper is 1:√2 (approximately 1:1.4142, or 210 × 297 mm). This unique mathematical ratio, defined by ISO 216, ensures that when folded in half, the sheet retains the exact same aspect ratio as A5, A3, and all A-series sizes.
Aspect Ratio of Passport Size Photo & Print Sizing Guide
The aspect ratio of a US passport size photo is 1:1 (2 × 2 inches or 51 × 51 mm, equaling 600 × 600 px at 300 DPI). UK, Schengen, Indian, and Australian passports use 35 × 45 mm, which has a 7:9 aspect ratio (approx. 413 × 531 px at 300 DPI).
Vertical & Social Video Interfaces (9:16, 4:5)
TikTok Aspect Ratio & Dimensions Guide (9:16)
The official aspect ratio for TikTok is 9:16 (vertical). The optimal upload resolution is 1080 × 1920 pixels. Uploading at this exact ratio prevents unsightly black letterboxing and accidental compression blurring by TikTok's transcoding algorithm.
Instagram Reel Aspect Ratio & Safe Zones (9:16 vs 4:5)
Instagram Reels use a 9:16 aspect ratio (1080 × 1920 pixels) in the dedicated Reels viewer. However, when viewed in the main profile feed, Instagram crops the preview to 4:5 (1080 × 1350 px), and in the profile grid it renders as 1:1 (1080 × 1080 px).
Instagram Story Aspect Ratio & Resolution (9:16)
Instagram Stories run at a 9:16 aspect ratio with standard dimensions of 1080 × 1920 pixels. Stories support static images (JPG, PNG) and short video clips up to 60 seconds.
YouTube Shorts Aspect Ratio & Size Guide (9:16)
YouTube Shorts require a vertical aspect ratio of 9:16 (1080 × 1920 pixels) or 1:1 (square, 1080 × 1080 pixels) with a duration of up to 3 minutes (180 seconds). The 9:16 format offers the highest viewer retention on mobile apps.
9:16 Aspect Ratio Calculator & Vertical Dimensions Chart
9:16 is the exact inverse of 16:9 widescreen. It is the dominant aspect ratio for smartphone content worldwide, powering TikTok, Instagram Stories & Reels, YouTube Shorts, Snapchat, and Facebook Reels.
Instagram Aspect Ratio Guide — Posts, Stories & Reels
Instagram supports multiple aspect ratios across its features: 4:5 (1080×1350 px) for portrait feed posts, 1:1 (1080×1080 px) for classic square posts, 1.91:1 (1080×566 px) for landscape images, and 9:16 (1080×1920 px) for Stories and Reels.