1:1 Square Format

The 1:1 aspect ratio is a square: width and height are equal, so 1080 × 1080, 2048 × 2048 and 4096 × 4096 are all the same shape at different sizes. Collected here for the Playcut spec library are 18 square sizes with megapixel counts, the 11 placements and settings that still publish or apply a square spec, the crop percentages against 4:5, 3:4, 16:9 and 9:16, and the exact square outputs of the AI image models that render 1:1.

What the 1:1 aspect ratio means

The 1:1 aspect ratio is a frame whose width divided by height equals exactly 1.0, whether the frame is 320 × 320 or 4096 × 4096. It is the one ratio with no landscape or portrait version: rotate a square and it is still a square, so a single 1:1 asset fits both orientations without a second crop.

1:1

1:1, 1x1, "square" and 1.0 are the same shape

All four labels describe the same geometry: platform help pages write 1:1, camera menus write 1x1 or 1 by 1, calculators use the decimal 1.0, and most people say square. Check any candidate size by dividing width by height; the aspect ratio calculator does the same arithmetic and reduces the fraction for you.

Image aspect ratio vs pixel aspect ratio: why modern pixels are also 1:1

Two different things are called 1:1. The image aspect ratio describes the whole frame, while the pixel aspect ratio describes the shape of each pixel, and on modern displays and delivery files the pixels are square. Standard-definition video was the exception: NTSC DV stored 720 × 480 with non-square pixels that displayed as 4:3, and the 4:3 aspect ratio sheet covers both under BT.601.

1:1 in pixels: square sizes from 512 to 4096

1:1 in pixels is any width repeated as the height: 1080 × 1080 for social feeds, 1200 × 1200 for Google display ads, 3000 × 3000 for album art and 4096 × 4096 for a 4K square master. The table lists 18 sizes with their megapixel counts (width × height ÷ 1,000,000, computed) and where each one is used.

Why 1080 × 1080 became the social default

1080 became the square standard because Instagram's help centre asks for photos at least 1080 pixels wide and downscales anything wider, so a 1080-pixel square is the largest file the feed keeps at full resolution. The same width heads the 4:5 (1080 × 1350) and 9:16 (1080 × 1920) feed sizes, so one 1080-wide master recrops across all three.

1024, 2048 and 4096: the power-of-two squares of the Nano Banana models

The Nano Banana square tiers are powers of two, 1024, 2048 and 4096, rather than 1080 or 3000. Google's Gemini API pricing page lists 1024 × 1024, 2048 × 2048 and 4096 × 4096 as the 1K, 2K and 4K image sizes, and the 2.5K and 4K resolution sheet explains why 4096 counts as 4K while 3840 is UHD.

How to compute or check a square size

Divide width by height; if the answer is exactly 1, the frame is square. To scale a square, multiply one side and repeat it, so a 1080 master at 2.5× becomes 2700 × 2700; in CSS, aspect-ratio: 1 / 1 locks a box to a square at any width.

Where the square format is used

Square is a feed, ad and artwork format: Instagram still accepts 1:1 posts, Meta's Right Column placement asks for it, Google's responsive display ads want a square image, and Spotify and Apple Music require square cover art. The table lists 11 placements and settings with the sizes their published specs give.

Instagram feed and profile grid (organic)

A 1080 × 1080 post displays uncropped in the Instagram feed, because square sits inside the 1.91:1 to 3:4 range (566 to 1440 pixels tall at 1080 wide) on Instagram's photo-size help page (retrieved 2026-09-05, unlinked); 3:4 photos have been accepted as well since May 2025. The profile grid is a different surface: since early 2025 it shows 3:4 thumbnails, so a square is centre-cropped to 810 × 1080 there, losing 25% of its width total (12.5% per edge).

Ad placements that still ask for 1:1

Meta's Right Column is the Meta image placement that still specifies 1:1 alone: ratio 1:1, resolution at least 1080 × 1080, JPG or PNG, minimum 254 × 133 (per Meta's Ads Guide, retrieved 2026-09-05, unlinked). Facebook and Instagram Feed image ads, by contrast, now recommend 4:5 at 1440 × 1800 in the same guide, so 1:1 is accepted in the feed but is no longer the recommendation.

Google's responsive display ad guidance asks for a 1200 × 1200 square image and square logo alongside the 1200 × 628 landscape image, with 300 × 300 and 128 × 128 minimums. LinkedIn accepts square video from 360 × 360 to 1920 × 1920, and TikTok in-feed ads accept 1:1 from 640 × 640.

Album and podcast cover art: Spotify and Apple Music

Cover art is where square is mandatory rather than optional. Spotify's cover art requirements call for a 1:1 TIFF, PNG or JPG between 640 and 10,000 pixels per side in sRGB with no upscaling, and Apple Music's specification recommends a minimum of 3000 × 3000, so one file at 3000 or above serves both stores.

Profile pictures, avatars and the iPhone 1:1 camera setting

Avatars are square by convention, though Instagram's help centre does not list a pixel size for profile photos (checked 2026-09-05); the 320 × 320 figure in third-party guides is commonly cited, not an Instagram-published number. The iPhone Camera's Aspect options are 1:1, 4:3 and 16:9, and the square setting trims 25% of the sensor frame's width total (12.5% per edge); phone screens themselves are tall 19.5:9-class panels, tabulated on the iPhone aspect ratio sheet.

A short history of the square: 6 × 6 film to Instagram

Square predates social media by a century: the 6 × 6 cm frame on 120 roll film was the classic 1:1 format of twin-lens reflex cameras, and Instagram only allowed square uploads until 27 August 2015, when it reported that nearly one in five posts were already non-square.

120 film, twin-lens reflex cameras, Polaroid and Instax Square

Wikipedia's aspect-ratio article traces the square through medium format: 6 × 6 cm negatives on 120 film, the twin-lens reflex bodies built around them, many Polaroid instant films, and Fujifilm's Instax Square SQ10 (2017) and SQ6 (2018). Exact exposure dimensions vary by camera and film and are not quoted here.

Instagram's square-only era, 2010 to 27 August 2015

Instagram launched square-only and stayed that way for five years. Its 27 August 2015 announcement added landscape and portrait after finding that nearly one in five photos and videos people posted were not square, while keeping square as the default and the profile grid centre-cropped to 1:1.

The square profile grid, 2015 to early 2025

The grid outlived the square-only feed by almost a decade, centre-cropping every post to a square until early 2025, when it moved to 3:4 thumbnails; Kapwing's grid test (retrieved 2026-09-05, unlinked) shows every other ratio centre-cropped there, which puts a square at 810 × 1080. 3:4 photos have been accepted in the feed since May 2025, as the 3:4 aspect ratio sheet documents.

Square vs 4:5 vs 3:4: the crop math

Going from 4:5 to 1:1 removes 20% of the height total (10% per edge), from 3:4 to 1:1 removes 25% total (12.5% per edge), and the reverse crops take the same percentages off the width, so a 1080 × 1080 square becomes 864 × 1080 at 4:5 and 810 × 1080 at 3:4.

Cropping a 4:5 or 3:4 portrait down to square

Keep the width and trim the height. A 1080 × 1350 portrait loses 270 pixels, 20% total (10% per edge), and a 1080 × 1440 portrait loses 360 pixels, 25% total (12.5% per edge). If faces, logos and captions sit inside the central square at generation time, neither crop touches them; the 4:5 aspect ratio sheet covers the 4:5 frame's own safe zone.

Cropping a square out to 4:5 or 3:4

Keep the height and trim the width. 1080 × 1080 becomes 864 × 1080 at 4:5, removing 20% of the width total (10% per edge), and 810 × 1080 at 3:4, removing 25% total (12.5% per edge). Because these portrait crops are narrower than the square, a subject centred in the square survives both.

A square in the 3:4 profile grid and in the 9:16 Shorts player

Neither surface shows a square in full. The 3:4 grid centre-crops a square to 810 × 1080, and the 9:16 Shorts player letterboxes it: a 1080 × 1080 video fills 1080 of the player's 1920 rows (56.25%), leaving bars over 43.75% of the height total (21.875% per edge).

A square upload still counts as a Short under YouTube's three-minute Shorts rule, but Shorts fill the screen at 9:16, as the 9:16 resolution sheet tabulates; YouTube's other upload sizes are on the YouTube video size sheet.

Which AI models generate 1:1 natively

Each of the three image models on Playcut offers 1:1, and the Nano Banana models are the ones with published square pixel sizes: 1024 × 1024 at 1K, 2048 × 2048 at 2K and 4096 × 4096 at 4K. For video, Imagine Video (classic), Seedance 2.0, HappyHorse 1.1 and Wan 2.7 list a 1:1 setting, while Veo 3.1 and Omni Flash output 16:9 and 9:16 only.

Image: Nano Banana Pro and Nano Banana 2 at 1024, 2048 and 4096 square

Nano Banana Pro and Nano Banana 2 return true squares at the 1K, 2K and 4K tiers: 1024 × 1024, 2048 × 2048 and 4096 × 4096, matching the sizes on Google's Gemini API pricing page. Nano Banana 2 also has a 512 tier (Google lists it as 512px / 0.5K) whose 1:1 output measured 512 × 512 in Playcut's probes, a cheap draft before the 4K master in Playcut's image generator.

Image: Grok Imagine (Image) at 1K and 2K, no published pixel sizes

Grok Imagine (Image) accepts 1:1 at its 1K and 2K tiers and has no 4K tier. xAI publishes no per-ratio pixel table, so the exact square dimensions are not published; inspect the returned file rather than assuming 1024 or 2048.

Video models with a 1:1 setting, and the two without

Seedance 2.0 lists 1:1 from 480p to 4k, Imagine Video (classic) at 480p and 720p, and HappyHorse 1.1 and Wan 2.7 on their text-to-video and reference-to-video modes; the image-to-video modes of HappyHorse and Wan take no ratio parameter, and Imagine Video 1.5 is image-to-video only with 1:1 listed but unverified.

Per-ratio video pixel sizes are not published for any of them, so check the output from Playcut's video generator. Veo 3.1 and Omni Flash have no square option, so a square from either is a crop.

1:1 compared with 16:9, 9:16, 4:3 and 3:2

At 1080 pixels wide a square holds 1.17 megapixels: 43.75% less than 9:16 (2.07 MP), 20% less than 4:5 (1.46 MP) and 78% more than 16:9 (0.66 MP). Cropping 16:9 or 9:16 to square discards 43.75% of the frame total (21.875% per edge).

Height and area at 1080 pixels wide

At 1080 pixels wide the height runs from 608 (607.5 exact) for 16:9 to 1920 for 9:16, and the table gives the megapixels and the crop each shape pays to reach a square.

The wide-to-square crops cost the most: a 3:2 photo (1620 × 1080) gives up a third of its width, as the 3:2 aspect ratio sheet tabulates for camera sensors.

When to choose square over a portrait or landscape frame

Choose square when one asset must serve both orientations, when the destination requires it (cover art, Right Column, responsive display), or when a mixed carousel needs every card the same shape. Choose 4:5 or 9:16 for a phone feed that rewards height, and 16:9 for a widescreen player.