3:4 Aspect Ratio Calculator + Bulk Resizer
Work out any 3:4 portrait dimension, then resize or crop a whole folder of images to match — free, in your browser.
Work out any 3:4 portrait dimension, then resize or crop a whole folder of images to match — free, in your browser.
The 3:4 aspect ratio is 4:3 stood on its end — a portrait rectangle slightly less tall than 4:5. It is what most phone cameras produce when you shoot in portrait mode at their default setting, which makes it the single most common shape sitting in an unedited camera roll. It is also the native orientation of an iPad held upright.
Most phones shoot a 4:3 sensor, so held upright they hand you 3:4 — 3024x4032 on an iPhone, 3000x4000 on plenty of Android flagships. That means the 3:4 ratio in pixels is not something you convert to, it is what you started with. The work is usually going the other way: everything downstream, from Instagram at 4:5 to a 6x8 print, is a crop of this.
The default portrait output of most smartphone cameras, so it is what your camera roll is full of
iPads and most Android tablets are 3:4 when held upright
Maps cleanly onto 6x8 and 7.5x10 print sizes with no cropping
A gentler portrait crop than 4:5 when you do not want to lose the sides
3:4 is the taller of the two, which surprises people. At 1080 pixels wide, 3:4 gives you 1440 tall and 4:5 gives you 1350. So your phone actually shoots a taller frame than Instagram will display — posting a 3:4 photo means losing 90 pixels off the height somewhere.
Same proportions, opposite orientation. 4:3 is landscape (wider than tall), 3:4 is portrait (taller than wide). A 1024x768 image is 4:3; rotate it to 768x1024 and it is 3:4.
Most phone sensors are natively 4:3, inherited from compact digital cameras. Hold the phone upright and you get 3:4. Many phones now offer a 16:9 or 1:1 option, but those are crops of the same 4:3 sensor — you lose pixels choosing them.
Multiply your print size in inches by 300 for photo-quality output. A 6x8 print is 1800x2400 pixels; 7.5x10 is 2250x3000. Below about 200 DPI you start seeing softness on a held print, though wall art viewed from a distance gets away with less.
You crop the top and bottom, not the sides — about 6% of the height goes. On a batch of phone photos that is usually invisible, but watch anything shot tight where a head is near the top edge. Crop deliberately and you control which end gives; let Instagram do it and it takes from both.