RatioSlateClassic proportion
4:3 aspect ratio
4:3 means four units of width to three units of height, or 1.333:1. The fields open at 1600 × 1200 so the label matches the numbers.
Images are processed locally in your browser.
Direct answer
4:3 aspect ratio
4:3 is the classic display and camera proportion. It is wider than a square and shorter than 16:9. This page calculates that ratio and lists the frame sizes people still mean by it. It is not a 16:9 page with a different title.
Quick reference
| 800 × 600 | SVGA |
|---|---|
| 1024 × 768 | XGA |
| 1600 × 1200 | UXGA, the starting pair on this page |
| 2048 × 1536 | QXGA |
Platform data sources
Working presets and safe-zone guidance are checked against official platform documentation. Safe zones remain conservative guides because app UI varies.
Sizes that are actually 4:3
800 × 600, 1024 × 768, 1600 × 1200, and 2048 × 1536 all reduce to 4:3. Lock the ratio and a width of 1600 stays paired with 1200. A width of 1024 stays paired with 768. 1920 × 1080 is not on this list. That pair is 16:9, and showing it beside a 4:3 label would be the wrong frame.
Many older monitors, projectors, document cameras, and photo sensors use 4:3. A slide deck made for 4:3 will pillarbox or crop on a 16:9 television. The screen calculator is where you name a display you already measured. This page is where you build or check the 4:3 frame itself.
How 4:3 differs from 16:9 and 1:1
16:9 is a wider landscape. Moving a 4:3 photograph to 16:9 cuts the top and bottom or adds side margins. 1:1 cuts the width of a 4:3 frame until the sides match. Those are different crops. If you have the file, the image tool shows the cut. If you only have the numbers, stay here and keep the lock on so a typed width cannot drift into another ratio.
Examples
1024 × 768
The XGA frame. Divide by 256 and both sides become 4 and 3.
1600 × 1200
The pair loaded in the calculator on this URL, so the first paint matches 4:3.
Against 1920 × 1080
That Full HD frame is 16:9. Use it on the 16:9 or 1920 × 1080 page, not as a stand-in for 4:3.
Frequently asked questions
Why do the fields show 1600 × 1200?
Because 1600 × 1200 is exactly 4:3. The page does not borrow the 1920 × 1080 sample from the widescreen pages.
Is 4:3 the same family as 16:9?
No. 4:3 is 1.333:1 and 16:9 is 1.778:1. A 4:3 frame is visibly less wide.
Are my images uploaded to a server?
No. Image decoding, reframing, and export happen locally in your browser. The site does not receive your image file.
Which image formats can I use?
You can open JPG, PNG, and WebP images, then export JPG, PNG, or WebP files in supported browsers.