READY-TO-USE IMAGE TOOL
4:3 Aspect Ratio Calculator and Crop
A 4:3 aspect ratio means four units of width for every three units of height. At 1600 pixels wide, the matching height is 1200 pixels; calculate other sizes or crop your photo below.
This is an exact mathematical ratio, not a platform upload requirement. Your image stays in this browser.
Find the ratio
Enter your pixel dimensions. Whole-number dimensions reduce to an exact ratio.
Match a ratio
Set one dimension to find the other without stretching.
Matching height: 1200 px
Matching width: enter a height
Calculated values may have fractional pixels. Round to whole pixels when exporting a raster image.
Frame your image
Choose an image or drop it below. Drag the frame to position your crop; arrow keys move it too.
or drop a file here
No upload. The image never leaves your device; nothing is saved by this site.
Put this frame to work
A 1600 × 1200 photo is exactly 4:3. At 1024 pixels wide, its proportional height is 768 pixels; to crop the original to 16:9, remove 300 vertical pixels. Turn the frame upright for 3:4.
Resizing preserves a source image's shape; cropping removes edges to fit a different one. Download the crop as PNG or JPEG above.
Common 4:3 pixel sizes
| Width | Height | Pixels |
|---|---|---|
| 640 | 480 | 307,200 |
| 1024 | 768 | 786,432 |
| 1600 | 1200 | 1,920,000 |
4:3 is wider than tall. 3:4 is the same shape rotated upright; 16:9 is a wider landscape frame, so cropping a 4:3 photo to 16:9 removes top and bottom edges.
Frequently asked questions
What is 4:3 in pixels?
Any pair where width ÷ height = 4 ÷ 3: 640 × 480, 1024 × 768, 1600 × 1200. Divide both numbers by their greatest common divisor to confirm the ratio.
Is 4:3 old-fashioned?
It is the classic TV and point-and-shoot shape and still fits where a squarer frame is wanted, from slides to vintage-styled layouts. Modern widescreen video uses 16:9 instead.
What size does the 4:3 aspect ratio page start with?
The calculator and crop frame start at 1600 × 1200 pixels, which reduces to 4:3. You can type any other width and height.
Is my image uploaded anywhere?
No. The image is decoded and exported in your browser, so no image data is sent to a server.
Which image formats can I use?
Choose a PNG or JPEG image, and download the result as PNG or JPEG.
Can I crop to a different ratio?
Yes. The crop ratio menu offers 16:9, 4:3, 1:1, 9:16, 21:9 and 3:2, and the calculator accepts any width and height.