Resize image for postcard size photo

Resize any image to 4 × 6 in. Set the DPI for print. Free, private, and processed in your browser.

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4 × 6 in is a portrait 2:3 format (4 × 6 in). To print it sharply, the image needs about 1200 × 1800 pixels, which is 2.2 megapixels.

This size corresponds to 4R photo print (4 × 6 in).

Output size4 × 6 in
Matches4R photo print (4 × 6 in)
In other units10.16 × 15.24 cm / 101.6 × 152.4 mm
Aspect ratio2:3 (portrait)
Pixels at 96 DPI (Auto)384 × 576
Pixels at 300 DPI1200 × 1800 (2.2 MP)

Related guide: Image Size for Printing: DPI, Pixels and Inches Explained

4 × 6 in in pixels

Pixels = size in inches × DPI. DPI is a printing instruction, not a quality setting: it says how many pixels are spread over each inch of paper. With the DPI field on Auto, ResizeAny converts at 96 DPI, which suits screens. For print, set 300 DPI. JPG and PNG output stores the DPI value in the file.

DPIUsePixel size
72Screen preview288 × 432
96Tool default (Auto)384 × 576
150Large posters, viewed from a distance600 × 900
300Photos, cards, anything held close1200 × 1800

Will your photo be sharp enough?

A 12-megapixel phone photo (4000 × 3000) has more than the 1200 × 1800 pixels this size needs at 300 DPI, so it can be printed sharply with room left to crop.

Needed source resolution: 2.2 megapixels or more at 300 DPI.

Matching the 2:3 shape

The output is 2:3. If your photo has another shape, it has to be cropped or it will be stretched. This is how much of each common photo is lost when cropped to fill 2:3:

Starting photoCropped away to fill the shape
Phone photo (4000 × 3000, 4:3)About 50% of the image
DSLR photo (6000 × 4000, 3:2)About 56% of the image
Video frame (1920 × 1080, 16:9)About 63% of the image
Portrait phone photo (3000 × 4000, 3:4)About 11% of the image

Related presets

More in this category: Print, Paper & Photo Sizes. For several photos at once, use the bulk image resizer.

Frequently asked questions

What is 4 × 6 in in pixels?▼
It depends on DPI: 384 × 576 px at 96 DPI, 600 × 900 px at 150 DPI and 1200 × 1800 px at 300 DPI.
What is 4 × 6 in in other units?▼
4 × 6 in, 10.16 × 15.24 cm and 101.6 × 152.4 mm. It matches 4R photo print (4 × 6 in).
Is a phone photo big enough for 4 × 6 in?▼
Yes. A 12-megapixel phone photo has more than the 2.2 MP needed at 300 DPI.

Looking for a different size or format?

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