Part of:Photo Print Size Chart: Inches, Pixels and DPI
Resize Image for a 4x6 Print
Resize a photo to 1200x1800 pixels, the size a 4 by 6 inch print needs at 300 DPI. Check the ratio and DPI first.
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Supported formats: JPG, PNG, WebP, AVIF, SVG
Your image is smaller than the target, so the result will be upscaled and soft. Use a higher resolution photo for a sharp output.
This page outputs exactly the target size. If your image is smaller, the file is enlarged to reach it and looks softer. Enlarging cannot recover detail that was never captured.
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A 4 by 6 inch print at 300 DPI needs exactly 1,200 by 1,800 pixels, and that number only means something if the source photo has the right shape. Most photos do not, which is why labs either crop unexpectedly or deliver a soft print. This page gives you the exact pixel target, shows what happens when the ratio does not match, and tells you when enlarging is not worth it.
How it works
Where 1200 by 1800 comes from
Print size is measured in inches, and resolution says how many pixels go in one of those inches. A 4 by 6 inch print at 300 DPI needs 4 times 300 pixels across and 6 times 300 pixels down, which is 1,200 by 1,800. The arithmetic is simple, and it also tells you what a different DPI would need, which is the number most people are actually looking for.
| Resolution | Pixels needed | Print quality |
|---|---|---|
| 150 DPI | 600 × 900 | Acceptable for casual viewing, soft up close |
| 200 DPI | 800 × 1,200 | Good for moderate prints |
| 300 DPI | 1,200 × 1,800 | Standard for sharp photographs |
| 400 DPI | 1,600 × 2,400 | Above what most viewers can resolve |
| 600 DPI | 2,400 × 3,600 | Overkill for a 4 by 6, larger file only |
NoteMore pixels than the eye can resolve does not improve a print. 300 DPI is the practical ceiling for a photo this size.
The ratio problem, which is the real one
A 4 by 6 print is a 2:3 shape. Camera photos are usually 3:2, which is the same shape turned on its side, so a landscape photo will not fit without cropping its sides. Phone photos in portrait are closer, but a 4:3 phone camera or a cropped screenshot will be further off again. Before resizing, check which of the two situations you have, because the right fitting mode depends on it.
| Source ratio | Orientation | How it fits 4x6 |
|---|---|---|
| 3:2 landscape | Wide | Slight crop of the left and right edges |
| 3:2 portrait | Tall | Close fit, minimal crop |
| 2:3 | Either | Exact match, no crop needed |
| 4:3 | Either | Noticeable crop or a border, not both equally |
| 1:1 square | Square | Large crop or a wide border |
| 16:9 widescreen | Wide | Significant crop top and bottom |
NoteCheck what gets cut before you commit. A crop that removes a face or a caption is worse than a small border.
When enlarging is the wrong answer
Resizing a small photo up to 1,200 by 1,800 produces a file with the right pixel count and none of the detail to go with it. The print is technically the right size and looks soft, which is exactly the result people are trying to avoid. The honest advice is to print smaller: a 600 by 900 photo at 150 DPI printed at 3 by 4.5 inches looks better than the same photo enlarged to 4 by 6. Check what your source can actually support with the print size calculator before resizing.
- Check the source dimensions first. Fewer than 1,200 by 1,800 means enlarging.
- If the source is well under the target, print smaller rather than enlarging.
- If the source is only slightly under, a small enlargement is often acceptable.
- Never enlarge more than about 1.5 times and expect it to look sharp.
Preparing the file for the lab
A print service mostly needs a correctly sized file with enough pixels, and it will handle the rest. What does matter is the format and the quality. JPG is what every lab expects and it keeps the file small. If your photo is already correct, resist re-compressing it aggressively, because that is a second lossy pass on data that is about to be printed and the softness will show on paper more than it does on screen.
- JPG is the safest format for a print lab. Export at balanced or high quality.
- Do not compress the file further once it is the right size. It is about to be printed, not displayed small.
- Keep the full resolution original. You may need a different size later.
- For a border or a collage, compose it first, then resize once at the end.
Batch resize photos for 4x6 prints
Resize a whole batch of photos to 1200x1800 for 4x6 printing. Free, private, and processed locally.
Frequently asked questions
How many pixels is a 4x6 print?
1,200 by 1,800 pixels at 300 DPI, which is 4 inches by 6 inches multiplied by 300 dots per inch. That is the standard for a sharp lab-quality print.
What DPI do I need for a sharp 4x6 print?
300 DPI is the safe standard for a photograph viewed in the hand. At 150 DPI the same 4 by 6 print would need only 600 by 900 pixels and looks noticeably softer at close range, which is acceptable for a casual print but not for a framed one.
My photo is not 2:3, what happens?
A 4 by 6 print is a 2:3 ratio, and most camera photos are 3:2, which is the same shape rotated. A portrait phone photo at 3:2 will need its sides cropped slightly. Choosing fill crops that overflow, while fit keeps everything and adds a border.
What if my photo is smaller than 1200x1800?
It is enlarged to reach the target so you can still order the print, and a warning appears. Enlarging adds pixels without adding detail, so the result looks softer than the original. Print smaller instead of enlarging when you can.
Can I batch resize photos for 4x6 prints?
Yes. Add a folder of photos, resize every one to 1,200 by 1,800, and download a ZIP. Everything is processed on your device.