DPI is a printing and scanning number: how many pixels or dots fit into one inch. Most **digital** passport and visa uploads never mention it. They give a pixel size, a file type and a file-size limit, and that is what the upload checks. The two official pages we read that do quote a figure both say **300**, for scanning a print.
**Uploading a file:** ignore DPI, meet the pixel size, format and file size your portal states. **Scanning a 2 x 2 in US visa or DV print:** 300 pixels per inch, which gives exactly 600 x 600 pixels. **Printing at home:** no official page sets a minimum DPI; the US State Department only asks for a sharp print with no visible printer dots. **600 DPI:** not required by any page we read, and it can push a 2 x 2 scan to 1200 x 1200 pixels, outside the DV entry's exact 600 x 600.
The pages below were read on September 19, 2026.
## What DPI and PPI actually mean
Pixels per inch (PPI) says how many image pixels are laid across one inch of a printed or scanned photo. Dots per inch (DPI) is the older word for the same idea, and printer makers use it for ink dots. Two conversions cover nearly every question:
**pixels = inches x DPI** and **inches = pixels / DPI**
A file has a fixed number of pixels. The DPI value only says how big to print them. A 600 x 600 pixel image is a 2 x 2 inch photo at 300 DPI and a 1 x 1 inch photo at 600 DPI: same pixels, different paper size. That is why an online form that checks pixels has no reason to ask for DPI. Our [passport photo size in pixels](/blog/passport-photo-size-in-pixels) guide has the per-country upload specs.
## The one place DPI is official: scanning a print
The State Department's digital image page for visas says that if you scan an existing photo it must be 2 x 2 inches (51 x 51 mm) and scanned at 300 pixels per inch, or 12 pixels per millimetre. The DV-2026 entry instructions (the latest set we could read) repeat it. 2 inches x 300 = 600 pixels, so the scan lands exactly on the 600 x 600 minimum for visas and on the DV entry's required size.
The page also names the file rules the scan must still meet: square, JPEG, 24-bit color in sRGB, 240 kB or less, and a compression ratio of 20:1 or less. So DPI is only step one; see [passport photo file size](/blog/passport-photo-file-size-kb) for getting under the limit. The mismatch trap is simple. Scan at 600 ppi and you get 1200 x 1200 pixels, which the DS-160 range allows but the DV entry does not, since it asks for 600 x 600 pixels. Follow the 300 the page states.
## Worked arithmetic: printed size to pixels
These are conversions, not official requirements. Each is width x height in pixels, rounded.
| Printed size | At 300 DPI | At 600 DPI |
|---|---|---|
| 2 x 2 in (51 x 51 mm) | 600 x 600 | 1200 x 1200 |
| 35 x 45 mm | 413 x 531 | 827 x 1063 |
| 50 x 70 mm | 591 x 827 | 1181 x 1654 |
| 4 x 6 in sheet | 1200 x 1800 | 2400 x 3600 |
The sizes come from the [size of a 2x2 photo](/blog/2x2-photo-size) and the [country-by-country list](/blog/passport-photo-sizes-by-country). Notice what the table does not say: that a 35 x 45 mm print at 300 DPI is enough for the UK's digital form. It is not. GOV.UK asks for at least 600 x 750 pixels for a digital photo, and 413 x 531 falls below both. Print DPI and upload pixels are separate tests.
## What actually decides sharpness: pixels in the head
For a printed passport photo, the useful question is how many pixels cover your head. The US passport print rule puts the head at 25 to 35 mm (1 to 1 3/8 in) from chin to top of head. At 300 ppi that is about 295 to 413 pixels. The UK asks for 29 to 34 mm from crown to chin, about 343 to 402 pixels at 300 ppi. If your original shows a head at least that many pixels tall, a 300 ppi print can be sharp. If it is smaller, upscaling adds nothing.
This is why the State Department says to set your camera to its highest quality setting before you shoot, and why its online renewal page warns that scanning or photographing a print, or texting the image, can lower quality. Start from the camera original and crop last.
## Printing: what the official pages say
None of the pages we read gives a DPI to print at. The US passport page asks for a sharp photo without visible pixels or printer dots on matte or glossy photo-quality paper, and its blurry and grainy examples tell you to use better ink, paper or print settings, or "increase printer's resolution (dots per inch (DPI) setting)". That is printer output quality, and no minimum is given.
The UK asks for photos printed "to a professional standard", clear and in focus, on plain white photographic paper. HM Passport Office's guidance to its examiners (version 51.0, updated 4 March 2026) says home-printed photos are accepted only if they match booth and studio quality, and that glossy or textured paper is not accepted. So paper type can matter more than DPI, and it differs by country. ICAO's Doc 9303 points the same way: photo-quality paper, no dot patterns visible to the naked eye, and prints that still work when scanned at 300 ppi.
If you would rather not calibrate a printer, [make your photo here](/photo) and take the print sheet to a counter. For where to print, see our [print options guide](/blog/print-passport-photo-options).
## When 600 DPI does help
Higher DPI is a printer or scanner setting that can smooth fine detail, and nothing in the pages above forbids it for a print. It helps only if the source has the pixels to fill it. A 600 x 600 file printed at 600 DPI is a 1 inch photo. Printed at 2 inches, it is 300 DPI, whatever the printer dialog says.
For a DS-160 upload a 1200 x 1200 image is allowed, but the 240 kB cap bites first: a larger image needs stronger compression to fit. Aiming for 600 x 600 is the safer target, as the [DS-160 photo requirements](/blog/ds-160-photo-requirements) and [DV lottery photo rules](/blog/dv-lottery-photo-requirements) explain.
## If your photo looks blurry or grainy
Blur usually comes from focus, motion or a low-quality copy, not from the DPI tag. The State Department lists blurry, grainy and pixelated photos as unacceptable and says to check the camera is in focus. Our [blurry passport photo](/blog/blurry-passport-photo) guide goes through the causes.
## Frequently asked questions
### What DPI does a passport photo need?
None of the official pages we read sets a DPI for a digital passport photo file. They set pixel dimensions, file type and file size. DPI appears in two places only: the US visa page asks for 300 pixels per inch when you scan an existing print, and ICAO uses 300 ppi as its scanning reference for printed portraits.
### Is 300 DPI the same as 600 x 600 pixels?
For a 2 x 2 inch (51 x 51 mm) photo, yes: 2 inches at 300 pixels per inch is 600 pixels. That is why the US visa and DV pages ask for a 2 x 2 inch print scanned at 300 ppi and a 600 x 600 pixel image. The two statements describe the same file.
### Should I scan my passport photo at 600 DPI?
No, not for a US visa or DV entry. The State Department says to scan at 300 pixels per inch. A 2 x 2 inch print at 600 ppi is 1200 x 1200 pixels, which is the DS-160 ceiling but not the exact 600 x 600 the DV entry asks for.
### Why does the State Department mention DPI for printing?
In its passport photo tips, the State Department says a grainy print may need a higher printer resolution, meaning the dots per inch setting. That is printer output quality, not a number your photo file must meet. It gives no minimum. The test is a sharp print with no visible printer dots.
### Can I raise the DPI of a small photo to make it pass?
No. Changing the DPI value or enlarging the image adds no detail. If a photo is below a minimum pixel size, or looks soft, retake it at your camera's highest quality setting, as the State Department advises, instead of resizing the low-quality file.