Every form asks for the same thing in a different unit. One wants centimetres, the next wants pixels, a third just says passport size and assumes you know. They are all describing one rectangle.
Here is that rectangle, and everything that follows from it.
The Size, in Four Units
In India, a passport size photo is 35 × 45 mm. That single number is what every other version is derived from, so the four below are not four standards — they are one standard written four ways.
So the passport size photo size in cm is 3.5 × 4.5 cm — the passport size photo size in cm india works to, written plainly as passport size photo 3.5 x 4.5 or passport size photo 35mm x 45mm where a form will not take the × sign. The passport size photo size in inch is roughly 1.38 × 1.77 inches, and in pixels 413 × 531 at print resolution — the passport size photo size in pixels that every print shop works to. Give a form the passport size photo height and width in any of those units and you are describing one picture. Some portals shorten it to passport size photo cm with no unit word at all; same rectangle.
The inch figures are not round numbers because the standard was never written in inches. 35 ÷ 25.4 = 1.3780, and 45 ÷ 25.4 = 1.7717. Anything that tells you a passport size photo in inches is exactly 1.4 × 1.8 has rounded, which is fine for conversation and wrong for a print file.
The Ratio, and Why It Matters More Than the Size
The passport size photo ratio is 7:9. Divide 35 by 45 and you get 0.7778; the nearest clean whole-number ratio is 7:9, because 35 = 7 × 5 and 45 = 9 × 5.
That number does more work than the millimetres do. Millimetres tell a printer how big to print; the passport size photo aspect ratio tells you what shape to crop to. A crop at the wrong shape cannot be fixed later without either squashing the face or cutting part of it off.
7 : 9
1 : 1
5 : 7
This is also why a phone photo never fits straight away. A phone camera shoots 3:4 or 9:16; neither is 7:9. Something always has to be cropped, and the only question is whether you choose what goes or a machine does.
How Many Pixels? It Depends on DPI
Millimetres are a physical size. Pixels are not — a pixel has no size at all until you say how many go into an inch. That number is the DPI, and it is why the passport size photo dimensions in pixels question has more than one answer.
| Resolution | Pixels for 35 × 45 mm | Good for |
|---|---|---|
| 72 DPI | 99 × 128 | Nothing. Too small to print. |
| 150 DPI | 207 × 266 | Screen upload only |
| 300 DPI | 413 × 531 | Printing — the standard |
| 600 DPI | 827 × 1063 | Overkill; bigger file, no visible gain |
300 DPI is the one to use. It is what every print shop assumes, and 413 × 531 is the passport size photo resolution quoted almost everywhere. At 99 × 128 pixels a picture looks fine on a phone and comes out of a printer as a blurred smudge, because it simply does not hold enough information to fill 35 mm of paper.
Working the other way is the useful skill: take the millimetres, divide by 25.4 to get inches, multiply by 300. That is where 413 and 531 come from, and it works for any size a form throws at you.
Why Forms Also Ask for 50 KB
Here is the part that confuses people most, because it looks like a contradiction. A form asks for 413 × 531 pixels and a file under 50 KB, and those feel like opposite demands.
They are not. Pixels are how much detail the image holds. Kilobytes are how much space the file takes after compression. The same 413 × 531 photo can be 20 KB or 400 KB depending on the JPG quality setting — the picture is the same shape either way.
So if a form rejects your photo for being too large, you do not need a smaller crop. You need the same crop saved at a lower JPG quality. Dropping the pixel count as well is the mistake that turns a valid photo into a blurry one. The Passport Size Photo Maker does exactly that: it searches the quality until the file fits the cap and leaves the pixels alone.
Other Countries Are Not 35 × 45
35 × 45 mm is the standard across India, the United Kingdom, the European Schengen area, Australia and much of Asia. It is not universal, and the biggest exception is the one people trip over most.
| Where | Size | In cm | Ratio |
|---|---|---|---|
| India, UK, Schengen, Australia | 35 × 45 mm | 3.5 × 4.5 cm | 7 : 9 |
| United States, Canada visa | 2 × 2 inch (50.8 mm) | 5.08 × 5.08 cm | 1 : 1 |
| China visa | 33 × 48 mm | 3.3 × 4.8 cm | 11 : 16 |
| Stamp size (Indian forms) | 25 × 35 mm | 2.5 × 3.5 cm | 5 : 7 |
A US passport photo is square. Handing an American form a 7:9 rectangle, or an Indian form a square, gets it rejected before anyone looks at your face. Rules also change, so check the issuing authority's own page for anything that matters — a list in an article, this one included, is a starting point and not an authority.
How Many Fit on a Printed Sheet
Photo shops print onto standard paper, which is why you are handed a sheet of copies rather than one photo. The counts come straight from the arithmetic:
| Photo size | On 4 × 6 inch | On A4 |
|---|---|---|
| 35 × 45 mm | 8 copies | 36 copies |
| 2 × 2 inch | 6 copies | 20 copies |
| 25 × 35 mm | 12 copies | 64 copies |
Eight on a 4 × 6 is the familiar one, and the reason is plain once you see it in pixels: a 4 × 6 sheet at 300 DPI is 1800 × 1200, a 35 × 45 mm photo is 413 × 531, and 1800 ÷ 413 = 4 across while 1200 ÷ 531 = 2 down. Four times two is eight. The same arithmetic runs behind the sheet layouts in the photo maker, so a custom size gets a real count rather than a guess.
How Much of the Frame the Face Should Fill
The rectangle is only half the rule. Every issuing authority also states how much of it your head is supposed to occupy, and this is what gets photographs returned far more often than a millimetre or two of cropping.
The Indian guideline is that the face should cover roughly 70 to 80 per cent of the frame, measured from the chin to the crown. On a 45 mm tall photo that puts the head at about 32 to 36 mm. The US rule is written differently but means much the same thing: the head must be between 1 and 13/8 inches from chin to crown inside a 2 inch square.
| What | India (35 × 45 mm) | US (2 × 2 in) |
|---|---|---|
| Head height, chin to crown | 32—36 mm | 25—35 mm |
| Share of the frame | 70—80% | 50—69% |
| Space above the head | 2—5 mm | 3—6 mm |
| Eyes from the bottom edge | Roughly two-thirds up | 28—35 mm up |
This is why a selfie taken at arm's length rarely works even after it is cropped correctly. A phone held close exaggerates the nose and leaves the head filling almost the whole frame; step back, zoom in slightly and the proportions come out closer to what the rule wants. A photograph taken from about a metre and a half away, cropped afterwards, beats one taken from thirty centimetres every time.
Printing and Uploading Are Two Different Files
Most people need both, and the same file rarely does both jobs well.
The printed version has one requirement: enough pixels to cover the paper. At 300 DPI that is the 413 × 531 figure, and the file can be as large as it likes — nothing is checking. Save it at high JPG quality, or as PNG if you are keeping a master copy to reprint later.
The uploaded version has the opposite constraint. The portal caps the bytes, sometimes brutally, and usually says nothing about resolution beyond a minimum. Here the sensible move is to keep the same pixel dimensions and lower the JPG quality until the file fits, because a portal that accepts a 20 KB file will display it at a fraction of print size anyway.
What ruins it is using one file for both. Shrink the print copy to meet an upload cap and you have thrown away the detail you will need when you print it; keep the print copy for the upload and the form rejects it. Export twice from the same crop and both problems disappear — once at full quality for the printer, once under the portal's cap. Setting the file size limit after you have placed the face lets you do both from one crop.
- For printing: 413 × 531 pixels or larger, high quality, no byte limit, JPG or PNG.
- For uploading: the same crop, same pixels, quality lowered until it fits the cap, always JPG.
- Keep the original. Every re-save of a JPG loses a little more, so go back to the uncompressed crop each time rather than compressing an already-compressed copy.
Four Ways People Get It Wrong
- Resizing instead of cropping. Squeezing a 3:4 phone photo into a 7:9 box stretches the face. The shape has to be cut, not squashed.
- Confusing pixels with kilobytes. Shrinking the pixel count to meet a 50 KB limit throws away detail you cannot get back. Lower the JPG quality instead.
- Printing a 72 DPI file. It looks perfect on the screen it was made on and blurred on paper, because 99 × 128 pixels cannot cover 35 mm.
- Assuming one size fits every country. The US is square. That is not a detail; it is a different photo.
Quick Answers
What is the passport size photo size?
35 × 45 mm in India and most of the world — the passport size photo in cm written as 3.5 × 4.5, and the passport size photo in mm written as 35 × 45. A normal passport photo size means exactly this unless a form says otherwise.
What is the passport size photo ratio?
7:9. The passport size photo ratio in cm is identical — 3.5:4.5 reduces to 7:9 — because a ratio carries no units. A US 2 × 2 photo is 1:1 instead.
What are the passport size photo dimensions in pixels?
413 × 531 at 300 DPI. At 150 DPI it is 207 × 266, and at 72 DPI only 99 × 128. The passport size photo dimensions in cm stay 3.5 × 4.5 regardless, and the passport size photo dimensions in mm stay 35 × 45, because neither unit cares about DPI.
Passport size photo ka size kitna hota hai?
35 × 45 mm, yaani 3.5 × 4.5 cm. Printing ke liye 300 DPI par 413 × 531 pixels. Log yeh sawaal do tarah se poochte hain — passport size photo ka size kya hota hai ya kitna hota hai — jawab dono ka ek hi hai. Yehi passport size photo ka size hai jo India mein har form maangta hai.
What is the passport size photo length and width?
Width 35 mm, length 45 mm — taller than it is wide. Quote the passport size photo length and width in that order and you are right; write the passport size photo width and height the other way round, as 45 × 35, and you have described a landscape rectangle no passport office will accept.
What are the passport size photo requirements besides the size?
A plain light background, a full front-facing view, a neutral expression, both ears and the hairline visible, no shadows, and a photo taken recently. The size is the only part a tool can guarantee; the rest is judged by the person processing your application, so read the passport size photo guidelines published by your own issuing authority.
What resolution should a passport photo be?
300 DPI. Below that it prints soft; above it the file grows for no visible gain. Most portals that state a passport size photo resolution mean 413 × 531 pixels, which is 35 × 45 mm at 300 DPI.
Is 35 × 45 mm the same as 3.5 × 4.5 cm?
Yes, exactly — ten millimetres to the centimetre. Forms that ask for passport size photo 4.5 cm x 3.5 cm or 3.5 x 4.5 are asking for the identical rectangle; only the unit and the order changed.